Fri·May 17, 2024Friday·May 17, 2024

1. 01*

   Neutral-pion decay into an electron-positron pair: A review and update

   Tomáš Husek (Charles U. and Birmingham U.)🇨🇿

   This work aims to review several aspects of the current status of the rare ${\pi }^0\to e^{+}{e}^{-}$ decay. A particular emphasis is made on radiative corrections and detailed interpretation of related quantities, some numbers appearing in the literature are updated, and the connection with the Dalitz decay, ${\pi }^0\to e^{+}{e}^{-}\gamma$, is discussed. This comes timely as it is aligned with an announcement of a preliminary result of a new branching-ratio measurement done by the NA62 Collaboration, which brings new light into an earlier-reported discrepancy between the Standard Model prediction and the (until-recently latest) precise KTeV result.

   hep-phhep-exPRD(2024)·4 citations
2. 02*

   Gravitational Wave-Induced Freeze-In of Fermionic Dark Matter

   Azadeh Maleknejad🇬🇧 · Joachim Kopp🇨🇭

   The minimal coupling of massless fermions to gravity does not allow for their gravitational production solely based on the expansion of the Universe. We argue that this changes in presence of realistic and potentially detectable stochastic gravitational wave backgrounds. We compute the resulting energy density of Weyl fermions at 1-loop using in--in formalism. If the initially massless fermions eventually acquire mass, this mechanism can explain the dark matter abundance in the Universe. Remarkably, it may be more efficient than conventional gravitational production of superheavy fermions.

   hep-phastro-ph.COgr-qchep-thPRL(2026)·16 citations
3. 03*

   NNLO+PS predictions for Higgs production via bottom annihilation

   Christian Biello🇩🇪

   We report on the implementation of a new NNLO+PS event generator for the Higgs production via bottom annihilation using the MiNNLOPS method in the POWHEG framework. The calculation has been carried out in the five flavour scheme (5FS), where the bottom mass is neglected. We compare our results against fixed-order predictions at NNLO as well as resummed predictions at next-to-next-to-leading-logarithmic (NNLL) accuracy. We also present a preliminary study in the four flavour scheme (4FS) setup, achieving a new level of precision in the massive scheme.

   hep-ph1 citation
4. 04*

   Twenty years of ${\Theta }^{+}$

   Michal Praszalowicz🇵🇱

   Twenty years ago, in 2003, two experimental groups, LEPS and DIANA, announced the discovery of a light, narrow, exotic baryon with mass within the range of 1540 MeV, which was later dubbed as ${\Theta }^{+}$. In this talk we recall the history of this discovery and its theoretical foundations. We also discuss possible future experiments that could determine the existence of ${\Theta }^{+}$.

   hep-phPoS(2024)·8 citations
5. 05*

   Probing neutrino-nucleus interaction in DUNE and MicroBooNE

   R Lalnuntluanga🇮🇳 · R K Pradhan🇮🇳 · A Giri🇮🇳

   The neutrino experiments utilize heavy nuclear targets to achieve high statistics neutrino-nucleus interaction event rate, which leads to systematic uncertainties in the oscillation parameters due to the nuclear effects and uncertainties in the cross-section. Understanding the interaction of neutrinos with the nucleus becomes crucial in determining the oscillation parameters with high precision. We investigate the uncertainty in quasi-elastic interaction due to nuclear effects by selecting exactly 1 proton, 0 pions, and any number of neutrons in the final state in DUNE and MicroBooNE detectors, and the effects on the neutrino oscillation in the DUNE detector. The calorimetric method with this selection can be used for accurate neutrino energy reconstruction in the quasi-elastic channel where the nuclear effects are inevitable.

   hep-phhep-exnucl-thNPB(2024)·3 citations
6. 06*

   High-Scale SUSY from Sgoldstino Inflation

   C. Pallis🇬🇷

   We review a number of unimodular no-scale supergravity models with F-term SUSY breaking which support technically natural de Sitter vacua. A variant of these models develops a stage of inflection-point inflation which can be realized for subplanckian field values consistently with the observational data. For central value of the spectral index ns, the necessary tuning is of the order of 10^-6, the tensor-to-scalar ratio is tiny whereas the running of ns is around -3x10^-3. Our proposal is compatible with high-scale SUSY and the results of LHC on the Higgs boson mass.

   hep-phastro-ph.COhep-thPoS(2024)·0 citations
7. 07*

   Shedding Light on Hadronization by Quarkonium Energy Correlator

   An-Ping Chen🇨🇳 · Xiaohui Liu🇨🇳 · Yan-Qing Ma🇨🇳

   We propose to measure the energy correlator in quarkonium production, which tracks the energy deposited in the calorimeter $\chi$-angular distance away from the identified quarkonium. The observable eliminates the need for jets while sustaining the perturbative predictive power. Analyzing the power correction to the energy correlator, we demonstrate the novel observable supplies a unique gateway to probing the hadronization, especially when $\cos \chi \gtrsim 0$ in the quarkonium rest frame where the perturbative emissions are depleted due to the dead-cone effects. We expect the quarkonium energy correlator to add a new dimension to quarkonium studies.

   hep-phhep-exPRL(2024)·24 citations
8. 08*

   Global analysis of the $U(3{)}^5$ symmetric SMEFT

   Riccardo Bartocci🇩🇪

   The $U(3{)}^5$ symmetry within the SMEFT framework restricts the inclusion of only fully flavor-conserving operators at dimension six. This proceeding presents a global analysis of the SMEFT under this assumption. We provide global constraints on all 41 Wilson coefficients, utilizing leading-order and next-to-leading-order SMEFT predictions for various experiments including parity-violating experiments, Electroweak Precision Observables (EWPO), Higgs physics, top quark interactions, flavor observables, dijet production, and lepton scatterings. We address issues concerning the constraints of specific four-quark operators, investigate correlations between observables at different energy scales, and assess the impact of next-to-leading-order contributions on the global fit.

   hep-phhep-th5 citations
9. 09*

   The $a_1$ factorisation coefficient in ${\overline{B}}^0\to D^{(\ast )+}{M}^{-}$ and ${\overline{B}}^0\to D^{(\ast )+}{D}_s^{(\ast )-}$ decays: measurements versus theory

   A. Le Yaouanc🇫🇷 · J.-P. Leroy🇫🇷 · P.Roudeau🇫🇷

   Using recent measurements of exclusive B-meson decays we extract the $a_1$ factorization parameter in ${\overline{B}}_d^0\to D^{(\ast {)}^{+}}{K}^{-}/{\pi }^{-}$ decay channels. { The values obtained in the four channels are very similar, in agreement with the theoretical expectations obtained in the $m_Q\to \infty$ limit, but the measured values differ definitely from the expected central values. } Such differences have already been observed. Using recent data, we improve the accuracy by {a factor close to two} in this comparison. We study possible interpretations for such a difference and conclude that the claimed accuracy of corrections due to soft gluon contributions and finite mass effects has to be revisited before arguing for possible "New-Physics" effects. We observe that the corrections to the $m_Q\to \infty$ limit are larger in the spectator topology than effects from exchange amplitude contributions. We discuss also the way expected ratios of $a_1$ values, involving hypotheses from theory, are used to obtain the fraction of $B_s^0$ meson production in jets at LHC and conclude that the uncertainties attached to this approach are not well established. Finally, the $a_1$ values extracted from ${\overline{B}}_d^0\to D^{(\ast )+}{D}_s^{-}$ decays are found to be similar, within uncertainties, to the ones obtained with $K^{-}$ emission, once expected penguin contributions are corrected. Using the same approach, we note that $a_1$ values measured in channels with a $D_s^{\ast -}$ emission are about two standard deviations lower than $a_1(D^{(\ast )+}{K}^{-}$).

   hep-phhep-ex1 citation
10. 10*

    Production of electroweak gauge bosons at forward rapidities in the color - dipole $S$ - matrix framework

    Yan B. Bandeira🇧🇷 · Victor P. Goncalves🇧🇷 · Wolfgang Schäfer🇵🇱

    The cross-section for the production of an electroweak gauge boson ($G=W^{\pm },Z^0,\gamma$) at forward rapidities in $pp$ collisions is derived within the color - dipole $S$ - matrix framework. We present the full expressions for the differential cross-section of the $qp\to GX$ process in the impact parameter and transverse momentum spaces, considering the longitudinal and transverse polarizations of the gauge boson. The particular cases associated with the Drell - Yan process and real photon production are discussed. We demonstrate that the final formulae are expressed in terms of the dipole - proton cross-section or the unintegrated gluon distribution, and can be used to estimate the impact of the saturation effects in the gauge boson production at the LHC and future colliders.

    hep-phhep-exJHEP(2024)·3 citations
11. 11*

    Asymmetric Warm Dark Matter: from Cosmological Asymmetry to Chirality of Life

    Wen Yin🇯🇵 · Shota Nakagawa🇨🇳 · Tamaki Murokoshi🇯🇵 · Makoto Hattori🇯🇵

    We investigate a novel scenario involving asymmetric keV-range dark matter (DM) in the form of right-handed (sterile) neutrinos. Based on the Fermi-Dirac distribution, we demonstrate that asymmetric fermionic DM forms a Fermi degenerate gas, making it potentially colder than symmetric fermionic DM. This setup simultaneously accounts for the Universe's baryon asymmetry through tiny Yukawa interactions with Standard Model leptons and the Higgs field, and the homochirality of amino acids via decay into circularly polarized photons. This scenario can be investigated through soft X-ray searches conducted by current and upcoming space missions. The helical X-rays is a smoking-gun signal of our scenario. Additionally, we propose a new mechanism to suppress DM thermal production by introducing a light modulus, which may also benefit cosmology involving generic right-handed neutrinos with large mixing.

    hep-phastro-ph.COastro-ph.GAastro-ph.IM+1JCAP(2025)·6 citations
12. 12*

    Neutrino Mixing from a Fresh Perspective

    Pralay Chakraborty🇮🇳 · Manash Dey🇮🇳 · Biswajit Karmakar🇵🇱 · Subhankar Roy🇮🇳

    We propose a neutrino mass matrix texture bearing a suitable correlation $m_{22}=-2m_{13}$ and study its phenomenological implications. In light of both normal and inverted hierarchies, the texture imposes specific bounds on some observational parameters. As a potential application, the prediction of effective Majorana neutrino mass $m_{\beta \beta }$ is visualized for both hierarchies. To understand the proposed texture from the first principle, we incorporate the type-I+II seesaw mechanism in association with $A_4\times Z_{10}\times Z_2$ group.

    hep-phPLB(2024)·10 citations
13. 13*

    Targeting (Pseudo)-Scalar CP Violation with $B_s\to {\mu }^{+}{\mu }^{-}$

    Robert Fleischer🇳🇱 · Eleftheria Malami🇳🇱 · Anders Rehult🇳🇱 · K. Keri Vos🇳🇱

    The leptonic decay $B_s\to {\mu }^{+}{\mu }^{-}$ is both rare and theoretically clean, making it an excellent probe for New Physics searches. Due to its helicity suppression in the Standard Model, this decay is particularly sensitive to new (pseudo)-scalar contributions. We present a new strategy for detecting CP-violating New Physics contributions of this kind, exploiting two observables: ${\mathcal{A}}_{\Delta {\Gamma }_s}^{\mu \mu }$, which is accessible due to the sizeable decay width difference of the $B_s$ system, and the mixing-induced CP asymmetry ${\mathcal{S}}_{\mu \mu }$. The strategy also uses information from $B\to K^{(\ast )}{\mu }^{+}{\mu }^{-}$ and $B_s\to \varphi {\mu }^{+}{\mu }^{-}$ decays. We find remarkably constrained regions in the ${\mathcal{A}}_{\Delta {\Gamma }_s}^{\mu \mu }$-${\mathcal{S}}_{\mu \mu }$ plane that serve as promising targets for future measurements.

    hep-phhep-exJHEP(2024)·12 citations
14. 14*

    Dark matter in QCD-like theories with a theta vacuum: cosmological and astrophysical implications

    Camilo García-Cely🇪🇸 · Giacomo Landini🇪🇸 · Óscar Zapata🇨🇴

    QCD-like theories in which the dark matter (DM) of the Universe is hypothesized to be a thermal relic in the form of a dark pion has been extensively investigated, with most studies neglecting the CP-violating $\theta$-angle associated with the topological vacuum. We point out that a non-vanishing $\theta$ could potentially trigger resonant number-changing processes giving rise to the observed relic density in agreement with perturbative unitarity as well as observations of clusters of galaxies. This constitutes a novel production mechanism of MeV DM and an alternative to those relying on the Wess-Zumino-Witten term. Moreover, for specific meson mass spectra, similar resonant scatterings serve as a realization of velocity-dependent self-interacting DM without a light mediator. Explicit benchmark models are presented together with a discussion of possible signals, including gravitational waves from the chiral phase transition associated with the dark pions.

    hep-phPRD(2025)·13 citations
15. 15*

    BSQ Conserved Charges in Relativistic Viscous Hydrodynamics solved with Smoothed Particle Hydrodynamics

    Christopher Plumberg🇺🇸 · Dekrayat Almaalol🇺🇸 · Travis Dore🇺🇸 · Débora Mroczek🇺🇸 · Jordi Salinas San Martín🇺🇸 · Willian M. Serenone🇺🇸 · Lydia Spychalla🇺🇸 · Patrick Carzon🇺🇸 · Matthew D. Sievert🇺🇸 · Fernando G. Gardim🇧🇷 · Jacquelyn Noronha-Hostler🇺🇸

    Conservation laws play a crucial role in the modeling of heavy-ion collisions, including the those for charges such as baryon number (B), strangeness (S), and electric charge (Q). In this study, we present a new 2+1 relativistic viscous hydrodynamic code called CCAKE which uses the Smoothed Particle Hydrodynamics (SPH) formalism to locally conserve BSQ charges, together with an extended description of the multi-dimensional equation of state (EoS) obtained from lattice Quantum Chromodynamics. Initial conditions for CCAKE are supplied by the ICCING model, which samples gluon splittings into quark anti-quark pairs to generate the initial BSQ charge distributions. We study correlations between the BSQ charges and find that local BSQ fluctuations remain finite during the evolution, with corresponding chemical potentials of ($\sim 100$--$200\mathrm{MeV}$) at freeze-out. We find that our framework produces reasonable multiplicities of identified particles and that ICCING has no significant effect on the collective flow of all charged particles nor of identified particles when only one particle of interest is considered. However, we show specifically for Pb+Pb collisions at the LHC $\sqrt{s_{NN}}=5.02$ TeV that ICCING does have an effect on collective flow of identified particles if two particles of interest are considered.

    ↳ nucl-thhep-phPRC(2025)·28 citations
16. 16*

    Cosmological Singularity and Power-Law Solutions in Modified Gravity

    Saurya Das🇨🇦 · S. Shajidul Haque🇿🇦 · Seturumane Tema🇿🇦

    A bouncing Universe avoids the big-bang singularity. Using the time-like and null Raychaudhhuri equations, we explore whether the bounce near the big-bang, within a broad spectrum of modified theories of gravity, allows for cosmologically relevant power-law solutions under reasonable physical conditions. Our study shows that certain modified theories of gravity, such as Stelle gravity, do not demonstrate singularity resolution under any reasonable conditions, while others including $f(R)$ gravity and Brans-Dicke theory can demonstrate singularity resolution under suitable conditions. For these theories, we show that the accelerating solution is slightly favoured over ekypyrosis.

    ↳ gr-qcastro-ph.COhep-phhep-thAnnals Phys.(2024)·5 citations
17. 17*

    Supermassive black hole formation from Affleck-Dine mechanism with suppressed clustering on large scales

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

    We study a primordial black hole (PBH) formation model based on the framework of the inhomogeneous Affleck-Dine (AD) mechanism, which can explain the seeds of supermassive black holes (SMBHs). This model, however, predicts strong clustering of SMBHs that is inconsistent with the observation of angular correlation of quasars. In this paper, we propose a modified model that can significantly reduce the PBH clustering on large scales by considering a time-dependent Hubble-induced mass during inflation. The quasar angular correlation is suppressed by the large Hubble-induced mass in the early stage of inflation while the small Hubble-induced mass in the late stage leads to the AD field fluctuations large enough for PBH formation as in the original model. As a result, the modified scenario can successfully explain the seeds of SMBHs.

    ↳ astro-ph.COhep-phPRD(2025)·6 citations
18. 18*

    A study of the fine-structure constant dependence of radiative capture in Halo-EFT

    Ulf-G. Meißner🇩🇪 · Bernard Ch. Metsch🇩🇪 · Helen Meyer🇩🇪

    We study the fine-structure constant dependence of the rates of some selected radiative capture reactions within the framework of so-called Halo Effective Field Theory in order to assess the adequacy of some assumptions made on the Coulomb penetrability. We find that this dependence deviates from that implied by a parameterization of the cross sections of this effect via a simple penetration factor. Some features of this fine-structure dependence are discussed, in particular its potential impact on the abundances of the light elements in primordial nucleosynthesis.

    ↳ nucl-thastro-ph.COhep-phhep-th+1EPJA(2024)·2 citations
19. 19*

    Advancing Set-Conditional Set Generation: Diffusion Models for Fast Simulation of Reconstructed Particles

    Dmitrii Kobylianskii🇮🇱 · Nathalie Soybelman🇮🇱 · Nilotpal Kakati🇮🇱 · Etienne Dreyer🇮🇱 · Benjamin Nachman🇺🇸 · Eilam Gross🇮🇱

    The computational intensity of detector simulation and event reconstruction poses a significant difficulty for data analysis in collider experiments. This challenge inspires the continued development of machine learning techniques to serve as efficient surrogate models. We propose a fast emulation approach that combines simulation and reconstruction. In other words, a neural network generates a set of reconstructed objects conditioned on input particle sets. To make this possible, we advance set-conditional set generation with diffusion models. Using a realistic, generic, and public detector simulation and reconstruction package (COCOA), we show how diffusion models can accurately model the complex spectrum of reconstructed particles inside jets.

    ↳ hep-exhep-phPRD(2024)·9 citations
20. 20*

    Light-ray sum rules and the c-anomaly

    Thomas Hartman🇺🇸 · Grégoire Mathys🇨🇭

    In a four-dimensional quantum field theory that flows between two fixed points under the renormalization group, the change in the conformal anomaly $\Delta a$ has been related to the average null energy. We extend this result to derive a sum rule for the other anomaly coefficient, $\Delta c$, in terms of the stress tensor three-point function. While the sum rule for $\Delta a$ is an expectation value of the averaged null energy operator, and therefore positive, the result for $\Delta c$ involves the off-diagonal matrix elements, so it does not have a fixed sign.

    ↳ hep-thhep-phJHEP(2024)·21 citations
21. 21*

    CMB Constraints on Natural Inflation with Gauge Field Production

    Khursid Alam🇮🇳 · Koushik Dutta🇮🇳 · Nur Jaman🇮🇳

    The natural inflation model with a periodic cosine potential is ruled out by recent Planck 2018 data for the decay constant $f\lesssim 5.5M_{\mathrm{Pl}}$. If the Planck data is combined with the BICEP Keck array and BAO data, the model is excluded (at $2$-$\sigma$) for all values of $f$. In this context, we revisit the model when the pseudoscalar inflation $\varphi$ is coupled with a gauge field via a coupling of the form $\frac{\alpha }{f}\varphi F\tilde{F}$, where $F(\tilde{F})$ denotes the gauge field (dual) strength tensor, and $\alpha$ is the coupling constant. The back-reactions associated with the gauge field production during the later stages of inflation extend the duration of inflation. We numerically evaluate the dynamics of the fields while neglecting the effects due to the perturbations in the inflaton field. It allows us to determine the scalar and tensor power spectra leading to the calculations of observables at the Cosmic Microwave Background (CMB) scales. We find that the natural inflation model survives the test of the latest data only for a certain range of the coupling constant $\alpha$. Our analysis shows that the latest constraints coming from the scalar spectral index are more stringent than the ones arising from the non-gaussianities and the running of the scalar spectrum. This leads to lower and upper bounds on ${\xi }_{\ast }$, the parameter that controls the growth of the gauge field.

    ↳ astro-ph.COgr-qchep-phhep-thJCAP(2024)·14 citations
22. 22*

    Investigating cosmic histories with a stiff era through Gravitational Waves

    Hannah Duval🇧🇪 · Sachiko Kuroyanagi🇪🇸 · Alberto Mariotti🇧🇪 · Alba Romero-Rodríguez🇧🇪 · Mairi Sakellariadou🇬🇧

    We investigate the potential of gravitational-wave background searches to constrain cosmic histories characterised by a stiff equation of state, preceded by a period of matter domination. Such a scenario leads to a characteristic peak in the primordial gravitational-wave spectrum originating from cosmological inflation. Assuming instant transitions between distinct epochs, which allows an analytical treatment of the gravitational-wave spectrum, we perform a Bayesian inference analysis to derive constraints from the first three observing runs of the LIGO-Virgo-KAGRA Collaboration. Additionally, we consider a smooth transition, employing an axion-like particle physics model, and highlight the difference with the instant transition approximation. We then forecast detection prospects for such a cosmic history through future gravitational-wave experiments.

    ↳ gr-qcastro-ph.COhep-phPRD(2024)·16 citations
23. 23*

    Summary of CKM 2023 working group 5: Direct CP violation (DCPV) including ${\varphi }_3/\gamma$ from $B\to DK$, DCPV effects, branching fractions and polarisation in charmless $B_{(s)}$ decays

    Melissa Cruz Torres🇭🇳 · Tobias Huber🇩🇪 · Minakshi Nayak🇮🇳 · Gilberto Tetlalmatzi-Xolocotzi🇩🇪

    In this contribution a summary of the activities of Working Group 5 (WG5) presented during the 12th International Workshop on the CKM Unitarity Triangle (CKM2023) is reported. This includes new results on ${\varphi }_3/\gamma$ measurements using $B\to DK$ decays, search for $CP$ violation using charmless $B$ decays and $b$-Baryon decays, measurement of branching ratios in hadronic $B$ to charm decays, and theory of three-body nonleptonic $B$ decays.

    ↳ hep-exhep-ph0 citations
24. 24*

    Quantum Complexity Fluctuations from Nuclear and Hypernuclear Forces

    Caroline E. P. Robin🇩🇪 · Martin J. Savage🇺🇸

    Toward an improved understanding of the role of quantum information in nuclei and exotic matter, we examine the quantum magic (non-stabilizerness) in low-energy strong interaction processes. As stabilizer states can be prepared efficiently using classical computers, and include classes of entangled states, it is quantum magic and fluctuations in quantum magic, together with entanglement, that determine computational resource requirements. As a measure of fluctuations in quantum magic, and hence the severity of the exponentially-scaling classical computing resource requirements, induced by scattering, the "magic power" of the S-matrix is introduced. This provides indirect experimental constraints on quantum resources required to model nuclei and dense matter using fault-tolerant quantum computers. Using experimentally-determined scattering phase shifts and mixing parameters, the magic power in nucleon-nucleon and hyperon-nucleon scattering, along with the magic in the deuteron, are found to exhibit interesting and distinct features. The ${\Sigma }^{-}$-baryon is identified as a potential candidate catalyst for enhanced spreading of magic and entanglement in dense matter, depending on in-medium decoherence.

    ↳ nucl-thhep-phquant-phPRC(2025)·50 citations
25. 25*

    Quantum Vision Transformers for Quark-Gluon Classification

    Marçal Comajoan Cara🇪🇸 · Gopal Ramesh Dahale🇮🇳 · Zhongtian Dong🇺🇸 · Roy T. Forestano🇺🇸 · Sergei Gleyzer🇺🇸 · Daniel Justice🇺🇸 · Kyoungchul Kong🇺🇸 · Tom Magorsch🇩🇪 · Konstantin T. Matchev🇺🇸 · Katia Matcheva🇺🇸 · Eyup B. Unlu🇺🇸

    We introduce a hybrid quantum-classical vision transformer architecture, notable for its integration of variational quantum circuits within both the attention mechanism and the multi-layer perceptrons. The research addresses the critical challenge of computational efficiency and resource constraints in analyzing data from the upcoming High Luminosity Large Hadron Collider, presenting the architecture as a potential solution. In particular, we evaluate our method by applying the model to multi-detector jet images from CMS Open Data. The goal is to distinguish quark-initiated from gluon-initiated jets. We successfully train the quantum model and evaluate it via numerical simulations. Using this approach, we achieve classification performance almost on par with the one obtained with the completely classical architecture, considering a similar number of parameters.

    ↳ quant-phcs.LGhep-phAxioms(2024)·13 citations
26. 26*

    Towards Unpolarized GPDs from Pseudo-Distributions

    Hervé Dutrieux🇺🇸 · Robert G. Edwards🇺🇸 · Colin Egerer🇺🇸 · Joseph Karpie🇺🇸 · Christopher Monahan🇺🇸 · Kostas Orginos🇺🇸 · Anatoly Radyushkin🇺🇸 · David Richards🇺🇸 · Eloy Romero🇺🇸 · Savvas Zafeiropoulos🇫🇷

    We present an exploration of the unpolarized isovector proton generalized parton distributions (GPDs) $H^{u-d}(x,\xi ,t)$ and $E^{u-d}(x,\xi ,t)$ in the pseudo-distribution formalism using distillation. Taking advantage of the large kinematic coverage made possible by this approach, we present results on the moments of GPDs up to the order $x^3$ -- including their skewness dependence -- at a pion mass $m_{\pi }=358$ MeV and a lattice spacing $a=0.094$ fm.

    ↳ hep-lathep-phJHEP(2024)·42 citations
27. 27*

    Probing Hidden Dimensions via Muon Lifetime Measurements

    Jorge G. Russo🇪🇸

    In the context of Kaluza-Klein theories, the time dilation of charged particles in an external field depends on the charge in a specific way. Experimental tests are proposed to search for extra dimensions using this distinctive feature.

    ↳ gr-qchep-phhep-thPLB(2024)·0 citations
28. 28*

    Cosmology with varying fundamental constants from hyperlight, coupled scalars

    Masha Baryakhtar🇺🇸 · Olivier Simon🇺🇸 · Zachary J. Weiner🇺🇸

    The fundamental constants at recombination can differ from their present-day values due to degeneracies in cosmological parameters, raising the possibility of yet-undiscovered physics coupled directly to the Standard Model. We study the cosmology of theories in which a new, hyperlight scalar field modulates the electron mass and fine-structure constant at early times. We find new degeneracies in cosmologies that pair early recombination with a new contribution to the matter density arising at late times, whose predictions can be simultaneously consistent with CMB and low-redshift distance measurements. Such "late dark matter" already exists in the Standard Model in the form of massive neutrinos but is necessarily realized by the scalar responsible for shifting the early-time fundamental constants. After detailing the physical effects of varying constants and hyperlight scalar fields on cosmology, we show that variations of the electron mass and fine structure constant are constrained at the percent and permille level, respectively, and a hyperlight scalar in the mass range $10^{-32}\mathrm{eV}\lesssim m_{\varphi }\lesssim 10^{-28}\mathrm{eV}$ can impact what variations are allowed while composing up to a percent of the present dark matter density. We comment on the potential for models with a varying electron mass to reconcile determinations of the Hubble constant from cosmological observations and distance-ladder methods, and we show that parameter inference varies significantly between recent baryon acoustic oscillation and type Ia supernova datasets.

    ↳ astro-ph.COhep-phPRD(2024)·62 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.