Tue·Feb 20, 2024Tuesday·February 20, 2024

1. 01*

   95 GeV light Higgs in the top-pair-associated diphoton channel at the LHC in the minimal dilaton model

   Kun Wang🇨🇳 · Jingya Zhu🇨🇳

   Motivated by experimental hints and theoretical frameworks indicating the existence of an extended Higgs sector, we explore the feasibility of detecting a 95 GeV light Higgs boson decaying into a diphoton within the minimal dilaton model at the 14 TeV LHC. Initially, we identify the correlations between the production cross section, decay branching ratios, and model parameters, e.g., the scalar mixing angle $\sin {\theta }_S$. Subsequently, we utilize Monte Carlo simulations to generate the signal of the light Higgs boson via the $pp\to t\bar{t}(s\to \gamma \gamma )$ process, along with the corresponding backgrounds. To effectively separate the signal from the dominant backgrounds $tt\gamma \gamma$, we employ a meticulous cut-based selection process. Ultimately, we find that with an integrated luminosity of $L=3000{\mathrm{fb}}^{-1}$, the regions of $|\sin {\theta }_S|>0.2$ can be covered over the $3\sigma$ level.

   hep-phCPC(2024)·22 citations
2. 02*

   Search for charged lepton flavor violation of vector mesons in the $\mathrm{U}(1{)}_X\mathrm{SSM}$

   Xing-Xing Dong🇨🇳 · Shu-Min Zhao🇨🇳 · Jia-Peng Huo🇨🇳 · Tong-Tong Wang · Yi-Tong Wang · Tai-Fu Feng🇨🇳

   Charged lepton flavor violation (CLFV) represents a clear new physics (NP) signal beyond the standard model (SM). In this work, we investigate the CLFV decays of vector mesons $V\to l_i^{\pm }{l}_j^{\mp }$ with $V\in \{\varphi ,J/\Psi ,{\rm Y}(1S),{\rm Y}(2S),{\rm Y}(3S)\}$ in the $\mathrm{U}(1{)}_X\mathrm{SSM}$. Considering the SM-like Higgs boson mass within $3\sigma$ region, we discuss the corresponding constraints on the relevant parameter space of the model, which indicate this model can produce significant contributions to such CLFV decays. From the numerical analyses, the main sensitive parameters and CLFV sources originate from the non-diagonal elements correspond to the initial and final generations of the leptons. And the branching ratios to these CLFV processes can easily reach the present experimental upper bounds. Therefore, searching for CLFV processes of vector mesons may be an effective channel to study new physics.

   hep-phJ.Phys.G(2025)·1 citation
3. 03*

   Unitarity effects in elastic scattering at the LHC

   M. Maneyro🇺🇾 · E.G.S. Luna🇧🇷 · M. Peláez🇺🇾

   We study the high-energy behavior of the elastic scattering amplitude using two distinct unitarization schemes: the eikonal and the $U$-matrix. Our analysis begins with a formalism involving solely Pomerons, incorporating pion-loop insertions in the Pomeron trajectory representing the nearest singularity generated by $t$-channel unitarity. Subsequently, we explore a scenario that includes the presence of an Odderon. In our analyses, we explore the tension between the TOTEM and the ATLAS measurements for ${\sigma }_{tot}$ and $d\sigma /dt$ at 7, 8, and 13 TeV, and the subsequent implications for the properties of both the Pomeron and Odderon. Our results show that the Odderon phase factor ${\xi }_{\mathbb{O}}=-1$ is favored in both unitarization schemes, supporting an Odderon with a phase opposite to that of other crossing-odd components of the scattering amplitude. More interestingly, this specific phase factor stands as the sole one that aligns with results consistent with a non-zero Odderon coupling.

   hep-phhep-exhep-thPRD(2024)·5 citations
4. 04*

   Comments on "Can quantum statistics help distinguish Dirac from Majorana neutrinos?" (arXiv:2402.05172 [hep-ph])

   C. S. Kim · M. V. N. Murthy🇮🇳 · Dibyakrupa Sahoo🇵🇱

   In a recent article arXiv:2402.05172 [hep-ph], the authors discuss the question "whether quantum statistics can help distinguish between Dirac and Majorana neutrinos." The paper contains, among other things, an unsubstantiated critique of the results derived in our papers arXiv:2106.11785 [hep-ph] and arXiv:2307.05654 [hep-ph]. One of the criticisms is related to our expression for differential decay rate for the back-to-back neutrino-antineutrino configuration in the decay $B^0\to {\mu }^{-}{\mu }^{+}{\nu }_{\mu }{\overline{\nu }}_{\mu }$. We show that the claim is wrong and point out how the correct result was obtained. The second criticism is related to the implementation of the anti-symmetrization as dictated by quantum statistics for Majorana neutrinos and antineutrinos (which are identical, by definition). Any direct observation of the neutrinos, as done in Ref. \cite{Akhmedov:2024}, would project the neutrinos into distinguishable helicity states, thus nullifying all observable effects of quantum statistics. They have missed the point that our procedure holds when the neutrino and antineutrino remain undetected by the detector. In the back-to-back kinematic configuration, one can infer the neutrino energies without directly detecting their identities. This smartly ensures that the quantum statistical effects are not erased. Their overriding assertion that our papers arXiv:2106.11785 [hep-ph] and arXiv:2307.05654 [hep-ph] are incorrect fails to recognize that in both arXiv:2106.11785 [hep-ph] and arXiv:2307.05654 [hep-ph] we also point out generic conditions under which the practical Dirac-Majorana confusion theorem holds. "Clearly there is no confusion over confusion theorem."

   hep-ph1 citation
5. 05*

   Higgs-strahlung at the LHC in the inert doublet model

   Dazhuang He🇨🇳 · Yu Zhang🇨🇳 · Fawzi Boudjema🇫🇷 · Hao Sun🇨🇳

   $pp\to W^{\pm }h,Zh$ processes at the LHC are studied in the framework of the inert doublet model (IDM). To quantify the effects of the IDM and their observability in these processes we revisit the NLO (QCD and EW) predictions in the Standard Model (SM) and their uncertainty. Taking all available current constraints on the parameter space of the IDM, we consider both the case of the IDM providing a good Dark Matter (DM) candidate within the freeze-out mechanism as well as when the DM restrictions are relaxed. In the former, deviations from the SM of only a few per mil in these cross sections at the LHC are found and may not be measured. In the latter, the deviations can reach a few percents and should be observable. Smaller discrepancies in this case require that the theoretical uncertainties be improved, in particular those arising from the parton distribution functions (PDFs). We stress the importance of the photon-induced real corrections and the need for further improvement in the extraction of the photon PDF. The analysis also showcases the development and exploitation of our automated tool for the computation of one-loop electroweak and QCD corrections for a New Physics model with internal tests such as those concerning the soft and collinear parts provided through both dipole subtraction and phase space slicing besides tests for ultra-violet finiteness and gauge-parameter independence.

   hep-phJHEP(2025)·5 citations
6. 06*

   PASCL: Supervised Contrastive Learning with Perturbative Augmentation for Particle Decay Reconstruction

   Junjian Lu🇨🇳 · Siwei Liu🇦🇪 · Dmitrii Kobylianski🇮🇱 · Etienne Dreyer🇮🇱 · Eilam Gross🇮🇱 · Shangsong Liang🇺🇸

   In high-energy physics, particles produced in collision events decay in a format of a hierarchical tree structure, where only the final decay products can be observed using detectors. However, the large combinatorial space of possible tree structures makes it challenging to recover the actual decay process given a set of final particles. To better analyse the hierarchical tree structure, we propose a graph-based deep learning model to infer the tree structure to reconstruct collision events. In particular, we use a compact matrix representation termed as lowest common ancestor generations (LCAG) matrix, to encode the particle decay tree structure. Then, we introduce a perturbative augmentation technique applied to node features, aiming to mimic experimental uncertainties and increase data diversity. We further propose a supervised graph contrastive learning algorithm to utilize the information of inter-particle relations from multiple decay processes. Extensive experiments show that our proposed supervised graph contrastive learning with perturbative augmentation (PASCL) method outperforms state-of-the-art baseline models on an existing physics-based dataset, significantly improving the reconstruction accuracy. This method provides a more effective training strategy for models with the same parameters and makes way for more accurate and efficient high-energy particle physics data analysis.

   hep-phcs.LGMach.Learn.Sci.Tech.(2024)·3 citations
7. 07*

   Transversity generalized parton distributions in spin-3/2 particles

   Dongyan Fu🇨🇳 · Yubing Dong🇨🇳 · S. Kumano🇨🇳

   The definitions of the quark and gluon transversity generalized parton distributions (GPDs) in spin-3/2 particles are obtained in the light-cone gauge. It is found that they contain 16 independent components for each parton. Their even or odd property is found in terms of skewness variable, and the odd transversity GPDs vanish in the forward limit. There are 16 amplitudes with helicity flip of quark or gluon. We conclude that all the amplitudes, unpolarized, polarized, and transversity amplitudes, have a common factor $F(\zeta )$ carrying all the complex part. Here, the variable $\zeta$ is the helicity difference $\zeta =({\lambda }^{\prime }-\lambda )-({\mu }^{\prime }-\mu )$ for the amplitude ${\mathcal{A}}_{{\lambda }^{\prime }{\mu }^{\prime },\lambda \mu }$. This kinematical factor is associated with the transfer of the orbital angular momentum in the quark- and gluon-spin-3/2 particle scattering amplitudes. We also derive another main physical quantity, transversity distribution, from the transversity GPDs in the forward limit for the spin-3/2 particles.

   hep-phhep-exhep-latnucl-thPRD(2024)·8 citations
8. 08*

   The Properties of Radially Excited Charmonia in The Light Front Quark Model

   Muhammad Ridwan🇮🇩 · Ahmad Jafar Arifi🇯🇵 · Terry Mart🇮🇩

   Investigating the properties of excited charmonia is important to clarify its internal structure. In this paper, we present the mass spectra (MS) and decay constants (DC) for charmonia up to 3S states calculated by means of the light-front quark model based on a variational approach. In particular, we consider the QCD-motivated effective Hamiltonian, which includes both confinement (linear and screened) and Coulomb-like potentials. Furthermore, since the existence of the nature of heavy quark symmetry, we treat hyperfine interactions perturbatively. We developed the harmonic oscillator expansion method to approximate the wave function (WF) for excited states. We found that the results of our theoretical calculations, using screened potentials rather than linear ones, are in good agreement with experimental data. By looking at the mass and decay constant result, we found that our result on the {\psi}(3S) state matched the properties of the {\psi}(4040) resonance.

   hep-phnucl-thITM Web Conf.(2024)·4 citations
9. 09*

   QCD Kondo effect for single heavy quark in chiral-symmetry broken phase

   Shigehiro Yasui🇯🇵 · Daiki Suenaga🇯🇵 · Kei Suzuki🇯🇵

   We consider the quantum chromodynamics (QCD) Kondo effect for a single heavy quark in quark matter composed of light quarks with chiral symmetry breaking. Introducing several spinor structures in QCD Kondo condensates, i.e., particle-projected condensate, antiparticle-projected condensate, and normal condensate without projection, we calculate the attractive energy gained by the heavy quark within the mean-field approximation in the path-integral formalism. We show that the normal condensate is favored at low density and the particle-projected condensate is favored at high density, when the light quark has a nonzero mass. We interpret such a density-dependent transition between the two condensates in terms of the Kondo resonances.

   hep-phcond-mat.str-elnucl-thPRD(2024)·1 citation
10. 10*

    Affleck-Dine leptogenesis scenario for resonant production of sterile neutrino dark matter

    Kentaro Kasai🇯🇵 · Masahiro Kawasaki🇯🇵 · Kai Murai🇯🇵

    Sterile neutrino is a fascinating candidate for dark matter. In this paper, we examine the Affleck-Dine (AD) leptogenesis scenario generating a large lepton asymmetry, which can induce the resonant production of sterile neutrino dark matter via the Shi-Fuller (SF) mechanism. We also revisit the numerical calculation of the SF mechanism and the constraints from current X-ray and Lyman-$\alpha$ forest observations. We find that the AD leptogenesis scenario can explain the production of sterile neutrino dark matter by incorporating a non-topological soliton with a lepton charge called L-ball. Finally, we discuss an enhancement of second-order gravitational waves at the L-ball decay and investigate the testability of our scenario with future gravitational wave observations.

    hep-phastro-ph.COJCAP(2024)·8 citations
11. 11*

    Hybrid spectroscopy within the Graviton Soft-Wall model

    Matteo Rinaldi🇮🇹 · Vicente Vento🇪🇸

    In this analysis, the so-called holographic graviton soft-wall model (GSW), first developed to investigate the glueball spectrum, has been adopted to predict the masses of hybrids with different quantum numbers. Results have been compared with other models and lattice calculations. We have extended the GSW model by introducing two modifications based on anomalous dimensions in order to improve our agreement with other calculations and to remove the initial degeneracy not accounted for by lattice predictions. These modifications do not involve new parameters. The next step has been to identify which of our calculated states agree with the PDG data, leading to experimental hybrids. The procedure has been extended to include hybrids made of heavy quarks by incorporating the quark masses into the model.

    hep-phPRD(2024)·3 citations
12. 12*

    Principle of multi-critical-points in the ALP-Higgs model and the corresponding phase transition

    Jiyuan Ke🇨🇳 · Minxing Li🇨🇳 · Ping He🇨🇳

    The principle of multi-critical-points (PMCP) may be a convincing approach to determine the emerging parameter values in different kinds of beyond-standard-model (BSM) models. This could certainly be applied to solve the problem of undetermined new parameters in the ALP-Higgs interaction models. In this paper, we apply this principle to such model and investigate whether there are suitable solutions. Then, using the 1-loop effective potential, we study the phase transition property of this model under the PMCP requirement. It is gratifying to find that under the requirement of PMCP, the phase transition can be not only first-order, but also strong enough to serve as a solution for electroweak baryongenesis (EWBG). Finally, we show the parameter space of ALP and provide the parameter range that leads to the first-order phase transition.

    hep-phPLB(2024)·3 citations
13. 13*

    An Exotic Path to Glue states Decay

    Jean-Marie Frère🇧🇪

    Glueballs are the most obvious, but this far not fully tested prediction of Quantum Chromodynamics. The lowest expected glueball states, in particular $0^{++}$ states are difficult to characterize, since they share the quantum numbers of the "vacuum" and of a number of possible quark-antiquark states. In this paper, we argue that the more easily identifiable exotics provide us with strong hints on the way to pursue the chase, and in particular the relation with quantum anomalies and the $\eta$ and ${\eta }^{\prime }$ states.

    hep-phhep-thPoS(2024)·3 citations
14. 14*

    Impact of laser focussing and radiation reaction on particle spectra from nonlinear Breit-Wheeler pair production in the nonperturbative regime

    A. Eckey🇩🇪 · A. Golub🇩🇪 · F. C. Salgado🇩🇪 · S. Villalba-Chávez🇩🇪 · A. B. Voitkiv🇩🇪 · M. Zepf🇩🇪 · C. Müller🇩🇪

    Near-future experiments intend to detect strong-field Breit-Wheeler pair creation from the collision between bremsstrahlung bursts containing GeV-$\gamma$ quanta and high-intensity laser pulses. In this theoretical study, we investigate the influence of laser focusing, radiation reaction and a broad bremsstrahlung $\gamma$ spectrum on the energy and angular distributions of created pairs. Understanding the role of these inherent reaction attributes provides relevant insights for experimental detection strategies and data interpretation. We show that the inclusion of radiation reaction leads to a narrow energy spectrum of the yielded particles, whose maximum is shifted to substantially lower energies as compared to the case in which radiative energy losses are ignored. The broad bremsstrahlung spectrum also has distinct influence on the particle distributions, whereas the impact of laser focusing turns out to be rather moderate in the considered parameter regime.

    hep-phphysics.atom-phPRA(2024)·5 citations
15. 15*

    Simultaneous reweighting of Transverse Momentum Dependent distributions

    Mariaelena Boglione🇮🇹 · Umberto D'Alesio🇮🇹 · Carlo Flore🇮🇹 · Josè Osvaldo Gonzalez-Hernandez🇮🇹 · Francesco Murgia🇮🇹 · Alexei Prokudin🇺🇸

    The Bayesian reweighting procedure is extended to the case of multiple independent extractions of transverse momentum dependent parton distributions (TMDs). By exploiting the data on transverse single spin asymmetries, $A_N$, for inclusive pion production in polarized proton-proton collisions measured at RHIC, we perform a simultaneous reweighting of the quark Sivers, transversity and Collins TMD functions extracted from semi-inclusive deep inelastic scattering (SIDIS) and $e^{+}{e}^{-}$ annihilation into hadron pairs. The impact of the implementation of the Soffer bound, as well as the differences between older and newer $A_N$ data, are investigated. The agreement with $A_N$ data at large-$x_F$ values, a kinematical region complementary to those explored in SIDIS measurements, is enhanced, improving the knowledge of the polarized quark TMDs in the large-$x$ region.

    hep-phhep-exhep-thnucl-thPLB(2024)·21 citations
16. 16*

    Equivariant, Safe and Sensitive -- Graph Networks for New Physics

    Akanksha Bhardwaj🇺🇸 · Christoph Englert🇬🇧 · Wrishik Naskar🇬🇧 · Vishal S. Ngairangbam🇬🇧 · Michael Spannowsky🇬🇧

    This study introduces a novel Graph Neural Network (GNN) architecture that leverages infrared and collinear (IRC) safety and equivariance to enhance the analysis of collider data for Beyond the Standard Model (BSM) discoveries. By integrating equivariance in the rapidity-azimuth plane with IRC-safe principles, our model significantly reduces computational overhead while ensuring theoretical consistency in identifying BSM scenarios amidst Quantum Chromodynamics backgrounds. The proposed GNN architecture demonstrates superior performance in tagging semi-visible jets, highlighting its potential as a robust tool for advancing BSM search strategies at high-energy colliders.

    hep-phhep-exJHEP(2024)·14 citations
17. 17*

    The Primordial Black Hole Abundance: The Broader, the Better

    A. Ianniccari🇨🇭 · A.J. Iovino🇮🇹 · A. Kehagias🇬🇷 · D. Perrone🇨🇭 · A. Riotto🇨🇭

    We show that the abundance of primordial black holes, if formed through the collapse of large fluctuations generated during inflation and unless the power spectrum of the curvature perturbation is very peaked, is always dominated by the broadest profile of the compaction function, even though statistically it is not the most frequent. The corresponding threshold is therefore 2/5. This result exacerbates the tension when combining the primordial black hole abundance with the signal seen by pulsar timing arrays and originated from gravitational waves induced by the same large primordial perturbations.

    ↳ astro-ph.COgr-qchep-phPRD(2024)·37 citations
18. 18*

    Evolution of strictly localized states in non-interacting quantum field theories with background fields

    M. Alkhateeb🇫🇷 · A. Matzkin🇫🇷

    We investigate the construction of spin-1/2 fermionic and spin-0 bosonic wave-packets having compact spatial support in the framework of a computational quantum field theory (QFT) scheme offering space-time solutions of the relativistic wave equations in background fields. In order to construct perfectly localized wave-packets, we introduce a spatial density operator accounting for particles of both positive and negative charge. We examine properties of the vacuum and single-particle expectation values of this operator and compare them to the standard QFT particle and anti-particle spatial densities. The formalism is illustrated by computing numerically the Klein tunneling dynamics of strictly localized wave-packets impinging on a supercritical electrostatic step. The density operator introduced here could be useful to model situations in which it is desirable to avoid dealing with the infinite spatial tails intrinsic to pure particle or anti-particle wave-packets.

    ↳ quant-phhep-phhep-thPRA(2024)·5 citations
19. 19*

    Topological heavy-flavor tagging and intrinsic bottom at the Electron-Ion Collider

    Thomas Boettcher🇺🇸

    Heavy-flavor hadron production, in particular bottom hadron production, is difficult to study in deep-inelastic scattering (DIS) experiments due to small production rates and branching fractions. To overcome these limitations, a method for identifying heavy-flavor DIS events based on event topology is proposed. Based on a heavy-flavor jet tagging strategy developed for the LHCb experiment, this algorithm uses displaced vertices to identify decays of heavy-flavor hadrons. The algorithm's performance at the Electron-Ion Collider is demonstrated using simulation, and it is shown to provide discovery potential for non-perturbative intrinsic bottom quarks in the proton.

    ↳ hep-exhep-phnucl-exPRD(2024)·1 citation
20. 20*

    Holographic Inflation, Primordial Black Holes and Early Structure Formation

    Tom Banks🇺🇸 · Willy Fischler🇺🇸

    Evidence has accumulated that there are supermassive black holes (SMBHs) in the centers of most galaxies, and that these were formed in the very early universe by some as yet unknown process. In particular, there is evidence [15] that at least some galaxies formed as early as $10^8$ to $10^9$ years after the Big Bang host SMBHs. We suggest that the holographic model of inflation, whose dark matter candidates are primordial black holes carrying a discrete gauge charge, which originated as a small subset of the inflationary horizon volumes in the very early universe, can provide the seeds for this early structure formation. Aspects of the model pointed out long ago suggested an early era of structure formation, with structures dominated by dark matter. The additional assumption that the dark matter consists of discretely charged black holes implies black hole dominance of early structures, which seems to be implied by JWST data.

    ↳ hep-thastro-ph.COastro-ph.GAgr-qc+1Int.J.Mod.Phys.D(2024)·4 citations
21. 21*

    CaloGraph: Graph-based diffusion model for fast shower generation in calorimeters with irregular geometry

    Dmitrii Kobylianskii🇮🇱 · Nathalie Soybelman🇮🇱 · Etienne Dreyer🇮🇱 · Eilam Gross🇮🇱

    Denoising diffusion models have gained prominence in various generative tasks, prompting their exploration for the generation of calorimeter responses. Given the computational challenges posed by detector simulations in high-energy physics experiments, the necessity to explore new machine-learning-based approaches is evident. This study introduces a novel graph-based diffusion model designed specifically for rapid calorimeter simulations. The methodology is particularly well-suited for low-granularity detectors featuring irregular geometries. We apply this model to the ATLAS dataset published in the context of the Fast Calorimeter Simulation Challenge 2022, marking the first application of a graph diffusion model in the field of particle physics.

    ↳ hep-exhep-phPRD(2024)·28 citations
22. 22*

    Lattice QCD and Baryon-Baryon Interactions

    Sinya Aoki🇯🇵 · Takumi Doi🇯🇵

    In this chapter, the current status on baryon-baryon interactions such as nuclear forces in lattice Quantum ChromoDynamics (QCD) is reviewed. In studies of baryon-baryon interactions in lattice QCD, the most reliable method so far is the potential method, proposed by the Hadrons to Atomic nuclei from Lattice QCD (HAL QCD) collaboration, whose formulation, properties and extensions are explained in detail. Using the HAL QCD potential method, potentials between nucleons (proton and neutron, denoted by $N$) in the derivative expansion have been extracted in various cases. The lattice QCD results shown in this chapter include a Leading Order (LO) central potential in the parity-even $NN{(}^1{S}_0)$ channel, LO central and tensor potentials in the parity-even $NN{(}^3{S}_1$-${}^3{D}_1)$ channel, and a Next-to-Leading Order (NLO) spin-orbit potential as well as LO potentials in the parity-odd channels. Preliminary results at the almost physical pion and kaon masses, in addition to exploratory studies on three-nucleon potentials, are presented. Interactions between generic baryons including hyperons, made of one or more strange quarks as well as up and down quarks, have also been investigated. Universal properties of potentials between baryons become manifest in the flavor SU(3) symmetric limit, where masses of three quarks, up, down and strange, are all equal. In particular, it is observed that one bound state, traditionally called the $H$-dibaryon, appears in the flavor singlet representation of SU(3). A fate of the $H$ dibaryon is also discussed with flavor SU(3) breaking taken into account at the almost physical point. Finally, various kinds of dibaryons, bound or resonate states of two baryons, including charmed dibaryons, have been predicted by lattice QCD simulations at the almost physical point.

    ↳ hep-lathep-phnucl-th"Handbook of Nuclear Physics" (Springer, …·11 citations
23. 23*

    Electroweak three-body decays in the presence of two- and three-body bound states

    Raul A. Briceño🇺🇸 · Andrew Jackura🇺🇸 · Dimitra A. Pefkou🇺🇸 · Fernando Romero-López🇺🇸

    Recently, formalism has been derived for studying electroweak transition amplitudes for three-body systems both in infinite and finite volumes. The formalism provides exact relations that the infinite-volume amplitudes must satisfy, as well as a relationship between physical amplitudes and finite-volume matrix elements, which can be constrained from lattice QCD calculations. This formalism poses additional challenges when compared with the analogous well-studied two-body equivalent one, including the necessary step of solving integral equations of singular functions. In this work, we provide some non-trivial analytical and numerical tests on the aforementioned formalism. In particular, we consider a case where the three-particle system can have three-body bound states as well as bound states in the two-body subsystem. For kinematics below the three-body threshold, we demonstrate that the scattering amplitudes satisfy unitarity. We also check that for these kinematics the finite-volume matrix elements are accurately described by the formalism for two-body systems up to exponentially suppressed corrections. Finally, we verify that in the case of the three-body bound state, the finite-volume matrix element is equal to the infinite-volume coupling of the bound state, up to exponentially suppressed errors.

    ↳ hep-lathep-phnucl-thJHEP(2024)·10 citations
24. 24*

    Dynamics, quantum states and Compton scattering in nonlinear gravitational waves

    Giulio Audagnotto🇩🇪 · Antonino Di Piazza🇺🇸

    The classical dynamics and the construction of quantum states in a plane wave curved spacetime are examined, paying particular attention to the similarities with the case of an electromagnetic plane wave in flat spacetime. A natural map connecting the dynamics of a particle in the Rosen metric and the motion of a charged particle in an electromagnetic plane wave is unveiled. We then discuss how this map can be translated into the quantum description by exploiting the large number of underlying symmetries. We examine the complete analogy between Volkov solutions and fermion states in the Rosen chart and properly extend this to massive vector bosons. We finally report the squared S-matrix element of Compton scattering in a sandwich plane wave spacetime in the form of a two-dimensional integral.

    ↳ gr-qchep-phhep-thJHEP(2024)·5 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.