Publications

2025

• Using the $W$ as a Standard Candle to Reach the Top: Calibrating Energy Correlator Based Top Mass Measurements
  
  • Holguin Jack
  • Moult Ian
  • Pathak Aditya
  • Procura Massimiliano
  • Schöfbeck Robert
  • Schwarz Dennis
  Physical Review Letters, American Physical Society, 2025, 134 (23), pp.368. The top quark mass plays a central role in our understanding of the Standard Model and its extrapolation to high energies. However, precision measurements of the top quark mass at hadron colliders are notoriously difficult, motivating the development of qualitatively new approaches to take advantage of the enormous datasets of top quarks at the Large Hadron Collider (LHC). Recent advances in jet substructure have enabled the precise theoretical description of angular correlations in energy flux. However, their application to precision mass measurements is less direct since they measure a dimensionless angular scale. Inspired by the use of standard candles in cosmology, we introduce a single energy correlator-based observable that reflects the characteristic angular scales of both the $W$-boson and the top quark masses. This gives direct access to the dimensionless quantity $m_{t}/m_{W}$, from which $m_{t}$ can be extracted in a well-defined short-distance mass scheme as a function of the well-known $m_{W}$ (our LHC Cepheid variable). We perform a Monte-Carlo-based study to demonstrate the properties of our observable and the statistical feasibility of its extraction from the Run 2 and 3 and High-Luminosity LHC data sets. The resulting $m_t$ has remarkably small uncertainties from non-perturbative effects and is insensitive to the parton distribution functions. We believe that our proposed observable provides a road map for a rich program to achieve a record precision top quark mass measurement at the LHC. (10.1103/j4sp-fcmd)
  DOI : 10.1103/j4sp-fcmd
• Physics case for quarkonium studies at the Electron Ion Collider
  
  • Boer Daniël
  • Flett Chris A
  • Flore Carlo
  • Kikoła Daniel
  • Lansberg Jean-Philippe
  • Nefedov Maxim
  • van Hulse Charlotte
  • Bhattacharya Shohini
  • Bor Jelle
  • Butenschoen Mathias
  • Ceccopieri Federico
  • Chen Longjie
  • Cheung Vincent
  • d'Alesio Umberto
  • Echevarria Miguel
  • Hatta Yoshitaka
  • Hyde Charles E
  • Kishore Raj
  • Kosarzewski Leszek
  • Lorcé Cédric
  • Li Wenliang
  • Li Xuan
  • Maxia Luca
  • Metz Andreas
  • Mukherjee Asmita
  • Muñoz Camacho Carlos
  • Murgia Francesco
  • Nadel-Turonski Pawel
  • Pisano Cristian
  • Qiu Jian-Wei
  • Rajesh Sangem
  • Rinaldi Matteo
  • Rittenhouse West Jennifer
  • Saleev Vladimir
  • Santiesteban Nathaly
  • Setyadi Chalis
  • Taels Pieter
  • Tu Zhoudunmin
  • Vitev Ivan
  • Vogt Ramona
  • Watanabe Kazuhiro
  • Yao Xiaojun
  • Yedelkina Yelyzaveta
  • Yoshida Shinsuke
  Prog.Part.Nucl.Phys., 2025, 142, pp.104162. The physics case for quarkonium-production studies accessible at the US Electron Ion Collider is described. (10.1016/j.ppnp.2025.104162)
  DOI : 10.1016/j.ppnp.2025.104162
• String Theory in a Pinch: Resolving the Gregory-Laflamme Singularity
  
  • Emparan Roberto
  • Sanchez-Garitaonandia Mikel
  • Tomašević Marija
  Journal of High Energy Physics, Springer, 2025, 02, pp.104. Thin enough black strings are unstable to growing ripples along their length, eventually pinching and forming a naked singularity on the horizon. We investigate how string theory can resolve this singularity. First, we study the string-scale version of the static non-uniform black strings that branch off at the instability threshold: "string-ball strings", which are linearly extended, self-gravitating configurations of string balls obtained in the Horowitz-Polchinski (HP) approach to near-Hagedorn string states. We construct non-uniform HP strings in spatial dimensions $d\leq 6$ and show that, as the inhomogeneity increases, they approach localized HP balls. By examining the thermodynamic properties of the different phases in the canonical and microcanonical ensembles, we find that, for a given mass, the uniform HP string will not evolve into a non-uniform or localized configuration. Building on these results and independent evidence from the evolution of the black string instability with $\alpha'$ corrections, we propose that string theory slows and eventually halts the pinching evolution at a classically stable stringy neck, with details depending on the dimension $d$. The system then enters a slower phase in which the neck gradually evaporates into radiation. We discuss this scenario as a framework for understanding how string theory resolves the formation of naked singularities. (10.1007/JHEP02(2025)104)
  DOI : 10.1007/JHEP02(2025)104
• Constraining Glueball Couplings
  
  • Guerrieri Andrea L
  • Hebbar Aditya
  • van Rees Balt C
  Physical Review D, American Physical Society, 2025, 112 (9), pp.094023. We set up a numerical S-matrix bootstrap problem to rigorously constrain bound state couplings given by the residues of poles in elastic amplitudes. We extract upper bounds on these couplings that follow purely from unitarity, crossing symmetry, and the Roy equations within their proven domain of validity. First we consider amplitudes with a single spin 0 or spin 2 bound state, both with or without a self-coupling. Subsequently we investigate amplitudes with the spectrum of bound states corresponding to the estimated glueball masses of pure SU(3) Yang-Mills. In the latter case the 'glue-hedron', the space of allowed couplings, provides a first-principles constraint for future lattice estimates. (10.1103/f46t-xp36)
  DOI : 10.1103/f46t-xp36
• Quark confinement from an infrared safe approach
  
  • Peláez Marcela
  • Reinosa Urko
  • Serreau Julien
  • Tissier Matthieu
  • Wschebor Nicolás
  Physical Review D, American Physical Society, 2025, 112 (9), pp.094017. We revisit the nonabelian dipole problem in the context of a simple semiclassical approach which incorporates some essential features of the infrared sector of Yang-Mills theories in the Landau gauge, in particular, the fact that the running coupling remains of moderate size at infrared scales. We obtain a simple flux-tube solution in a controlled approximation scheme, that we compare to the results of lattice simulations. (10.1103/rk6n-t66l)
  DOI : 10.1103/rk6n-t66l
• Universality of the microcanonical entropy at large spin
  
  • Pal Sridip
  • Qiao Jiaxin
  • van Rees Balt C
  Communications in Mathematical Physics, Springer Verlag, 2025, 406 (12), pp.302. We consider rigorous consequences of modular invariance for two-dimensional unitary non-rational CFTs with $c > 1$. Simple estimates for the torus partition function can lead to remarkably strong results. We show in particular that the spectral density of spin-$J$ operators must grow like $\exp\left( \pi \sqrt{\frac{2}{3}(c-1) J} \right)/\sqrt{2J}$ in any twist interval at or above $(c-1)/12$, with a known twist-dependent prefactor. This proves that the large $J$ spectrum becomes dense even without averaging over spins. For twists below $(c-1)/12$ we establish that the growth must be strictly slower. Finally, we estimate how fast the maximal gap between two spin-$J$ operators must go to zero as $J$ becomes large. (10.1007/s00220-025-05442-y)
  DOI : 10.1007/s00220-025-05442-y
• The center-symmetric Landau gauge meets the lattice
  
  • van Egmond Duifje Maria
  • Oliveira Orlando
  • Reinosa Urko
  • Serreau Julien
  • Silva Paulo J
  • Tissier Matthieu
  Physical Review D, American Physical Society, 2025, 112 (1), pp.014512. A lattice implementation of the recently introduced center-symmetric Landau gauge is discussed and its predictions confronted with numerical Monte Carlo simulations. It is shown that the link average and the link correlators computed in that gauge are order parameters of the confinement-deconfinement transition at nonzero temperature. Strictly speaking, this requires a specific treatment of the Gribov copies that we discuss in detail. The numerical simulations comply with the theoretical predictions for the link average computed below and above the deconfinement temperature. Our results show that, within appropriately chosen gauges, one can construct local order parameters for center symmetry, as proxies for the non-local Polyakov loop. (10.1103/jcmj-jng4)
  DOI : 10.1103/jcmj-jng4
• Nucleon tensor form factors at large $N_{c}$
  
  • Ghim Nam-Yong
  • Won Ho-Yeon
  • Kim June-Young
  • Kim Hyun-Chul
  Physical Review D, American Physical Society, 2025, 111 (7), pp.074024. We investigate nucleon tensor form factors in the large-$N_{c}$ limit. In this picture, the nucleon emerges as a state of the $N_c$ valence quarks, which were bound by pion mean fields that were created by the presence of the valence quarks self-consistently. We find that the tensor charge ($g^{u-d}_{T}=0.99$) and the anomalous tensor magnetic moment ($\kappa^{u+d}_{T}=7.61$) are dominated by valence quarks, while the tensor quadrupole moment ($Q^{u-d}_{T}=-7.02$) shows significant sea quark effects. We examine how these quantities vary as the average size of the pion mean field is changed, showing interpolation between non-relativistic quark and Skyrme limits. We also observe that $g^{u-d}_{T}$ and $\kappa^{u+d}_{T}$ depend weakly on the pion mass. In contrast, $Q^{u-d}_{T}$ exhibits strong enhancement near the chiral limit. The numerical results are in good agreement with available lattice QCD data and provide predictions for unmeasured quantities. (10.1103/PhysRevD.111.074024)
  DOI : 10.1103/PhysRevD.111.074024
• Mott Transition and Volume Law Entanglement with Neural Quantum States
  
  • Gauvin-Ndiaye Chloé
  • Tindall Joseph
  • Moreno Javier Robledo
  • Georges Antoine
  Physical Review Letters, American Physical Society, 2025, 134 (7), pp.076502. The interplay between delocalisation and repulsive interactions can cause electronic systems to undergo a Mott transition between a metal and an insulator. Here we use neural network hidden fermion determinantal states (HFDS) to uncover this transition in the disordered, fully-connected Hubbard model. Whilst dynamical mean-field theory (DMFT) provides exact solutions to physical observables of the model in the thermodynamic limit, our method allows us to directly access the wavefunction for finite system sizes well beyond the reach of exact diagonalisation. We directly benchmark our results against state-of-the-art calculations obtained using a Matrix Product State (MPS) ansatz. We demonstrate how HFDS is able to obtain more accurate results in the metallic regime and in the vicinity of the transition, with the volume law of entanglement exhibited by the system being prohibitive to the MPS ansatz. We use the HFDS method to calculate the amplitudes of the wavefunction, the energy and double occupancy, the quasi-particle weight and the energy gap, hence providing novel insights into this model and the nature of the transition. Our work paves the way for the study of strongly correlated electron systems with neural quantum states. (10.1103/PhysRevLett.134.076502)
  DOI : 10.1103/PhysRevLett.134.076502
• Spin-orbit correlation and spatial distributions for spin-0 hadrons
  
  • Lorcé Cédric
  • Song Qin-Tao
  Physics Letters B, Elsevier, 2025, 864, pp.139433. The spin-orbit correlation in spin-0 hadrons can be investigated through the kinetic energy-momentum tensor form factor $\tilde F^q(t)$. We observe that the latter is also related to a torque about the radial direction, which we interpret as a chiral stress. If we neglect the quark mass contribution, then $\tilde F^q(t)$ is simply proportional to the electromagnetic form factor for spin-0 hadrons, and the spin-orbit correlation is equal to minus half of the valence quark number. Given the extensive studies on the electromagnetic form factor for spin-0 hadrons such as pions, kaons, and the $\alpha$ particle, we present the spatial distributions of chiral stress and kinetic spin-orbit correlation based on current parametrizations of the pion electromagnetic form factor. (10.1016/j.physletb.2025.139433)
  DOI : 10.1016/j.physletb.2025.139433
• Probing gluonic saturation in deeply virtual meson production beyond leading power
  
  • Boussarie Renaud
  • Fucilla Michael
  • Szymanowski Lech
  • Wallon Samuel
  Physical Review Letters, American Physical Society, 2025, 134 (4), pp.041901. Exclusive diffractive meson production represents a golden channel for investigating gluonic saturation inside nucleons and nuclei. In this letter, we settle a systematic framework to deal with beyond leading power corrections at small-$x$, including the saturation regime, and obtain the $\gamma^{*} \rightarrow M (\rho, \phi, \omega)$ impact factor with both incoming photon and outgoing meson carrying arbitrary polarizations. This is of particular interest since the saturation scale at modern colliders, although entering a perturbative regime, is not large enough to prevents higher-twist effects to be sizable. (10.1103/PhysRevLett.134.041901)
  DOI : 10.1103/PhysRevLett.134.041901
• Topological Matter and Fractional Entangled Geometry
  
  • Le Hur Karyn
  Phys.Rept., 2025, 1104, pp.1-42. Here, we review our progress on a geometrical approach of quantum physics and topological crystals starting from nature, electrodynamics of planets and linking with Dirac magnetic monopoles and gauge fields. The Bloch sphere of a quantum spin-$\frac{1}{2}$ particle can also acquire an integer topological charge in the presence of a radial magnetic field. We show that the global topological properties are revealed from the poles of the surface allowing a correspondence between smooth fields, metric and quantum distance. The information is transported from each pole to the equatorial plane on a thin Dirac string. We develop the theory, "the quantum topometry" in space and time, and present applications on transport from a Newtonian approach, on a quantized photo-electric effect from circular dichroism of light towards topological band structures of crystals. The occurrence of robust edge modes related to the topological lattice models are revealed analytically when deforming the sphere or ellipse onto a cylinder. The topological properties of the quantum Hall effect, the quantum anomalous Hall effect and the quantum spin Hall effect on the honeycomb lattice can be measured locally in the Brillouin zone from the light-matter coupling. The formalism allows us to include interaction effects from the momentum space. Interactions may also result in fractional entangled geometry within the curved space. We develop a relation between entangled wavefunction in quantum mechanics, coherent superposition of geometries, a way to one-half topological numbers and Majorana fermions. We show realizations in topological matter. We present a relation between axion electrodynamics, topological insulators on a surface of a cube and the two-spheres' model via the meron.
• Theorems for the Lightcone Bootstrap
  
  • van Rees Balt C
  SciPost Physics, SciPost Foundation, 2025, 18 (6), pp.207. Consider a conformally covariant four-point function of identical scalar operators with a discrete spectrum, a twist gap, and compatible with the unitarity conditions. We give a mathematical proof confirming that the spectrum and OPE coefficients at large spin and fixed twist always become that of a generalized free field theory. (10.21468/SciPostPhys.18.6.207)
  DOI : 10.21468/SciPostPhys.18.6.207
• Can outcome communication explain Bell nonlocality?
  
  • Vieira Carlos
  • de Gois Carlos
  • Lauand Pedro
  • Antunes Porto Lucas Emanuel
  • Designolle Sébastien
  • Quintino Marco Túlio
  , 2025. A central aspect of quantum information is that correlations between spacelike separated observers sharing entangled states cannot be reproduced by local hidden variable (LHV) models, a phenomenon known as Bell nonlocality. If one wishes to explain such correlations by classical means, a natural possibility is to allow communication between the parties. In particular, LHV models augmented with two bits of classical communication can explain the correlations of any two-qubit state. Would this still hold if communication is restricted to measurement outcomes? While in certain scenarios with a finite number of inputs the answer is yes, we prove that if a model must reproduce all projective measurements, then for any qubit-qudit state the answer is no. In fact, a qubit-qudit under projective measurements admits an LHV model with outcome communication if and only if it already admits an LHV model without communication. On the other hand, we also show that when restricted sets of measurements are considered (for instance, when the qubit measurements are in the upper hemisphere of the Bloch ball), outcome communication does offer an advantage. This exemplifies that trivial properties in standard LHV scenarios, such as deterministic measurements and outcome-relabelling, play a crucial role in the outcome communication scenario. (10.48550/arXiv.2510.12886)
  DOI : 10.48550/arXiv.2510.12886
• Enhanced Strange Metallicity due to Hubbard-<math display="inline"><mi>U</mi></math> Coulomb Repulsion
  
  • Hardy Andrew
  • Parcollet Olivier
  • Georges Antoine
  • Patel Aavishkar A
  Physical Review Letters, American Physical Society, 2025, 134 (3), pp.036502. We solve a model of electrons with Hubbard-<math display="inline"><mrow><mi>U</mi></mrow></math> Coulomb repulsion and a random Yukawa coupling to a two-dimensional bosonic bath, using an extended dynamical mean field theory scheme. Our model exhibits a quantum critical point, at which the repulsive component of the electron interactions strongly enhances the effects of the quantum critical bosonic fluctuations on the electrons, leading to a breakdown of Fermi liquid physics and the formation of a strange metal with “Planckian” [<math display="inline"><mrow><mi mathvariant="script">O</mi><mo stretchy="false">(</mo><msub><mrow><mi>k</mi></mrow><mrow><mi>B</mi></mrow></msub><mi>T</mi><mo>/</mo><mi>ℏ</mi><mo stretchy="false">)</mo></mrow></math>] quasiparticle decay rates at low temperatures <math display="inline"><mi>T</mi><mo stretchy="false">→</mo><mn>0</mn></math>. Furthermore, the eventual Mott transition that occurs as the repulsion is increased seemingly bounds the maximum decay rate in the strange metal. Our results provide insight into low-temperature strange metallicity observed in proximity to a Mott transition, as is observed, for instance, in recent experiments on certain moiré materials. (10.1103/PhysRevLett.134.036502)
  DOI : 10.1103/PhysRevLett.134.036502
• Interacting topological quantum aspects with light and geometrical functions
  
  • Le Hur Karyn
  Phys.Rept., 2025, 1104, pp.1-42. I review my recent progress and develop a geometrical approach in the quantum with light as a guide, from the vector potential in classical physics, revealing that topological properties can be equivalently measured from the poles of a sphere. The topological state is induced on the Bloch sphere of a spin-1/2 particle from a radial magnetic field related to the physics of Skyrmions. This shows a relation between the global topological response being measured at the poles, the response to a circularly polarized field and the quantum metric. I show how this approach is helpful for the classification of matter with the detection of the global topological invariant at specific points in the Brillouin zone, e.g. the Dirac points, from the responses to electromagnetic waves such as circularly polarized light and from new geometrical functions associated to the quantum metric measuring the quantum Hall and spin Hall conductivities. The <math display="inline" id="d1e807" altimg="si392.svg"><mi>M</mi></math> point associated to the Brillouin zone of the honeycomb lattice also reveals the topological signature. Interactions are included in momentum space within a stochastic variational approach. In a realistic quantum model of interacting spins, this leads to fractional topological entangled aspects with a correspondence between a pair of half invariants and a Einstein–Podolsky–Rosen (EPR) pair or Bell state at one pole. I also formulate a correspondence between fractional topological numbers and resonating valence bond states. This approach gives further insight on the characterization of topological matter linked to superconductivity, protected topological semimetals in two dimensions and on the search of Majorana fermions for topologically protected quantum information. We also address a correspondence with the fractional quantum Hall effect and surface states of three-dimensional topological insulators. (10.1016/j.physrep.2024.11.003)
  DOI : 10.1016/j.physrep.2024.11.003
• One-dimensional Ising model with $1/r^{1.99}$ interaction
  
  • Benedetti Dario
  • Lauria Edoardo
  • Mazáč Dalimil
  • van Vliet Philine
  Physical Review Letters, American Physical Society, 2025, 134 (20), pp.201602. We study the 1d Ising model with long-range interactions decaying as $1/r^{1+s}$. The critical model corresponds to a family of 1d conformal field theories (CFTs) whose data depends nontrivially on $s$ in the range $1/2\leq s\leq 1$. The model is known to be described by a generalized free field with quartic interaction, which is weakly coupled near $s=1/2$ but strongly coupled near the short-range crossover at $s=1$. We propose a dual description which becomes weakly coupled at $s=1$. At $s=1$, our model becomes an exactly solvable conformal boundary condition for the 2d free scalar. We perform a number of consistency checks of our proposal and calculate the perturbative CFT data around $s=1$ analytically using both 1) our proposed field theory and 2) the analytic conformal bootstrap. Our results show complete agreement between the two methods. (10.1103/PhysRevLett.134.201602)
  DOI : 10.1103/PhysRevLett.134.201602
• Hydrodynamics of Relativistic Superheated Bubbles
  
  • Bea Yago
  • Casalderrey-Solana Jorge
  • Mateos David
  • Sanchez-Garitaonandia Mikel
  Physical Review D, American Physical Society, 2025, 112 (11), pp.114041. Relativistic, charged, superheated bubbles may play an important role in neutron star mergers if first-order phase transitions are present in the phase diagram of Quantum Chromodynamics. We describe the properties of these bubbles in the hydrodynamic regime. We find two qualitative differences with supercooled bubbles. First, the pressure inside an expanding superheated bubble can be higher or lower than the pressure outside the bubble. Second, some fluid flows develop metastable regions behind the bubble wall. We consider the possible role of a conserved charge akin to baryon number. The fluid flow profiles are unaffected by this charge if the speed of sound is constant in each phase, but they are modified for more general equations of state. We compute the efficiency factor relevant for gravitational wave production. (10.1103/65sr-b56w)
  DOI : 10.1103/65sr-b56w
• Mapping the transverse spin sum rule in position space
  
  • Lorcé Cédric
  • Mukherjee Asmita
  • Singh Ravi
  • Won Ho-Yeon
  Physics Letters B, Elsevier, 2025, 868, pp.139792. We discuss in detail the relativistic spatial distribution of transverse angular momentum, including both orbital and intrinsic spin contributions. Using the quantum phase-space formalism, we begin with the definition of the three-dimensional spatial distributions of transverse orbital angular momentum and intrinsic spin in a generic Lorentz frame. By integrating these three-dimensional spatial distributions over the longitudinal axis, we derive for the first time the relativistic spatial distributions of transverse orbital angular momentum, intrinsic spin, and total angular momentum for spin-0 and spin-1/2 targets in the transverse plane. We verify the transverse spin sum rule for spin-0 and spin-1/2 systems, and find that the transverse total angular momentum distribution is nontrivial, even for spin-0 targets. We also show how the distributions of transverse orbital angular momentum, intrinsic spin, and total angular momentum change with the target momentum. (10.1016/j.physletb.2025.139792)
  DOI : 10.1016/j.physletb.2025.139792
• Large-Scale-Structure Observables in General Relativity Validated at Second Order
  
  • Villey Antoine
  • Ginat Yonadav Barry
  • Desjacques Vincent
  • Jeong Donghui
  • Schmidt Fabian
  Journal of Cosmology and Astroparticle Physics, Institute of Physics (IOP), 2025, 10, pp.105. We present a second-order calculation of relativistic large-scale-structure observables in cosmological perturbation theory, specifically the "cosmic rulers and clock", which are the building-blocks of any other large-scale-structure observable, including galaxy number counts, on large scales. We calculate the scalar rulers (longitudinal perturbation and magnification) and the cosmic clock to second order, using a fully non-linear covariant definition of the observables. We validate our formulae on three non-trivial space-time metrics: two of them are null tests on metrics which are obtained by applying a gauge transformation to the background space-time, while the third is the "separate universe" curved background, for which we can also compute the observables exactly. We then illustrate the results by evaluating the second-order observables in a simplified symmetric setup. On large scales, they are suppressed over the linear contributions by $\sim 10^{-4}$, while they become comparable to the linear contributions on mildly non-linear scales. The results of this paper form a significant (and the most complicated) part of the relativistic galaxy number density at second order. (10.1088/1475-7516/2025/10/105)
  DOI : 10.1088/1475-7516/2025/10/105
• Influence of oxygen on electronic correlation and transport in iron in the Earth’s outer core
  
  • Blesio Germán G
  • Pourovskii Leonid V
  • Aichhorn Markus
  • Pozzo Monica
  • Alfè Dario
  • Mravlje Jernej
  Communications Earth & Environment, Springer Nature, 2025, 6 (1), pp.26. Knowing the transport properties of iron at the Earth's core conditions is essential for the geophysical modeling of Earth's magnetic field generation. Besides by extreme pressures and temperatures (which cause scattering by thermal disorder to dominate), transport may be also influenced by the presence of light elements and electron-electron scattering. We used a combination of molecular dynamics, density functional theory, and dynamical mean-field theory methods to examine the impact of oxygen impurities on the electronic correlations and transport in the Earth's liquid outer core. We find electronic correlations to be moderately enhanced by oxygen admixture. At realistic 10 atomic% of oxygen, the thermal conductivity suppression by electronic correlations (about 20%) is of the same magnitude as that due to oxygen inclusion. Hence, both play an equally important role in reducing the conductivity and stabilizing the geodynamo. We also explain the reduction of Lorenz ratio in core matter. (10.1038/s43247-024-01947-x)
  DOI : 10.1038/s43247-024-01947-x
• SIDIS at small $x$ at next-to-leading order: transverse photon
  
  • Altinoluk Tolga
  • Bergabo Filip
  • Jalilian-Marian Jamal
  • Marquet Cyrille
  • Shi Yu
  Physical Review D, American Physical Society, 2025, 112 (5), pp.054020. We calculate the next-to-leading order corrections to single inclusive hadron production in deep inelastic scattering at small $x$ using the color glass condensate formalism, for the case when the exchanged photon is transversely polarized. We show all UV and soft divergences cancel while collinear and rapidity divergences result in scale evolution of quark-hadron fragmentation function and small-x evolution of dipole amplitudes, respectively. (10.1103/s561-vqh8)
  DOI : 10.1103/s561-vqh8
• Quadrupole forces between quark/gluon subsystems inside higher-spin particles
  
  • Kim June-Young
  • Kim Hyun-Chul
  Physical Review D, American Physical Society, 2025, 112 (7), pp.074014. We generalize the mechanical interpretation of the forces between quark and gluon subsystems, previously studied for the nucleon, to arbitrary higher-spin particles. For spin-0 and spin-1/2 particles, this force is characterized by the non-conserved $\bar{c}(t)$ form factor. However, such an interpretation has not yet been established for higher-spin particles due to the intricate structure of the non-conserved energy-momentum tensor (EMT) form factors. By performing a multipole expansion, we identify the physically meaningful combinations of the non-conserved covariant EMT form factors and provide them with a clear mechanical interpretation. (10.1103/r2t1-f4mc)
  DOI : 10.1103/r2t1-f4mc
• Topological Quantum Spin Hall Semimetals with Light
  
  • Le Hur Karyn
  Physical Review B, American Physical Society, 2025, 112 (7), pp.075120. We introduce a quantum spin Hall semimetal or Fermi liquid characterized with a Z2 topological invariant, measurable through circularly polarized light. We propose its engineering through two topological metallic band structures in crystals on the honeycomb lattice, with spin-orbit interaction, realizable through the interplay of a charge or spin density wave substrate and Zeeman effects, in between a quantum spin Hall and a quantum anomalous Hall insulator. These systems show topologically protected helical edge or photo-induced currents. (10.1103/d72s-m3rk)
  DOI : 10.1103/d72s-m3rk
• Bootstrapping frustrated magnets: the fate of the chiral ${\rm O}(N)\times {\rm O}(2)$ universality class
  
  • Reehorst Marten
  • Rychkov Slava
  • Sirois Benoit
  • van Rees Balt C
  SciPost Physics, SciPost Foundation, 2025, 18 (2), pp.060. We study multiscalar theories with $\text{O}(N) \times \text{O}(2)$ symmetry. These models have a stable fixed point in $d$ dimensions if $N$ is greater than some critical value $N_c(d)$. Previous estimates of this critical value from perturbative and non-perturbative renormalization group methods have produced mutually incompatible results. We use numerical conformal bootstrap methods to constrain $N_c(d)$ for $3 \leq d &lt; 4$. Our results show that $N_c&gt; 3.78$ for $d = 3$. This favors the scenario that the physically relevant models with $N = 2,3$ in $d=3$ do not have a stable fixed point, indicating a first-order transition. Our result exemplifies how conformal windows can be rigorously constrained with modern numerical bootstrap algorithms. (10.21468/SciPostPhys.18.2.060)
  DOI : 10.21468/SciPostPhys.18.2.060