Publications

2022

Prospects for quarkonium studies at the high-luminosity LHC
- Chapon Emilien
- d'Enterria David
- Ducloue Bertrand
- Echevarria Miguel G.
- Gossiaux Pol-Bernard
- Kartvelishvili Vato
- Kasemets Tomas
- Lansberg Jean-Philippe
- Mcnulty Ronan
- Price Darren D.
- Shao Hua-Sheng
- van Hulse Charlotte
- Winn Michael
- Adam Jaroslav
- An Liupan
- Villar Denys Yen Arrebato
- Bhattacharya Shohini
- Celiberto Francesco G.
- Cheshkov Cvetan
- d'Alesio Umberto
- da Silva Cesar
- Ferreiro Elena G.
- Flett Chris A.
- Flore Carlo
- Garzelli Maria Vittoria
- Gaunt Jonathan
- He Jibo
- Makris Yiannis
- Marquet Cyrille
- Massacrier Laure
- Mehen Thomas
- Mezrag Cedric
- Micheletti Luca
- Nagar Riccardo
- Nefedov Maxim A.
- Ozcelik Melih A.
- Paul Biswarup
- Pisano Cristian
- Qiu Jian-Wei
- Rajesh Sangem
- Rinaldi Matteo
- Scarpa Florent
- Smith Maddie
- Taels Pieter
- Tee Amy
- Teryaev Oleg
- Vitev Ivan
- Watanabe Kazuhiro
- Yamanaka Nodoka
- Yao Xiaojun
- Zhang Yanxi
Prog.Part.Nucl.Phys., 2022, 122, pp.103906. Prospects for quarkonium-production studies accessible during the upcoming high-luminosity phases of the CERN Large Hadron Collider operation after 2021 are reviewed. Current experimental and theoretical open issues in the field are assessed together with the potential for future studies in quarkonium-related physics. This will be possible through the exploitation of the huge data samples to be collected in proton–proton, proton–nucleus and nucleus–nucleus collisions, both in the collider and fixed-target modes. Such investigations include, among others, those of: (i) <math display="inline" id="d1e8603" altimg="si149.svg"><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow></math> and <math display="inline" id="d1e8613" altimg="si276.svg"><mi>Υ</mi></math> produced in association with other hard particles; (ii) <math display="inline" id="d1e8618" altimg="si3.svg"><msub><mrow><mi>χ</mi></mrow><mrow><mi>c</mi><mo>,</mo><mi>b</mi></mrow></msub></math> and <math display="inline" id="d1e8633" altimg="si4.svg"><msub><mrow><mi>η</mi></mrow><mrow><mi>c</mi><mo>,</mo><mi>b</mi></mrow></msub></math> down to small transverse momenta; (iii) the constraints brought in by quarkonia on gluon PDFs, nuclear PDFs, TMDs, GPDs and GTMDs, as well as on the low-<math display="inline" id="d1e8647" altimg="si5.svg"><mi>x</mi></math> parton dynamics; (iv) the gluon Sivers effect in polarised-nucleon collisions; (v) the properties of the quark–gluon plasma produced in ultra-relativistic heavy-ion collisions and of collective partonic effects in general; and (vi) double and triple parton scatterings. (10.1016/j.ppnp.2021.103906)
DOI : 10.1016/j.ppnp.2021.103906
Deuteron relativistic charge distributions
- Lorcé Cédric
- Wang Pierre
Physical Review D, American Physical Society, 2022, 105 (9), pp.096032. We study the relativistic 2D charge distributions in the case of a spin-1 target. These charge distributions are based on a phase-space approach allowing one to study their frame dependence, and hence to relate the familiar rest-frame picture with the light-front picture developed in the last two decades. Like in the spin-<math display="inline"><mn>1</mn><mo>/</mo><mn>2</mn></math> case, we show that relativistic kinematical effects associated with spin are responsible for the distortions of the charge distributions seen in a moving frame. Applying our results to the deuteron, we observe a mild frame dependence compared to the nucleon case. (10.1103/PhysRevD.105.096032)
DOI : 10.1103/PhysRevD.105.096032
Massless Scalars and Higher-Spin BMS in Any Dimension
- Bekaert Xavier
- Oblak Blagoje
Journal of High Energy Physics, Springer, 2022, 11, pp.022. Starting from the asymptotic kinematics of massless scalar fields near null infinity in any spacetime dimension, we build two higher-spin extensions of the Carrollian definition of the BMS group and its generalisations. The first extension exhibits conformal properties reminiscent of the singleton in Anti-de Sitter space. The second acts on the space of radiative solutions of the d'Alembert equation, i.e. on Sachs's representation of BMS, which we relate to the scalar massless Poincare representation and extend to any Carrollian manifold. The corresponding enveloping algebra is a higher-spin extension of BMS that can be interpreted as the asymptotic symmetry of a putative exotic higher-spin gravity theory around Minkowski spacetime. Along the way, we provide a pedagogical introduction to Carrollian geometry and its relation to BMS. (10.1007/JHEP11(2022)022)
DOI : 10.1007/JHEP11(2022)022
Random field ϕ$^{3}$ model and Parisi-Sourlas supersymmetry
- Kaviraj Apratim
- Trevisani Emilio
Journal of High Energy Physics, Springer, 2022, 2022 (08), pp.290. We use the RG framework set up in [1] to explore the ϕ$^{3}$ theory with a random field interaction. According to the Parisi-Sourlas conjecture this theory admits a fixed point with emergent supersymmetry which is related to the pure Lee-Yang CFT in two less dimensions. We study the model using replica trick and Cardy variables in d = 8 − ϵ where the RG flow is perturbative. Allowed perturbations are singlets under the S$_{n}$ symmetry that permutes the n replicas. These are decomposed into operators with different scaling dimensions: the lowest dimensional part, ‘leader’, controls the RG flow in the IR; the other operators, ‘followers’, can be neglected. The leaders are classified into: susy-writable, susy-null and non-susy-writable according to their mixing properties. We construct low lying leaders and compute the anomalous dimensions of a number of them. We argue that there is no operator that can destabilize the SUSY RG flow in d ≤ 8. This agrees with the well known numerical result for critical exponents of Branched Polymers (which are in the same universality class as the random field ϕ$^{3}$ model) that match the ones of the pure Lee-Yang fixed point according to dimensional reduction in all 2 ≤ d ≤ 8. Hence this is a second strong check of the RG framework that was previously shown to correctly predict loss of dimensional reduction in random field Ising model. (10.1007/JHEP08(2022)290)
DOI : 10.1007/JHEP08(2022)290
Parisi-Sourlas Supersymmetry in Random Field Models
- Kaviraj Apratim
- Rychkov Slava
- Trevisani Emilio
Physical Review Letters, American Physical Society, 2022, 129 (4), pp.045701. By the Parisi-Sourlas conjecture, the critical point of a theory with random field (RF) disorder is described by a supersymmeric (SUSY) conformal field theory (CFT), related to a <math display="inline"><mi>d</mi><mo>-</mo><mn>2</mn></math> dimensional CFT without SUSY. Numerical studies indicate that this is true for the RF <math display="inline"><msup><mi>ϕ</mi><mn>3</mn></msup></math> model but not for the RF <math display="inline"><msup><mi>ϕ</mi><mn>4</mn></msup></math> model in <math display="inline"><mi>d</mi><mo><</mo><mn>5</mn></math> dimensions. Here we argue that the SUSY fixed point is not reached because of new relevant SUSY-breaking interactions. We use a perturbative renormalization group in a judiciously chosen field basis, allowing systematic exploration of the space of interactions. Our computations agree with the numerical results for both cubic and quartic potential. (10.1103/PhysRevLett.129.045701)
DOI : 10.1103/PhysRevLett.129.045701
Flat JT Gravity and the BMS-Schwarzian
- Afshar Hamid
- Oblak Blagoje
Journal of High Energy Physics, Springer, 2022, 11, pp.172. We consider Minkowskian Jackiw-Teitelboim (JT) gravity in Bondi gauge at finite temperature, with non-zero vacuum energy. Its asymptotic symmetries span an extension of the warped Virasoro group, dubbed "BMS$_2$", which we investigate in detail. In particular, we show that this extension has a single coadjoint orbit when central charges are real and non-zero. The ensuing BMS-Schwarzian action has no saddle points, and only coincides with the boundary action functional of flat JT gravity up to a crucial dilatonic zero-mode that ensures the existence of a well-defined bulk variational principle. We evaluate the corresponding gravitational partition function, which turns out to be one-loop exact precisely thanks to the presence of such a zero-mode. (10.1007/JHEP11(2022)172)
DOI : 10.1007/JHEP11(2022)172
On the hydrodynamics of (2 + 1)-dimensional strongly coupled relativistic theories in an external magnetic field
- Amoretti Andrea
- Brattan Daniel K.
Mod.Phys.Lett.A, 2022, 37 (21), pp.2230010. In this paper, we review recent progress on relativistic hydrodynamics in (2 + 1) dimensions with an external magnetic field. We discuss the formalism allowing for momentum loss due to the explicit and spontaneous breaking of translation invariance by scalar operators. We also compare to some results from the gauge/gravity correspondence. (10.1142/S0217732322300105)
DOI : 10.1142/S0217732322300105
Return-time Lq -spectrum for equilibrium states with potentials of summable variation
- Abadi M
- Amorim V
- Chazottes J.-R
- Gallo S
Ergodic Theory and Dynamical Systems, Cambridge University Press (CUP), 2022, 43 (8), pp.2489-2515. Let $(X_k)_{k\geq 0}$ be a stationary and ergodic process with joint distribution $\mu$ where the random variables $X_k$ take values in a finite set $\mathcal{A}$. Let $R_n$ be the first time this process repeats its first $n$ symbols of output. It is well-known that $\frac{1}{n}\log R_n$ converges almost surely to the entropy of the process. Refined properties of $R_n$ (large deviations, multifractality, etc) are encoded in the return-time $L^q$-spectrum defined as \[ \EuScript{R}(q)=\lim_n\frac{1}{n}\log\int R_n^q \dd\mu\quad (q\in\R) \] provided the limit exists. We consider the case where $(X_k)_{k\geq 0}$ is distributed according to the equilibrium state of a potential $\varphi:\mathcal{A}^{\N}\to\R$ with summable variation, and we prove that \[ \EuScript{R}(q) = \begin{cases} P((1-q)\varphi) & \text{for}\;\; q\geq q_\varphi^*\\ \sup_\eta \int \varphi \dd\eta & \text{for}\;\; q<q_\varphi^{*} \end{cases} \] where $P((1-q)\varphi)$ is the topological pressure of $(1-q)\varphi$, the supremum is taken over all shift-invariant measures, and $q_\varphi^*$ is the unique solution of $P((1-q)\varphi) =\sup_\eta \int \varphi \dd\eta$. Unexpectedly, this spectrum does not coincide with the $L^q$-spectrum of $\mu_\varphi$, which is $P((1-q)\varphi)$, and does not coincide with the waiting-time $L^q$-spectrum in general. In fact, the return-time $L^q$-spectrum coincides with the waiting-time $L^q$-spectrum if and only if the equilibrium state of $\varphi$ is the measure of maximal entropy. As a by-product, we also improve the large deviation asymptotics of $\frac{1}{n}\log R_n$. (10.1017/etds.2022.40)
DOI : 10.1017/etds.2022.40
Global and local topological quantized responses from geometry, light, and time
- Le Hur Karyn
Physical Review B, American Physical Society, 2022, 105 (12), pp.125106. To describe a spin-<math><mfrac><mn>1</mn><mn>2</mn></mfrac></math> particle on the Bloch sphere with a radial magnetic field and topological states of matter from the reciprocal space, we introduce <math><mi>C</mi></math> square (<math><msup><mi>C</mi><mn>2</mn></msup></math>) as a local formulation of the global topological invariant. For the Haldane model on the honeycomb lattice, this <math><msup><mi>C</mi><mn>2</mn></msup></math> can be measured from the Dirac points through circularly polarized light related to the high-symmetry <math><mi>M</mi></math> point(s). For the quantum spin Hall effect and the Kane-Mele model, the <math><msub><mi mathvariant="double-struck">Z</mi><mn>2</mn></msub></math> topological number robust to interactions can be measured locally from a correspondence between the Pfaffian and light. We address a relation with a spin pump and the quantum spin Hall conductance. The analogy between light and magnetic nuclear resonance may be applied for imaging, among other applications. (10.1103/PhysRevB.105.125106)
DOI : 10.1103/PhysRevB.105.125106
Dijet photoproduction at low $x$ at next-to-leading order and its back-to-back limit
- Taels Pieter
- Altinoluk Tolga
- Beuf Guillaume
- Marquet Cyrille
Journal of High Energy Physics, Springer, 2022, 10, pp.184. We compute the cross section for the inclusive photoproduction of a pair of jets at next-to-leading order accuracy in the Color Glass Condensate (CGC) effective theory. The aim is to study the back-to-back limit, to investigate whether transverse momentum dependent (TMD) factorization can be recovered at this order. In particular, we focus on the large Sudakov double logarithms, which are major ingredients of the TMD evolution. Interestingly, the kinematical improvement of the low-$x$ resummation scheme turns out to be a key ingredient in the analysis. (10.1007/JHEP10(2022)184)
DOI : 10.1007/JHEP10(2022)184
Gluon-mediated inclusive Deep Inelastic Scattering from Regge to Bjorken kinematics
- Boussarie Renaud
- Mehtar-Tani Yacine
Journal of High Energy Physics, Springer, 2022, 07, pp.080. We revisit high energy factorization for gluon mediated inclusive Deep Inelastic Scattering (DIS) for which we propose a new semi-classical approach that accounts systematically for the longitudinal extent of the target in contrast with the shockwave limit. In this framework, based on a partial twist expansion, we derive a factorization formula that involves a new gauge invariant unintegrated gluon distribution which depends explicitly on the Feynman x variable. It is shown that both the Regge and Bjorken limits are recovered in this approach. We reproduce in particular the full one loop inclusive DIS cross-section in the leading twist approximation and the all-twist dipole factorization formula in the strict x = 0 limit. Although quantum evolution is not discussed explicitly in this work, we argue that the proper treatment of the x dependence of the gluon distribution encompasses the kinematic constraint that must be imposed on the phase-space of gluon fluctuations in the target to ensure stability of small-x evolution. (10.1007/JHEP07(2022)080)
DOI : 10.1007/JHEP07(2022)080
Rigorous bounds on irrelevant operators in the 3d Ising model CFT
- Reehorst Marten
Journal of High Energy Physics, Springer, 2022, 09, pp.177. We use the recently developed navigator method to obtain rigorous upper and lower bounds on new OPE data in the 3d Ising CFT. For example, assuming that there are only two ℤ$_{2}$-even scalar operators ϵ and ϵ′ with a dimension below 6 we find a narrow allowed interval for ∆$_{ϵ′}$, λ$_{σσϵ′}$ and λ$_{ϵϵϵ′}$. With similar assumptions in the ℤ$_{2}$-even spin-2 and the ℤ$_{2}$-odd scalar sectors we are also able to constrain: the central charge c$_{T}$; the OPE data ∆$_{T′}$, λ$_{ϵϵT′}$ and λ$_{σσT′}$ of the second spin-2 operator; and the OPE data ∆$_{σ′}$ and λ$_{σϵσ′}$ of the second ℤ$_{2}$-odd scalar. We compare the rigorous bounds we find with estimates that have been previously obtained using the extremal functional method (EFM) and find a good match. This both validates the EFM and shows the navigator-search method to be a feasible and more rigorous alternative for estimating a large part of the low-dimensional operator spectrum. We also investigate the effect of imposing sparseness conditions on all sectors at once. We find that the island does not greatly reduce in size under these assumptions. We efficiently find islands and determine their size in high-dimensional parameter spaces (up to 13 parameters). This shows that using the navigator method the numerical conformal bootstrap is no longer constrained to the exploration of small parameter spaces. (10.1007/JHEP09(2022)177)
DOI : 10.1007/JHEP09(2022)177
Gauge invariant operators in the SU(2) Higgs model: Ward identities and renormalization
- Dudal David
- van Egmond Duifje Maria
- Justo Igor Figueiredo
- Peruzzo Giovani
- Sorella Silvio Paolo
Physical Review D, American Physical Society, 2022, 105 (6), pp.065018. The renormalization properties of two local gauge invariant composite operators <math display="inline"><mo stretchy="false">(</mo><mi>O</mi><mo>,</mo><msubsup><mi>R</mi><mi>μ</mi><mi>a</mi></msubsup><mo stretchy="false">)</mo></math> corresponding, respectively, to the gauge invariant description of the Higgs particle and of the massive gauge vector boson, are analyzed to all orders in perturbation theory by means of the algebraic renormalization in the <math display="inline"><mi>S</mi><mi>U</mi><mo stretchy="false">(</mo><mn>2</mn><mo stretchy="false">)</mo></math> Higgs model, with a single scalar in the fundamental representation, when quantized in the Landau gauge in Euclidean space-time. The present analysis generalizes earlier results presented in the case of the <math display="inline"><mi>U</mi><mo stretchy="false">(</mo><mn>1</mn><mo stretchy="false">)</mo></math> Higgs model. A powerful global Ward identity, related to an exact custodial symmetry, is derived for the first time, with deep consequences at the quantum level. In particular, the gauge invariant vector operators <math display="inline"><msubsup><mi>R</mi><mi>μ</mi><mi>a</mi></msubsup></math> turn out to be the conserved Noether currents of the above-mentioned custodial symmetry. As such, these composite operators do not renormalize, as expressed by the fact that the renormalization <math display="inline"><mi>Z</mi></math>-factors of the corresponding external sources, needed to define the operators <math display="inline"><msubsup><mi>R</mi><mi>μ</mi><mi>a</mi></msubsup></math> at the quantum level, do not receive any quantum corrections. Using this Ward identity, one can also prove that the longitudinal component of the two-point correlation function <math display="inline"><mo stretchy="false">⟨</mo><msubsup><mi>R</mi><mi>μ</mi><mi>a</mi></msubsup><mo stretchy="false">(</mo><mi>p</mi><mo stretchy="false">)</mo><msubsup><mi>R</mi><mi>ν</mi><mi>b</mi></msubsup><mo stretchy="false">(</mo><mo>-</mo><mi>p</mi><mo stretchy="false">)</mo><mo stretchy="false">⟩</mo></math> exhibits only a tree level nonvanishing contribution which, moreover, is momentum independent, thus it is not associated to any physical propagating mode. Finally, we point out that the renowned nonrenormalization theorem for the ghost-antighost-vector boson vertex in Landau gauge remains true to all orders, also in the presence of the Higgs field. (10.1103/PhysRevD.105.065018)
DOI : 10.1103/PhysRevD.105.065018
Dynamics of the $O(4)$ critical point in QCD
- Florio Adrien
- Grossi Eduardo
- Soloviev Alexander
- Teaney Derek
Physical Review D, American Physical Society, 2022, 105 (5), pp.054512. We perform a Langevin simulation of the <math display="inline"><mi>O</mi><mo stretchy="false">(</mo><mn>4</mn><mo stretchy="false">)</mo></math> critical point, which lies in the dynamic universality class of “model G.” This is the dynamic universality class of the chiral phase transition in QCD with two massless flavors. The axial charge and the order parameter <math display="inline"><msub><mi>ϕ</mi><mi>a</mi></msub><mo>=</mo><mo stretchy="false">(</mo><mi>σ</mi><mo>,</mo><mover accent="true"><mi>π</mi><mo stretchy="false">→</mo></mover><mo stretchy="false">)</mo></math> exhibit a rich dynamical interplay, which reflects the qualitative differences in the hydrodynamic effective theories above and below <math display="inline"><msub><mi>T</mi><mi>c</mi></msub></math>. From the axial charge correlators on the critical line we extract a dynamical critical exponent of <math display="inline"><mrow><mi>ζ</mi><mo>=</mo><mn>1.47</mn><mo>±</mo><mn>0.01</mn><mo stretchy="false">(</mo><mtext>stat.</mtext><mo stretchy="false">)</mo></mrow></math>, which is compatible with the theoretical expectation of <math display="inline"><mi>ζ</mi><mo>=</mo><mi>d</mi><mo>/</mo><mn>2</mn></math> (with <math display="inline"><mi>d</mi><mo>=</mo><mn>3</mn></math>) when systematic errors are taken into account. At low temperatures, we quantitatively match the <math display="inline"><mi>O</mi><mo stretchy="false">(</mo><mn>4</mn><mo stretchy="false">)</mo></math> simulations to the superfluid effective theory of soft pions. (10.1103/PhysRevD.105.054512)
DOI : 10.1103/PhysRevD.105.054512
Multiple scaling limits of $\operatorname{U}(N)^2 \times \operatorname{O}(D)$ multi-matrix models
- Benedetti Dario
- Carrozza Sylvain
- Toriumi Reiko
- Valette Guillaume
Ann.Inst.H.Poincare D Comb.Phys.Interact., 2022, 9 (2), pp.367-433. We study the double- and triple-scaling limits of a complex multi-matrix model, with U(N)2×O(D)\mathrm{U}(N)^2\times \mathrm{O}(D)U(N)2×O(D) symmetry. The double-scaling limit amounts to taking simultaneously the large-NNN (matrix size) and large-DDD (number of matrices) limits while keeping the ratio N/D=MN/\sqrt{D}=MN/D=M fixed. The triple-scaling limit consists in taking the large-MMM limit while tuning the coupling constant λ\lambdaλ to its critical value λc\lambda_cλc and keeping fixed the product M(λc−λ)αM(\lambda_c-\lambda)^\alphaM(λc−λ)α, for some value of α\alphaα that depends on the particular combinatorial restrictions imposed on the model. Our first main result is the complete recursive characterization of the Feynman graphs of arbitrary genus which survive in the double-scaling limit. Next, we classify all the dominant graphs in the triple-scaling limit, which we find to have a plane binary tree structure with decorations. Their critical behavior belongs to the universality class of branched polymers. Lastly, we classify all the dominant graphs in the triple-scaling limit under the restriction to three-edge connected (or two-particle irreducible) graphs. Their critical behavior falls in the universality class of Liouville quantum gravity (or, in other words, the Brownian sphere). (10.4171/aihpd/121)
DOI : 10.4171/aihpd/121
2D energy-momentum tensor distributions of nucleon in a large-Nc quark model from ultrarelativistic to nonrelativistic limit
- Lorcé Cédric
- Schweitzer Peter
- Tezgin Kemal
Physical Review D, American Physical Society, 2022, 106 (1), pp.014012. Form factors of the energy-momentum tensor (EMT) can be interpreted in certain frames in terms of spatial distributions of energy, stress, linear and angular momentum, based on 2D or 3D Fourier transforms. This interpretation is in general subject to “relativistic recoil corrections,” except when the nucleon moves at the speed of light like e.g. in the infinite-momentum frame. We show that it is possible to formulate a large-<math display="inline"><msub><mi>N</mi><mi>c</mi></msub></math> limit in which the probabilistic interpretation of the nucleon EMT distributions holds also in other frames. We use the bag model formulated in the large-<math display="inline"><msub><mi>N</mi><mi>c</mi></msub></math> limit as an internally consistent quark model framework to visualize the information content associated with the 2D EMT distributions. In order to provide more intuition, we present results in the physical situation and in three different limits: by considering a heavy-quark limit, a large system-size limit and a constituent-quark limit. The visualizations of the distributions in these extreme limits will help to interpret the results from experiments, lattice QCD, and other models or effective theories. (10.1103/PhysRevD.106.014012)
DOI : 10.1103/PhysRevD.106.014012
Signature of the Gluon Orbital Angular Momentum
- Bhattacharya Shohini
- Boussarie Renaud
- Hatta Yoshitaka
Physical Review Letters, American Physical Society, 2022, 128 (18), pp.182002. We propose a novel observable for the experimental detection of the gluon orbital angular momentum (OAM) that constitutes the proton spin sum rule. We consider longitudinal double spin asymmetry in exclusive dijet production in electron-proton scattering and demonstrate that the <math display="inline"><mi>cos</mi><mi>ϕ</mi></math> azimuthal angle correlation between the scattered electron and proton is a sensitive probe of the gluon OAM at small <math display="inline"><mi>x</mi></math> and its interplay with the gluon helicity. We also present a numerical estimate of the cross section for the kinematics of the Electron-Ion Collider. (10.1103/PhysRevLett.128.182002)
DOI : 10.1103/PhysRevLett.128.182002
Science Requirements and Detector Concepts for the Electron-Ion Collider: EIC Yellow Report
- Khalek R. Abdul
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- Adam J.
- Adamiak D.
- Akers W.
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- Ameli F.
- Antonioli P.
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- Armstrong W. R.
- Arratia M.
- Arrington J.
- Asaturyan A.
- Asai M.
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- Aune S.
- Avagyan H.
- Ayerbe Gayoso C.
- Azmoun B.
- Bacchetta A.
- Baker M. D.
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- Barion L.
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- Battaglieri M.
- Bazilevsky A.
- Behera N. K.
- Benmokhtar F.
- Berdnikov V. V.
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- Boer D.
- Boglione M.
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- Bossù F.
- Bozzi G.
- Brandenburg J. D.
- Brei N.
- Bressan A.
- Brooks W. K.
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- Deshpande A.
- Detmold W.
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- Diefenthaler M.
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- Dumitru A.
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- Echevarria M. G.
- El Fassi L.
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- Ent R.
- Esha R.
- Ethier J. J.
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- Gaskell D.
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- Girod F. -X.
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- Goncalves V. P.
- Gonella L.
- Gonzalez Hernandez J. O.
- Goto Y.
- Grancagnolo F.
- Greiner L. C.
- Guryn W.
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- Hatta Y.
- Hattawy M.
- Hauenstein F.
- He X.
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- Hen O.
- Heyes G.
- Higinbotham D. W.
- Hiller Blin A. N.
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- Hohlmann M.
- Horn T.
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- Huang J.
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- Huber G. M.
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- Iakovidis G.
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- Jacak B. V.
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Nuclear Physics A, North-Holland ; Elsevier [1967-....], 2022, 1026, pp.122447. This report describes the physics case, the resulting detector requirements, and the evolving detector concepts for the experimental program at the Electron-Ion Collider (EIC). The EIC will be a powerful new high-luminosity facility in the United States with the capability to collide high-energy electron beams with high-energy proton and ion beams, providing access to those regions in the nucleon and nuclei where their structure is dominated by gluons. Moreover, polarized beams in the EIC will give unprecedented access to the spatial and spin structure of the proton, neutron, and light ions. The studies leading to this document were commissioned and organized by the EIC User Group with the objective of advancing the state and detail of the physics program and developing detector concepts that meet the emerging requirements in preparation for the realization of the EIC. The effort aims to provide the basis for further development of concepts for experimental equipment best suited for the science needs, including the importance of two complementary detectors and interaction regions. This report consists of three volumes. Volume I is an executive summary of our findings and developed concepts. In Volume II we describe studies of a wide range of physics measurements and the emerging requirements on detector acceptance and performance. Volume III discusses general-purpose detector concepts and the underlying technologies to meet the physics requirements. These considerations will form the basis for a world-class experimental program that aims to increase our understanding of the fundamental structure of all visible matter (10.1016/j.nuclphysa.2022.122447)
DOI : 10.1016/j.nuclphysa.2022.122447
Signatures of the Yang-Mills deconfinement transition from the gluon two-point correlator
- van Egmond Duifje Maria
- Reinosa Urko
Physical Review D, American Physical Society, 2022, 106 (7), pp.074005. We evaluate the longitudinal or (chromo-)electric Yang-Mills gluon propagator in the recently proposed center-symmetric Landau gauge at finite temperature [D. M. van Egmond , SciPost Phys. 12, 087 (2022).]. To model the effect of the Gribov copies in the infrared, we use the Curci-Ferrari model which, in turn, allows us to rely on perturbative calculations. At one-loop order in the SU(2) case, the so-obtained longitudinal gluon propagator provides a clear signature for <math display="inline"><msub><mi>Z</mi><mn>2</mn></msub></math> center-symmetry breaking with a singular behavior, characteristic of a continuous phase transition. This is in sharp contrast with what is found within the standard Landau gauge. We also identify various signatures for <math display="inline"><msub><mi>Z</mi><mn>3</mn></msub></math> center-symmetry breaking in the SU(3) case in the form of genuine order parameters. Among those, we find that the gluon propagator, although degenerate along the diagonal color directions in the confining phase, becomes nondegenerate in the deconfined phase. Our results open new ways of identifying the transition from correlation functions both within continuum approaches and on the lattice. (10.1103/PhysRevD.106.074005)
DOI : 10.1103/PhysRevD.106.074005
The SAGEX Review on Scattering Amplitudes, Chapter 11: Soft Theorems and Celestial Amplitudes
- Mcloughlin Tristan
- Puhm Andrea
- Raclariu Ana-Maria
Journal of Physics A: Mathematical and Theoretical, IOP Publishing, 2022, 55 (44), pp.443012. The soft limits of scattering amplitudes have been extensively studied due to their essential role in the computation of physical observables in collider physics. The universal factorisation that occurs in these kinematic limits has been shown to be related to conservation laws associated with asymptotic, or large, gauge symmetries. This connection has led to a deeper understanding of the symmetries of gauge and gravitational theories and to a reformulation of scattering amplitudes in a basis of boost eigenstates which makes manifest the two-dimensional global conformal symmetry of the celestial sphere. The recast, or celestial, amplitudes possess many of the properties of conformal field theory correlation functions which has suggested a path towards a holographic description of asymptotically flat spacetimes. In this review we consider these interconnected developments in our understanding of soft theorems, asymptotic symmetries and conformal field theory with a focus on the structure and symmetries of the celestial amplitudes and their holographic interpretation. (10.1088/1751-8121/ac9a40)
DOI : 10.1088/1751-8121/ac9a40
Result of the MICROSCOPE weak equivalence principle test
- Touboul Pierre
- Métris Gilles
- Rodrigues Manuel
- Bergé Joel
- Robert Alain
- Baghi Quentin
- André Yves
- Bedouet Judicael
- Boulanger Damien
- Bremer Stefanie
- Carle Patrice
- Chhun Ratana
- Christophe Bruno
- Cipolla Valerio
- Damour Thibault
- Danto Pascale
- Demange Louis
- Dittus Hansjoerg
- Dhuicque Océane
- Fayet Pierre
- Foulon Bernard
- Guidotti Pierre-Yves
- Hagedorn Daniel
- Hardy Emilie
- Huynh Phuong-Anh
- Kayser Patrick
- Lala Stephanie
- Lämmerzahl Claus
- Lebat Vincent
- Liorzou Françoise
- List Meike
- Löffler Frank
- Panet Isabelle
- Pernot-Borràs Martin
- Perraud Laurent
- Pires Sandrine
- Pouilloux Benjamin
- Prieur Pascal
- Rebray Alexandre
- Reynaud Serge
- Rievers Benny
- Selig Hanns
- Serron Laura
- Sumner Timothy
- Tanguy Nicolas
- Torresi Patrizia
- Visser Pieter
Classical and Quantum Gravity, IOP Publishing, 2022, 39 (20), pp.204009. The space mission MICROSCOPE dedicated to the test of the equivalence principle (EP) operated from April 25, 2016 until the deactivation of the satellite on October 16, 2018. In this analysis we compare the free-fall accelerations (a$_{A}$ and a$_{B}$) of two test masses in terms of the Eötvös parameter . No EP violation has been detected for two test masses, made from platinum and titanium alloys, in a sequence of 19 segments lasting from 13 to 198 h down to the limit of the statistical error which is smaller than 10$^{−14}$ for η(Ti, Pt). Accumulating data from all segments leads to η(Ti, Pt) = [−1.5 ± 2.3 (stat) ± 1.5 (syst)] × 10$^{−15}$ showing no EP violation at the level of 2.7 × 10$^{−15}$ if we combine stochastic and systematic errors quadratically. This represents an improvement of almost two orders of magnitude with respect to the previous best such test performed by the Eöt-Wash group. The reliability of this limit has been verified by comparing the free falls of two test masses of the same composition (platinum) leading to a null Eötvös parameter with a statistical uncertainty of 1.1 × 10$^{−15}$. (10.1088/1361-6382/ac84be)
DOI : 10.1088/1361-6382/ac84be
Nonlinear Propagation and Filamentation on 100 Meter Air Path of Femtosecond Beam Partitioned by Wire Mesh
- Geints Yuri E
- Minina Olga V
- Geints Ilia Yu
- Seleznev Leonid V
- Pushkarev Dmitrii V
- Mokrousova Daria V
- Rizaev Georgy E
- Shipilo Daniil E
- Nikolaeva Irina A
- Kurilova Maria V
- Panov Nikolay A
- Kosareva Olga G
- Houard Aurélien
- Couairon Arnaud
- Ionin Andrey A
- Liu Weiwei
Sensors, MDPI, 2022, 22 (17), pp.6322. High-intensity (∼1 TW/cm2 and higher) region formed in the propagation of ∼60 GW, 90 fs Ti:Sapphire laser pulse on a ∼100 m path in air spans for several tens of meters and includes a plasma filament and a postfilament light channel. The intensity in this extended region is high enough to generate an infrared supercontinuum wing and to initiate laser-induced discharge in the gap between the electrodes. In the experiment and simulations, we delay the high-intensity region along the propagation direction by inserting metal-wire meshes with square cells at the laser system output. We identify the presence of a high-intensity region from the clean-spatial-mode distributions, appearance of the infrared supercontinuum wing, and occurrence of the laser-induced discharge. In the case of free propagation (without any meshes), the onset of the high-intensity zone is at 40–52 m from the laser system output with ∼30 m extension. Insertion of the mesh with 3 mm cells delays the beginning of the high-intensity region to 49–68 m with the same ∼30 m extension. A decrease in the cell size to 1 mm leads to both delay and shrinking of the high-intensity zone to 71–73 m and 6 m, respectively. Three-dimensional simulations in space confirm the mesh-induced delay of the high-intensity zone as the cell size decreases. (10.3390/s22176322)
DOI : 10.3390/s22176322
New horizons for fundamental physics with LISA
- Arun K.G.
- Belgacem Enis
- Benkel Robert
- Bernard Laura
- Berti Emanuele
- Bertone Gianfranco
- Besancon Marc
- Blas Diego
- Böhmer Christian G.
- Brito Richard
- Calcagni Gianluca
- Cardenas-Avendaño Alejandro
- Clough Katy
- Crisostomi Marco
- de Luca Valerio
- Doneva Daniela
- Escoffier Stephanie
- Ezquiaga Jose Maria
- Ferreira Pedro G.
- Fleury Pierre
- Foffa Stefano
- Franciolini Gabriele
- Frusciante Noemi
- García-Bellido Juan
- Herdeiro Carlos
- Hertog Thomas
- Hinderer Tanja
- Jetzer Philippe
- Lombriser Lucas
- Maggio Elisa
- Maggiore Michele
- Mancarella Michele
- Maselli Andrea
- Nampalliwar Sourabh
- Nichols David
- Okounkova Maria
- Pani Paolo
- Paschalidis Vasileios
- Raccanelli Alvise
- Randall Lisa
- Renaux-Petel Sébastien
- Riotto Antonio
- Ruiz Milton
- Saffer Alexander
- Sakellariadou Mairi
- Saltas Ippocratis D.
- Sathyaprakash B.S.
- Shao Lijing
- Sopuerta Carlos F.
- Sotiriou Thomas P.
- Stergioulas Nikolaos
- Tamanini Nicola
- Vernizzi Filippo
- Witek Helvi
- Wu Kinwah
- Yagi Kent
- Yazadjiev Stoytcho
- Yunes Nicolas
- Zilhao Miguel
- Afshordi Niayesh
- Angonin Marie-Christine
- Baibhav Vishal
- Barausse Enrico
- Barreiro Tiago
- Bartolo Nicola
- Bellomo Nicola
- Ben-Dayan Ido
- Bergshoeff Eric A.
- Bernuzzi Sebastiano
- Bertacca Daniele
- Bhagwat Swetha
- Bonga Béatrice
- Burko Lior M.
- Compere Geoffrey
- Cusin Giulia
- da Silva Antonio
- Das Saurya
- de Rham Claudia
- Destounis Kyriakos
- Dimastrogiovanni Ema
- Duque Francisco
- Easther Richard
- Farmer Hontas
- Fasiello Matteo
- Fisenko Stanislav
- Fransen Kwinten
- Frauendiener Jörg
- Gair Jonathan
- Gergely Laszlo Arpad
- Gerosa Davide
- Gualtieri Leonardo
- Han Wen-Biao
- Hees Aurelien
- Helfer Thomas
- Hennig Jörg
- Jenkins Alexander C.
- Kajfasz Eric
- Kaloper Nemanja
- Karas Vladimir
- Kavanagh Bradley J.
- Klioner Sergei A.
- Koushiappas Savvas M.
- Lagos Macarena
- Poncin-Lafitte Le Christophe
- Lobo Francisco S.N.
- Markakis Charalampos
- Martin-Moruno Prado
- Martins C.J. A.P.
- Matarrese Sabino
- Mayerson Daniel R.
- Mimoso José P.
- Noller Johannes
- Nunes Nelson J.
- Oliveri Roberto
- Orlando Giorgio
- Pappas George
- Pikovski Igor
- Pilo Luigi
- Podolsky Jiri
- Pratten Geraint
- Prokopec Tomislav
- Qi Hong
- Rastgoo Saeed
- Ricciardone Angelo
- Rollo Rocco
- Rubiera-Garcia Diego
- Sergijenko Olga
- Shapiro Stuart
- Shoemaker Deirdre
- Spallicci Alessandro
- Stashko Oleksandr
- Stein Leo C.
- Tasinato Gianmassimo
- Tolley Andrew J.
- Vagenas Elias C.
- Vandoren Stefan
- Vernieri Daniele
- Vicente Rodrigo
- Wiseman Toby
- Zhdanov Valery I.
- Zumalacárregui Miguel
Living Rev.Rel., 2022, 25 (1), pp.4. The Laser Interferometer Space Antenna (LISA) has the potential to reveal wonders about the fundamental theory of nature at play in the extreme gravity regime, where the gravitational interaction is both strong and dynamical. In this white paper, the Fundamental Physics Working Group of the LISA Consortium summarizes the current topics in fundamental physics where LISA observations of gravitational waves can be expected to provide key input. We provide the briefest of reviews to then delineate avenues for future research directions and to discuss connections between this working group, other working groups and the consortium work package teams. These connections must be developed for LISA to live up to its science potential in these areas. (10.1007/s41114-022-00036-9)
DOI : 10.1007/s41114-022-00036-9
HiRISE - High-Resolution Imaging and Spectroscopy Explorer - Ultrahigh resolution, interferometric and external occulting coronagraphic science
- Erdélyi Robertus
- Damé Luc
- Fludra Andrzej
- Mathioudakis Mihalis
- Amari T.
- Belucz B.
- Berrilli F.
- Bogachev S.
- Bolsée D.
- Bothmer V.
- Brun S.
- Dewitte S.
- Dudok de Wit Thierry
- Faurobert M.
- Gizon L.
- Gyenge N.
- Korsós M.
- Labrosse N.
- Matthews S.
- Meftah Mustapha
- Morgan H.
- Pallé P.
- Rochus P.
- Rozanov E.
- Schmieder B.
- Tsinganos K.
- Verwichte E.
- Zharkov S.
- Zuccarello F.
- Wimmer-Schweingruber R.
Experimental Astronomy, Springer Link, 2022, 54, pp.227-256. Recent solar physics missions have shown the definite role of waves and magnetic fields deep in the inner corona, at the chromosphere-corona interface, where dramatic and physically dominant changes occur. HiRISE (High Resolution Imaging and Spectroscopy Explorer), the ambitious new generation ultra-high resolution, interferometric, and coronagraphic, solar physics mission, proposed in response to the ESA Voyage 2050 Call, would address these issues and provide the best-ever and most complete solar observatory, capable of ultra-high spatial, spectral, and temporal resolution observations of the solar atmosphere, from the photosphere to the corona, and of new insights of the solar interior from the core to the photosphere. HiRISE, at the L1 Lagrangian point, would provide meter class FUV imaging and spectroimaging, EUV and XUV imaging and spectroscopy, magnetic fields measurements, and ambitious and comprehensive coronagraphy by a remote external occulter (two satellites formation flying 375 m apart, with a coronagraph on a chaser satellite). This major and state-of-the-art payload would allow us to characterize temperatures, densities, and velocities in the solar upper chromosphere, transition zone, and inner corona with, in particular, 2D very high resolution multi-spectral imaging-spectroscopy, and, direct coronal magnetic field measurement, thus providing a unique set of tools to understand the structure and onset of coronal heating. HiRISE's objectives are natural complements to the Parker Solar Probe and Solar Orbiter-type missions. We present the science case for HiRISE which will address: i) the fine structure of the chromosphere-corona interface by 2D spectroscopy in FUV at very high resolution; ii) coronal heating roots in the inner corona by ambitious externally-occulted coronagraphy; iii) resolved and global helioseismology thanks to continuity and stability of observing at the L1 Lagrange point; and iv) solar variability and space climate with, in addition, a global comprehensive view of UV variability. (10.1007/s10686-022-09831-2)
DOI : 10.1007/s10686-022-09831-2
Record statistics for random walks and L\'evy flights with resetting
- Majumdar Satya N.
- Mounaix Philippe
- Sabhapandit Sanjib
- Schehr Gregory
Journal of Physics A: Mathematical and Theoretical, IOP Publishing, 2022. We compute exactly the mean number of records $\langle R_N \rangle$ for a time-series of size $N$ whose entries represent the positions of a discrete time random walker on the line. At each time step, the walker jumps by a length $\eta$ drawn independently from a symmetric and continuous distribution $f(\eta)$ with probability $1-r$ (with $0\leq r < 1$) and with the complementary probability $r$ it resets to its starting point $x=0$. This is an exactly solvable example of a weakly correlated time-series that interpolates between a strongly correlated random walk series (for $r=0$) and an uncorrelated time-series (for $(1-r) \ll 1$). Remarkably, we found that for every fixed $r \in [0,1[$ and any $N$, the mean number of records $\langle R_N \rangle$ is completely universal, i.e., independent of the jump distribution $f(\eta)$. In particular, for large $N$, we show that $\langle R_N \rangle$ grows very slowly with increasing $N$ as $\langle R_N \rangle \approx (1/\sqrt{r})\, \ln N$ for $0<r <1$. We also computed the exact universal crossover scaling functions for $\langle R_N \rangle$ in the two limits $r \to 0$ and $r \to 1$. Our analytical predictions are in excellent agreement with numerical simulations. (10.1088/1751-8121/ac3fc1)
DOI : 10.1088/1751-8121/ac3fc1

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