Mon·Dec 12, 2022Monday·December 12, 2022

1. 01*

   Revisiting $D$-meson twist-2, 3 distribution amplitudes

   Tao Zhong🇨🇳 · Dong Huang🇨🇳 · Hai-Bing Fu🇨🇳

   Due to the significant difference between the experimental measurements and the theoretical predictions of standard model (SM) for the value of $\mathcal{R}(D)$ of the semileptonic decay $B\to D\ell {\bar{\nu }}_{\ell }$, people speculate that it may be the evidence of new physics beyond the SM. Usually, the $D$-meson twist-2, 3 distribution amplitudes (DAs) ${\varphi }_{2;D}(x,\mu )$, ${\varphi }_{3;D}^p(x,\mu )$ and ${\varphi }_{3;D}^{\sigma }(x,\mu )$ are the main error sources when using perturbative QCD factorization and light-cone QCD sum rules to study $B\to D\ell {\bar{\nu }}_{\ell }$. Therefore, it is important to get more reasonable and accurate behaviors for those DAs. Motivated by our previous work [Phys. Rev. D 104, no.1, 016021 (2021)] on pionic leading-twist DA, we revisit $D$-meson twist-2, 3 DAs ${\varphi }_{2;D}(x,\mu )$, ${\varphi }_{3;D}^p(x,\mu )$ and ${\varphi }_{3;D}^{\sigma }(x,\mu )$. New sum rules formulae for the $\xi$-moments of these three DAs are suggested to obtain more accurate values. The light-cone harmonic oscillator models for those DAs are improved, and whose model parameters are determined by fitting the values of $\xi$-moments with the least squares method.

   hep-phCPC(2023)·6 citations
2. 02*

   Searching for relativistic axions in the sky

   Arpan Kar🇰🇷 · Tanmoy Kumar🇮🇳 · Sourov Roy🇮🇳 · Jure Zupan🇺🇸

   Relativistic axions produced in decays of $\mathcal{O}(10^{-7}-10^{-2}$ $\text{eV})$ dark matter (DM) partially convert to photons after traversing the galactic magnetic field, giving rise to a signal observable by the Square Kilometer Array (SKA) radio telescope. We show that for axions lighter than a few $\times$ $10^{-13}$ eV a 100 h SKA observation of the local dwarf galaxy Seg I would probe parameter space not constrained by stellar cooling and cosmological observations, with sensitivity several orders of magnitude better than the planned dedicated axion dark matter search experiments. We quantify the uncertainties in the SKA sensitivity projections due to two effects that enhance the radio flux: the presence of turbulent magnetic fields inside the galaxy, and the Bose enhancement of the DM decays to axions, where the latter, in particular, warrants further study.

   hep-phastro-ph.HEJCAP(2023)·11 citations
3. 03*

   Axial coupling constant in a magnetic background

   Cristián Villavicencio🇨🇱

   The nucleon axial coupling constant $g_A$ is calculated in the presence of an external uniform magnetic field using finite energy sum rules. The correlation function of proton, neutron and axial-vector currents is calculated both the hadronic and the QCD sector. Once the axial contribution in the form factor is isolated, a double sum rule is considered, i.e., the usual QCD contour integration for the external moments of both the proton and neutron current. The effects of the external magnetic field come mainly through the in-medium current-nucleon coupling constants ${\lambda }_N(B)$ and the hadronic thresholds $s_0(B)$ provided by the nucleon-nucleon correlators. As a result, the axial coupling constant decreases in the presence of the magnetic field.

   hep-phnucl-thPRD(2023)·9 citations
4. 04*

   Pseudo scalar dark matter in a generic U$(1{)}_X$ model

   Shivam Gola🇮🇳

   We consider a $U(1{)}_X$ extension of the Standard Model~(SM), where the spontaneous breaking of $U(1{)}_X$ gauge group results in a pseudo scalar particle which is the proposed candidate for dark matter. In the model, we introduce three right-handed neutrinos~(RHNs) $N_R^i$ and two extra scalars $\Phi$, $\chi$, which are SM gauge singlets but charged under $U(1{)}_X$ gauge group. Right-handed neutrinos are required to have the model anomaly free and explain the neutrino oscillation data. The heaviest scalar breaks the $U(1{)}_X$ gauge symmetry and the other extra scalar gives a pseudo scalar DM candidate. A pseudo scalar dark matter~(DM) is an interesting candidate as it naturally evades the stringent direct detection bounds due to its coupling structure. We study the phenomenology of this pseudo-scalar DM while considering several theoretical and experimental constraints. We find that in our model, there is a feasible parameter space, which satisfies by the DM lifetime bound, relic and direct detection constraints while respecting the colliders and other bounds.

   hep-phPLB(2023)·3 citations
5. 05*

   FCNC processes of charmed hadrons with invisible scalar

   Chao-Qiang Geng🇨🇳 · Geng Li🇨🇳

   We study the invisible scalar of $S$ in charmed meson and baryon decays with flavor-changing neutral currents (FCNCs) based on the model-independent effective Lagrangian between the quarks and invisible scalar. From the bounds of the coupling constants extracted from the recent BES III experiment on the decay of $D^0\to {\pi }^0\bar{\nu }\nu$, we predict that the decay branching ratios of $D^{+}\to {\pi }^{+}S$, $D_s^{+}\to K^{+}S$, ${\Lambda }_c\to pS$, ${\Xi }_c^{0(+)}\to {\Sigma }^{0(+)}S$, and ${\Xi }_c^0\to \Lambda S$ can be as large as $10.6,2.53,2.39,0.963,5.77$, and $2.92\times 10^{-4}$ with $m_{{}_S}\approx 1.1\mathrm{GeV}$, respectively. Some of these decay modes are accessible to the ongoing experiments, such as BES III, LHCb and Belle II, as well as the future ones, such as FCC-ee.

   hep-phPLB(2023)·4 citations
6. 06*

   Monopoles, vortices and their correlations in SU(3) gauge group

   N. Karimimanesh🇮🇷 · S. Deldar🇮🇷 · Z. Asmaee🇮🇷

   Topological defects such as monopoles, vortices and "chains"of the SU(3) gauge group are studied using its SU(2) subgroups. Two appropriate successive gauge transformations are applied to the subgroups to identify the chains of monopoles and vortices. Using the fact that the defects of the subgroups are not independent, the SU(3) defects and the Lagrangian are obtained and compared with the ones provided by Cho decomposition method. By comparing the results with the ones which have been obtained directly for the SU(3) gauge group, the relation and possible interactions between the defects of the subgroups are discussed.

   hep-phEPJC(2023)·1 citation
7. 07*

   A study of additional jet activity in top quark pair production and decay at the LHC

   Giuseppe Bevilacqua🇬🇷 · Michele Lupattelli🇩🇪 · Daniel Stremmer🇩🇪 · Malgorzata Worek🇩🇪

   We report on the calculation of the NLO QCD corrections to top quark pair production in association with two hard jets at the LHC. We take into account higher-order effects in both the production and decays of the top-quark pair. The latter are treated in the narrow width approximation and $t\bar{t}$ spin correlations are preserved throughout the calculation. This is the first time that such a complete study for this process is conducted at NLO in QCD. We present results for fiducial cross sections at the integrated and differential level. Furthermore, we investigate kinematic properties of the additional light jets and their distribution in the $pp\to t\bar{t}jj$ process. We examine jets in production and top-quark decays as well as the mixed contribution, where the two hardest non-$b$ jets are present simultaneously in the production and decay processes.

   hep-phhep-exPRD(2023)·18 citations
8. 08*

   ESFRAD. FORTRAN code for calculation of QED corrections to polarized ep-scattering by the electron structure function method

   A. Afanasev🇺🇸 · I. Akushevich🇺🇸 · A. Ilyichev🇧🇾 · N. Merenkov🇺🇦

   The main features of the electron structure function method for calculations of the higher order QED radiative effects to polarized deep-inelastic ep-scattering are presented. A new FORTRAN code ESFRAD based on this method was developed. A detailed quantitative comparison between the results of ESFRAD and other methods implemented in the codes POLRAD and RADGEN for calculation of the higher order radiative corrections is performed.

   hep-ph3 citations
9. 09*

   Mass spectra of neutral mesons $K_0,{\pi }_0,\eta ,{\eta }^{\prime }$ at finite magnetic field, temperature and baryon chemical potential

   Jie Mei🇨🇳 · Tao Xia🇨🇳 · Shijun Mao🇨🇳

   The mass spectra of neutral mesons $K_0,{\pi }_0,\eta ,{\eta }^{\prime }$ on temperature-quark chemical potential $(T-\mu )$ plane in the presence of a constant magnetic field is investigated in the $SU(3)$ NJL model. As a Goldstone boson of chiral symmetry breaking, the mass of $K_0$ meson increases with temperature and/or quark chemical potential, and we observe two kinds of mass jumps of $K_0$ meson in media, which is induced by the mass jump of constituent quarks and the magnetic field, respectively. Due to the breaking of isospin symmetry between $u$ and $d$ quarks in magnetic fields, the mixing of ${\pi }_0-\eta -{\eta }^{\prime }$ mesons occurs and this leads to rich structures of their mass spectra. For instance, ${\pi }_0$ mass is influenced by the strange quark. There appear the change of increase ratio of ${\pi }_0$ mass at high $\mu$ and vanishing $T$ and the ${\pi }_0$ mass jump crossing over the threshold of two times of strange quark mass at finite $T$ and $\mu$. The mass ordering of ${\pi }_0,\eta ,{\eta }^{\prime }$ mesons varies in media, due to their mass jumps, which are induced by the mass jump of constituent quarks or the magnetic field.

   hep-phPRD(2023)·25 citations
10. 10*

    Gravitational waves and dark matter from classical scale invariance

    Valentin V. Khoze🇬🇧 · Daniel L. Milne🇬🇧

    In this paper we consider a minimal classically conformal U(1) model of fermionic dark matter. We calculate the one loop effective potential which generates the mass scale quantum mechanically via dimensional transmutaion in the spirit of Gildener and Weinberg, and examine the effects of the new dark sector on the Standard Model Higgs as well as how the dark fermions receive a mass and can produce the observed relic abundance. We then consider constraints on the model coming from collider and direct detection experiments before calculating the thermal effects on the potential in the early universe. We examine the nature and conditions for a strongly first order phase transition in our model and calculate the associated gravitational wave signal and compare to the sensitivities of current and proposed experiments.

    hep-phPRD(2023)·27 citations
11. 11*

    Associated production of a $W$ boson and massive bottom quarks at next-to-next-to-leading order in QCD

    Luca Buonocore🇨🇭 · Simone Devoto🇮🇹 · Stefan Kallweit🇮🇹 · Javier Mazzitelli🇨🇭 · Luca Rottoli🇨🇭 · Chiara Savoini🇨🇭

    We present the first calculation for the hadroproduction of a $W$ boson in association with a massive bottom ($b$) quark-antiquark pair at next-to-next-to-leading order (NNLO) in QCD perturbation theory. We exploit the hierarchy between the $b$ quark mass and the characteristic energy scale of the process to obtain a reliable analytic expression for the two-loop virtual amplitude with three massive legs, starting from the corresponding result available for massless bottom quarks. The use of massive $b$ quarks avoids the ambiguities associated with the correct flavour assignment in massless calculations, paving the way to a more realistic comparison with experimental data. We present phenomenological results considering proton-proton collisions at centre-of-mass energy $\sqrt{s}=13.6$ TeV for inclusive $Wb\bar{b}$ production and within a fiducial region relevant for the associated production of a $W$ boson and a Higgs boson decaying into a $b\bar{b}$ pair, for which $Wb\bar{b}$ production represents one of the most relevant backgrounds. We find that the NNLO corrections are substantial and that their inclusion is mandatory to obtain reliable predictions.

    hep-phhep-exPRD(2023)·54 citations
12. 12*

    Dark matter implications of the neutron anomaly

    Leonardo Darini🇮🇹

    Motivated by the neutron decay anomaly, we reconsider the neutron decay model $n\to \chi \chi \chi$, where the new species $\chi$ plays the role of dark matter. We precisely compute the $\bar{\chi }n\to \chi \chi$ rate finding that fitting the anomaly compatibly with all bounds needs two ''generations'' of the $\chi$ particle.

    hep-phEPJC(2023)·7 citations
13. 13*

    Renormalisation group effects on SMEFT interpretations of LHC data

    Rafael Aoude🇧🇪 · Fabio Maltoni🇧🇪 · Olivier Mattelaer🇧🇪 · Claudio Severi🇬🇧 · Eleni Vryonidou🇬🇧

    We explore the impact of Renormalisation Group (RG) effects in the Standard Model Effective Field Theory (SMEFT) interpretations of LHC measurements. We implement the RG running and mixing for the Wilson coefficients as obtained from the one-loop anomalous dimension matrix in the SMEFT into a Monte Carlo generator. This allows to consistently predict and combine in global fits collider observables characterised by different scales. As a showcase, we examine the impact of RG running in the strong coupling on the SMEFT predictions for $t\bar{t}$ production cross sections and differential distributions as well as on the bounds on the Wilson coefficients that can be obtained from current LHC data.

    hep-phJHEP(2023)·50 citations
14. 14*

    Constraining Vector Dark Matter with Neutrino experiments

    Dawid Brzeminski🇺🇸 · Saurav Das🇺🇸 · Anson Hook🇺🇸 · Clayton Ristow🇺🇸

    Vector Dark Matter (VDM) that couples to lepton flavor ($L_e$, $L_{\mu }$, $L_{\tau }$) acts similarly to a chemical potential for the neutrino flavor eigenstates and modifies neutrino oscillations. VDM imparts unique signatures such as time and directional dependence with longer baselines giving better sensitivity. We use the non-observation of such a signal at Super-Kamiokande to rule out the existence of VDM in a region of parameter space several orders of magnitude beyond other constraints and show the projected reach of future experiments such as DUNE.

    hep-phastro-ph.COJHEP(2023)·20 citations
15. 15*

    Present and Future constraints on Secluded Dark Matter in the Galactic Halo with TeV Gamma-ray Observatories

    Guilherme Fortes🇧🇷 · Farinaldo Queiroz🇧🇷 · Clarissa Siqueira🇧🇷 · Aion Viana🇧🇷

    The dark matter relic density may be governed by the presence of new mediators that connect the dark matter field with the Standard Model particles. When the dark matter particle mass is larger than the mediator's, the pair production of mediators is kinematically open. This setup is known in the literature as secluded dark matter. Motivated by the appearance of secluded dark matter in several model building endeavours, we investigate the sensitivity of TeV gamma-ray instruments in the Southern Hemisphere namely, H.E.S.S., CTA, and SWGO to secluded dark matter annihilating in the Galactic Halo. We exploit the complementarity aspects of these detectors to find restrictive bounds on the annihilation cross-section for different annihilation channels. In particular, for a dark matter particle mass of $2$~TeV, H.E.S.S. is able to constraint $⟨\sigma v⟩\ge 4\times 10^{-26}{\mathrm{cm}}^3{\mathrm{s}}^{-1}$ at 95\% confidence level for the $4q$ and $4\tau$ channel, while CTA will be sensitive to $⟨\sigma v⟩\ge 7\times 10^{-27}{\mathrm{cm}}^3{\mathrm{s}}^{-1}$ and SWGO $⟨\sigma v⟩\ge 6\times 10^{-27}{\mathrm{cm}}^3{\mathrm{s}}^{-1}$ for the $4\tau$ channel, both well below the thermal relic cross-section. In fact, the combination of CTA and SWGO will be able to probe cross-sections below the thermal relic value for dark matter particles in the whole mass range between 100 GeV and 100 TeV in the $4q$ and $4\tau$ channels, and between 100 GeV and $\sim$40 TeV in the $4b$ channel.

    hep-phastro-ph.HEJCAP(2023)·11 citations
16. 16*

    Lund multiplicity in QCD jets

    Rok Medves🇬🇧 · Alba Soto-Ontoso🇨🇭 · Gregory Soyez🇫🇷

    We compute the average Lund multiplicity of high-energy QCD jets. This extends an earlier calculation, done for event-wide multiplicity in $e^{+}{e}^{-}$ collisions [arxiv:2205.02861], to the large energy range available at the LHC. Our calculation achieves next-to-next-to-double logarithmic (NNDL) accuracy. Our results are split into a universal collinear piece, common to the $e^{+}{e}^{-}$ calculation, and a non-universal large-angle contribution. The latter amounts to 10-15% of the total multiplicity. We provide accurate LHC predictions by matching our resummed calculation to fixed-order NLO results and by incorporating non-perturbative corrections via Monte Carlo simulations. Including NNDL terms leads to a 50% reduction of the theoretical uncertainty, with non-perturbative corrections remaining below 5% down to transverse momentum scales of a few GeV. This proves the suitability of Lund multiplicities for robust theory-to-data comparisons at the LHC.

    hep-phJHEP(2023)·16 citations
17. 17*

    Resurgence of the Effective Action in Inhomogeneous Fields

    Gerald V. Dunne🇺🇸 · Zachary Harris🇺🇸

    We show how background field inhomogeneities modify the non-perturbative structure of the effective action. The simple Borel poles of the Euler-Heisenberg effective action become branch points, and new branch points also appear, indicating new non-perturbative effects. This information is resurgently encoded in the perturbative weak field expansion, and becomes physically significant for strongly inhomogeneous fields. We also show that resurgent extrapolation methods permit the decoding of a surprising amount of non-perturbative information from a relatively modest amount of perturbative input, enabling accurate analytic continuations from weak field to strong field, and of a spatially dependent magnetic background to a time dependent electric background. These extrapolations are far superior to standard WKB and locally constant field approximations.

    ↳ hep-thhep-phmath-phmath.MPPRD(2023)·15 citations
18. 18*

    Experimental test of Non-Commutative Quantum Gravity by VIP-2 Lead

    Kristian Piscicchia🇮🇹 · Andrea Addazi🇨🇳 · Antonino Marciano🇮🇹 · Massimiliano Bazzi🇮🇹 · Michael Cargnelli🇦🇹 · Alberto Clozza🇮🇹 · Luca De Paolis🇮🇹 · Raffaele Del Grande🇮🇹 · Carlo Guaraldo🇮🇹 · Mihail Antoniu Iliescu🇮🇹 · Matthias Laubenstein🇮🇹 · Johann Marton🇦🇹 and 9 other authors

    Pauli Exclusion Principle (PEP) violations induced by space-time non-commutativity, a class of universality for several models of Quantum Gravity, are investigated by the VIP-2 Lead experiment at the Gran Sasso underground National Laboratory of INFN. The VIP-2 Lead experimental bound on the non-commutative space-time scale $\Lambda$ excludes $\theta$-Poincaré far above the Planck scale for non vanishing ``electric-like" components of ${\theta }_{\mu \nu }$, and up to $6.9\cdot 10^{-2}$ Planck scales if they are null. Therefore, this new bound represents the tightest one so far provided by atomic transitions tests. This result strongly motivates high sensitivity underground X-ray measurements as critical tests of Quantum Gravity and of the very microscopic space-time structure.

    ↳ hep-thgr-qchep-exhep-phPRD(2023)·19 citations
19. 19*

    Isospin-breaking corrections to light leptonic decays in lattice QCD+QED at the physical point

    Peter Boyle🇺🇸 · Matteo Di Carlo🇬🇧 · Felix Erben🇬🇧 · Vera Gülpers🇬🇧 · Maxwell T. Hansen🇬🇧 · Tim Harris🇬🇧 · Nils Hermansson-Truedsson🇨🇭 · Raoul Hodgson🇬🇧 · Andreas Jüttner🇬🇧 · Fionn Ó hÓgáin🇬🇧 · Antonin Portelli🇬🇧 · James Richings🇬🇧 · Andrew Z. N. Yong🇬🇧

    We report on the physical-point RBC/UKQCD calculation of the leading isospin-breaking corrections to light-meson leptonic decays. This is highly relevant for future precision tests in the flavour physics sector, in particular the first-row unitarity of the Cabibbo-Kobayashi-Maskawa matrix containing the elements $V_{us}$ and $V_{ud}$. The simulations were performed using Domain-Wall fermions for $2+1$ flavours, and with isospin-breaking effects included perturbatively in the path integral through order $\alpha$ and $(m_u-m_d)/{\Lambda }_{\mathrm{QCD}}$. We use QED${}_{\mathrm{L}}$ for the inclusion of electromagnetism, and discuss here the non-locality of this prescription which has significant impact on the infinite-volume extrapolation.

    ↳ hep-lathep-phPoS(2023)·3 citations
20. 20*

    Learning the Composition of Ultra High Energy Cosmic Rays

    Blaz Bortolato🇸🇮 · Jernej F. Kamenik🇸🇮 · Michele Tammaro🇸🇮

    We apply statistical inference on the Pierre Auger Open Data to discern for the first time the full mass composition of cosmic rays at different energies. Working with longitudinal electromagnetic profiles of cosmic ray showers, in particular their peaking depths $X_{\max }$, we employ central moments of the $X_{\max }$ distributions as features to discriminate between different shower compositions. We find that already the first few moments entail the most relevant information to infer the primary cosmic ray mass spectrum. Our approach, based on an unbinned likelihood, allows us to consistently account for sources of statistical uncertainties due to finite datasets, both measured and simulated, as well as systematic effects. Finally, we provide a quantitative comparison of different high energy hadronic interaction models available in the atmospheric shower simulation codes.

    ↳ astro-ph.HEhep-phPRD(2023)·6 citations
21. 21*

    The Gerasimov-Drell-Hearn sum-rule with nuclear targets

    Steven D. Bass🇵🇱 · Paolo Pedroni🇮🇹 · Andreas Thomas🇩🇪

    Hadron properties are modified when the hadron is embedded in a nuclear medium. Here we discuss the Gerasimov-Drell-Hearn, GDH, sum rule for polarised photoproduction from a polarised nucleon within a polarised nuclear target. Strong enhancement is expected with the suppression of the proton and nucleon resonance masses and enhancement of the proton's anomalous magnetic moment in medium. This could be tested in polarised photoproduction experiments with interesting targets being polarised deuterons, ${}^3$He, ${}^6$Li and ${}^7$Li. The largest contribution to the GDH sum rule comes from the $\Delta$ resonance excitation. In existing data with polarised deuterons and ${}^3$He the $\Delta$ excitation is shifted to slightly lower energy when compared to model predictions where the $\Delta$ is treated with its free mass.

    ↳ nucl-thhep-phnucl-exEPJA(2023)·4 citations
22. 22*

    Charmonium-like states with $J^P=1^{+}$ and isospin 1

    Mitja Sadl🇸🇮 · Sara Collins🇩🇪 · M. Padmanath🇩🇪 · Sasa Prelovsek🇸🇮

    Many mesons with properties incompatible with a $\bar{c}c$ structure have already been discovered, e.g. the $Z_c$ mesons with isospin 1. We investigate the spectrum of exotic charmonium-like mesons using lattice QCD. The focus is on $\bar{c}c\bar{q}q$ states with $J^{PC}=1^{+\pm }$ and isospin 1. This is the first study of four-quark states with these quantum numbers, a non-zero total momentum and two different lattice volumes. We extract the energy levels and determine the scattering length for $D{\bar{D}}^{\ast }$ scattering close to the threshold using Lüscher's formalism. Our preliminary results show that the energy shifts for eigenstates dominated by $D{\bar{D}}^{\ast }$ are very small in the $1^{++}$ channel and consistent with zero in the $1^{+-}$ channel.

    ↳ hep-lathep-phPoS(2023)·2 citations
23. 23*

    Probing Lorentz-violating electrodynamics with CMB polarization

    Luca Caloni🇮🇹 · Serena Giardiello🇮🇹 · Margherita Lembo🇮🇹 · Martina Gerbino🇮🇹 · Giulia Gubitosi · Massimiliano Lattanzi🇮🇹 · Luca Pagano🇮🇹

    We perform a comprehensive study of the signatures of Lorentz violation in electrodynamics on the Cosmic Microwave Background (CMB) anisotropies. In the framework of the minimal Standard Model Extension (SME), we consider effects generated by renormalizable operators, both CPT-odd and CPT-even. These operators are responsible for sourcing, respectively, cosmic birefringence and circular polarization. We propagate jointly the effects of all the relevant Lorentz-violating parameters to CMB observables and provide constraints with the most recent CMB datasets. We bound the CPT-even coefficient to $k_{F,E+B}<2.31\times 10^{-31}$ at 95\% CL. This improves previous CMB bounds by one order of magnitude. The limits we obtain on the CPT-odd coefficients, i.e. $|k_{(V)00}^{(3)}|<1.54\times 10^{-44}\mathrm{GeV}$ and $|{\mathbf{k}}_{\mathbf{AF}}|<0.74\times 10^{-44}\mathrm{GeV}$ at 95\% CL, are respectively one and two orders of magnitude stronger than previous CMB-based limits, superseding also bounds from non-CMB searches. This analysis provides the strongest constraints to date on CPT-violating coefficients in the minimal SME from CMB searches.

    ↳ astro-ph.COgr-qchep-phJCAP(2023)·33 citations
24. 24*

    Letter of Intent: Muonium R&D/Physics Program at the MTA

    C. Gatto🇮🇹 · C. Izzo🇺🇸 · C. J. Johnstone🇺🇸 · D. M. Kaplan🇺🇸 · K. R. Lynch🇺🇸 · D. C. Mancini🇺🇸 · A. Mazzacane🇺🇸 · B. McMorran🇺🇸 · J. P. Miller🇺🇸 · J. D. Phillips🇺🇸 · T. J. Phillips🇺🇸 · R. D. Reasenberg🇺🇸 · T. J. Roberts🇺🇸 · J. Terry🇺🇸

    With the planned turn-on of the PIP-II 800 MeV superconducting proton linac, Fermilab will potentially become the world's best laboratory at which to carry out fundamental muon measurements, sensitive searches for symmetry violation, and precision tests of theory. In preparation, we propose to develop the techniques that will be needed. An R&D and physics program is proposed at the Fermilab MeV Test Area to use the existing 400 MeV Linac to demonstrate the efficient production of a slow muonium beam using ${\mu }^{+}$ stopped in a ~100-$\mu$m-thick layer of superfluid helium, and to use that beam to measure muonium gravity.

    ↳ physics.ins-dethep-exhep-ph3 citations
25. 25*

    BUQEYE Guide to Projection-Based Emulators in Nuclear Physics

    C. Drischler🇺🇸 · J.A. Melendez🇺🇸 · R.J. Furnstahl🇺🇸 · A.J. Garcia🇺🇸 · Xilin Zhang🇺🇸

    The BUQEYE collaboration (Bayesian Uncertainty Quantification: Errors in Your EFT) presents a pedagogical introduction to projection-based, reduced-order emulators for applications in low-energy nuclear physics. The term emulator refers here to a fast surrogate model capable of reliably approximating high-fidelity models. As the general tools employed by these emulators are not yet well-known in the nuclear physics community, we discuss variational and Galerkin projection methods, emphasize the benefits of offline-online decompositions, and explore how these concepts lead to emulators for bound and scattering systems that enable fast & accurate calculations using many different model parameter sets. We also point to future extensions and applications of these emulators for nuclear physics, guided by the mature field of model (order) reduction. All examples discussed here and more are available as interactive, open-source Python code so that practitioners can readily adapt projection-based emulators for their own work.

    ↳ nucl-thhep-lathep-phphysics.data-anFront.in Phys.(2022)·49 citations
26. 26*

    Salvaging Power-Law Inflation through Warming

    M. Alhallak (Damascus Univ.)🇸🇾 · N. Chamoun (HIAST)🇸🇾 · M. S. Eldaher (Damascus Univ.)🇸🇾

    Power-Law inflation with scale factor $a\propto t^m$ is investigated in the context of warm inflation. The treatment is performed in the weak and strong dissipation limits. In addition, we discuss the three common cases for the thermal dissipation coefficient $\Gamma (T)$. We compare the theoretical results of the Power-Law model within warm inflation with the observational constraints from Planck $2018$ and BICEP/Keck 2018, as presented by the tensor-to-scalar ratio $r$ and spectral index $n_s$. The model results agree largely with the observations for most of the $\Gamma (T)$ cases. Furthermore, in order to address the problem of exiting the inflationary epoch, we suggest a perturbed modification to the power-law definition so that it becomes affine, and find that this small change indicates a way for having an exit scenario with a suitable e-foldings number. Finally, we examine this perturbation ansatz within the context of cold inflation with exponential potential, and we find that it can accommodate the observational data with sufficient e-foldings. Our study suggests that the power-law inflation and the exponential potential, in both warm and cold inflation contexts, can in principle be made consistent with the observations and with a possible graceful exit.

    ↳ astro-ph.COhep-phEPJC(2023)·10 citations
27. 27*

    Non-invertible symmetries in axion electrodynamics

    Ryo Yokokura🇯🇵

    We study non-invertible global symmetries in $(3+1)$-dimensional axion electrodynamics with a massless axion and a massless photon. In addition to a previously known non-invertible 0-form shift symmetry of the axion, we find a non-invertible 1-form symmetry associated with the equation of motion for the photon. Correlation functions of non-invertible symmetry defects lead to invertible 1- and 2-form symmetry defects associated with Bianchi identities for the axion and photon. In terms of the correlation functions, we discuss several phenomena for extended objects, such as induced fractional electric charges on axionic domain walls and fractional axionic operators on intersection points of magnetic flux tubes from the viewpoint of global symmetries.

    ↳ hep-thcond-mat.str-elhep-ph80 citations
28. 28*

    Complexified spinor fields in operator form

    Slobodan Prvanovic🇷🇸

    The formalism of quantum field theory in operator form, based on the anti self-adjoint operators of the imaginary coordinate and momentum and the self-adjoint operators of the real coordinate, momentum, energy and time, is used in considerations of the spinor fields and related topics. The unitary representation of the Lorentz boosts in the spin-orbital space is given. The operators that mirror-reflect the spin are introduced and then used in discussion of the spin parity. The conclusion that the spin is odd is used in the analyze of the parity violation in the cobalt-60 beta decay and it is found that the parity is not broken. The explanation why there are only right-handed antineutrinos and left-handed neutrinos is offered on the basis of appropriate treatment of the influence of spin on momentum. The inversion of time is treated within the framework of the operators of time and energy and this symmetry is represented in a way that respects the Schrödinger equation and this is done by the Wick rotations of involved operators and vectors of the complexified formalism.

    ↳ physics.gen-phhep-phIndian J.Phys.(2026)·0 citations

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