Fri·Jul 29, 2022Friday·July 29, 2022

1. 01*

   NNLO interpolation grids for jet production at the LHC

   D. Britzger🇩🇪 · A. Gehrmann-De Ridder🇨🇭 · T. Gehrmann🇨🇭 · E.W.N. Glover🇬🇧 · C. Gwenlan🇬🇧 · A. Huss🇨🇭 · J. Pires🇵🇹 · K. Rabbertz🇩🇪 · D. Savoiu🇩🇪 · M.R. Sutton🇬🇧 · J. Stark🇩🇪

   Fast interpolation-grid frameworks facilitate an efficient and flexible evaluation of higher-order predictions for any choice of parton distribution functions or value of the strong coupling ${\alpha }_s$. They constitute an essential tool for the extraction of parton distribution functions and Standard Model parameters, as well as studies of the dependence of cross sections on the renormalisation and factorisation scales. The APPLfast project provides a generic interface between the parton-level Monte Carlo generator NNLOJET and both the APPLgrid and the fastNLO libraries for the grid interpolation. The extension of the project to include hadron-hadron collider processes at next-to-next-to-leading order in perturbative QCD is presented, together with an application for jet production at the LHC.

   hep-phEPJC(2022)·44 citations
2. 02*

   Exclusive photo- and electroproduction of excited light vector mesons via holographic model

   Cheryl Henkels🇧🇷 · Emmanuel G. de Oliveira🇧🇷 · Roman Pasechnik🇸🇪 · Haimon Trebien🇧🇷

   In this paper, we study total and differential observables of electro- and photoproduction of light $\rho$, $\omega$ and $\varphi$ mesons as functions of the center-of-mass energy of the $\gamma p$ collision and momentum transfer squared $|t|$. The corresponding vector mesons wave functions have been computed in the framework of relativistic AdS/QCD holographic approach. A satisfactory description of all available data on ground-state $\rho (1S)$, $\omega (1S)$ and $\varphi (1S)$ mesons production cross sections has been achieved in the color dipole picture. Finally, the key observables of excited $\rho (2S)$, $\omega (2S)$ and $\varphi (2S)$ states production in ${\gamma }^{(\ast )}p$ collisions have been presented here using a common wave function formalism. This study reveals a large theoretical uncertainty coming from the modeling of the partial dipole amplitude in the nonperturbative kinematical domain. Hence, the latter could benefit from future measurements of photoproduction of the excited states.

   hep-phEPJC(2023)·7 citations
3. 03*

   Contact interaction analysis of octet baryon axialvector and pseudoscalar form factors

   Peng Cheng🇨🇳 · Fernando E. Serna🇧🇷 · Zhao-Qian Yao🇨🇳 · Chen Chen🇨🇳 · Zhu-Fang Cui🇨🇳 · Craig D. Roberts🇨🇳

   Octet baryon axial, induced pseudoscalar, and pseudoscalar form factors are computed using a symmetry-preserving treatment of a vector$\times$vector contact interaction (SCI), thereby unifying them with an array of other baryon properties and analogous treatments of semileptonic decays of pseudoscalar mesons. The baryons are treated as quark--plus--interacting-diquark bound states, whose structure is obtained by solving a Poincaré-covariant Faddeev equation. The approach is marked by algebraic simplicity, involves no free parameters, and since it is symmetry preserving, all consequences of partial conservation of the axial current are manifest. It is found that SCI results are consistent with only small violations of SU$(3)$-flavour symmetry, an outcome which may be understood as a dynamical consequence of emergent hadron mass. The spin-flavour structure of the Poincaré-covariant baryon wave functions is expressed in the presence of both flavour-antitriplet scalar diquarks and flavour-sextet axialvector diquarks and plays a key role in determining all form factors. Considering neutral axial currents, SCI predictions for the flavour separation of octet baryon axial charges and, therefrom, values for the associated SU$(3)$ singlet, triplet, and octet axial charges are obtained. The results indicate that at the hadron scale, ${\zeta }_{\mathcal{H}}$, valence degrees-of-freedom carry roughly 50% of an octet baryon's total spin. Since there are no other degrees-of-freedom at ${\zeta }_{\mathcal{H}}$, the remainder may be associated with quark+diquark orbital angular momentum.

   hep-phhep-exhep-latnucl-ex+1PRD(2022)·26 citations
4. 04*

   Possible ${\Lambda }_c{\bar{\Lambda }}_c$ molecular states and their productions in nulceon-antinulceon collision

   Lin-Qing Song🇨🇳 · Dan Song🇨🇳 · Jun-Tao Zhu🇨🇳 · Jun He

   In this work, a study of possible molecular states from the ${\Lambda }_c{\bar{\Lambda }}_c$ interaction and their productions in nucleon-antinucleon collision is performed in a quasipotential Bethe-Salpeter equation approach. Two bound states with quantum numbers $J^{PC}=0^{-+}$ and $1^{--}$ are produced with almost the same binding energy from the ${\Lambda }_c{\bar{\Lambda }}_c$ interaction which is described by the light meson exchanges. However, the result does not support the assignment of experimentally observed $Y(4630)$ as a ${\Lambda }_c{\bar{\Lambda }}_c$ molecular state because it is hard to obtain a peak near experimental mass of the $Y(4630)$ which is far above the ${\Lambda }_c{\bar{\Lambda }}_c$ threshold. The possibility to search these states in nucleon-antinucleon collision is studied by including couplings to $N\bar{N}$ and $D^{(\ast )}{\bar{D}}^{(\ast )}$ channels. The peaks can be found obviously near the ${\Lambda }_c{\bar{\Lambda }}_c$ threshold in the $D^{\ast }{\bar{D}}^{\ast }$ channel at an order of amplitude of 10 $\mu$b. Too small width of state with $0^{-+}$ may lead to the difficulty to be observed in experiment. Based on the results in the current work, search for the ${\Lambda }_c{\bar{\Lambda }}_c$ molecular state with $1^{--}$ is suggested in process $N\bar{N}\to D^{\ast }{\bar{D}}^{\ast }$, which is accessible at $\bar{\mathrm{P}}\mathrm{ANDA}$.

   hep-phnucl-thPLB(2022)·15 citations
5. 05*

   Multichannel decay: alternative derivation of the $i$-th channel decay probability

   Francesco Giacosa🇵🇱

   In the study of decays, it is quite common that an unstable quantum state/particle has multiple distinct decay channels. In this case, besides the survival probability $p(t)$, also the probability $w_i(t)$ that the decay occurs between $(0,t)$ in the $i$-th channel is a relevant object. The general form of the function $w_i(t)$ was recently presented in PLB \textbf{831} (2022), 137200. Here, we provide a novel and detailed `joint' derivation of both $p(t)$ and $w_i(t)$. As it is well known, $p(t)$ is not an exponential function; similarly, $w_i(t)$ is also not such. In particular, the ratio $w_i/w_j$ (for $i\ne j)$ is not a simple constant, as it would be in the exponential limit. The functions $w_i(t)$ and their mutual ratios may therefore represent a novel tool to study the non-exponential nature of the decay law.

   hep-phquant-phActa Phys.Polon.A(2022)·1 citation
6. 06*

   Generalized Matter Parities from Finite Modular Symmetries

   Tatsuo Kobayashi🇯🇵 · Satsuki Nishimura🇯🇵 · Hajime Otsuka🇯🇵 · Morimitsu Tanimoto🇯🇵 · Kei Yamamoto🇯🇵

   We classify a supersymmetric extension of the Standard Model by discrete symmetries originating from finite modular symmetries ${\Gamma }_N$. Since all the couplings in supersymmetric theories of finite modular symmetries ${\Gamma }_N$ are described by holomorphic modular forms with even modular weights, renormalizable and non-renormalizable operators such as baryon- and/or lepton-number violating operators are severely constrained. From the modular transformation of matter multiplets with modular weight $1/M$, we find ${\mathbb{Z}}_{2M}$ symmetries, including the generalized baryon and lepton parities, $R$-parity, ${\mathbb{Z}}_3$ baryon triality and ${\mathbb{Z}}_6$ proton hexality. Such ${\mathbb{Z}}_{2M}$ symmetries are enlarged to ${\mathbb{Z}}_{2M}⋊{\mathbb{Z}}_2^{\text{CP}}$ symmetries together with the CP transformation.

   hep-phhep-thPTEP(2023)·6 citations
7. 07*

   $N\bar{N}$ production in $e^{+}{e}^{-}$ annihilation near the threshold revisited

   A.I. Milstein🇷🇺 · S.G. Salnikov🇷🇺

   Production of $p\bar{p}$ and $n\bar{n}$ pairs in $e^{+}{e}^{-}$ annihilation near the threshold of the process is discussed with account for the new experimental data appeared recently. Since a significant part of these new data was obtained at energies noticeably exceeding the threshold, we also take into account the form factor describing the amplitude of $N\bar{N}$ pair production at small distances. The effective optical potential, which describes a sharp dependence of the $N\bar{N}$ production cross sections near the threshold, consists of the central potential for $S$ and $D$ waves and the tensor potential. These potentials differ for the states with isospin $I=0$ and $I=1$ of $N\bar{N}$ pair. The optical potential describes well $N\bar{N}$ scattering phases, the cross sections of $p\bar{p}$ and $n\bar{n}$ production in $e^{+}{e}^{-}$ annihilation near the threshold, the electromagnetic form factors $G_E$ and $G_M$ for protons and neutrons, as well as the cross sections of the processes $e^{+}{e}^{-}\to 6\pi$ and $e^{+}{e}^{-}\to K^{+}{K}^{-}{\pi }^{+}{\pi }^{-}$.

   hep-phhep-exPRD(2022)·21 citations
8. 08*

   Gravitational waves and the Higgs mass

   Rui Santos🇵🇹

   One of the simplest models that allows for an electroweak (EW) strong first order phase transition (SFOPT) while having a Higgs with the observed mass of 125 GeV is the singlet extension of the Standard Model (SM). We discuss two different phases of a complex singlet extension of the SM. If the singlet has a zero vacuum expectation value (VEV) the situation is exactly the same as in the SM with no SFOPT. However, when the singlet acquires a VEV, a SFOPT is possible, giving rise to detectable gravitational waves (GWs) by LISA. The model also provides a dark matter candidate. We have studied the impact of the SM particle masses on the strength of the GWs spectrum. It turns out that the variation of the Higgs boson and top quark masses within one standard deviation of the experimentally measured value has a noticeable impact on GWs detectability prospects.

   hep-ph1 citation
9. 09*

   The decay ${\eta }^{\prime }\to \pi \rho$ in the chiral NJL model

   M. K. Volkov🇷🇺 · A. A. Pivovarov🇷🇺 · K. Nurlan🇷🇺

   The branching fraction of the decay ${\eta }^{\prime }\to \pi \rho$ is calculated in the chiral quark NJL model. The decay exists due to the mass difference between $u$- and $d$-quarks leading to ${\pi }^0-{\eta }^{{}^{\prime }}$ mixing. Two different approaches are applied: the approximate calculation of this process taking into account the transition ${\pi }^0-{\eta }^{{}^{\prime }}$ explicitly without dioganalisation and a more precise approach consisting in the diagonalisation of the singlet and octet states leading to the physical fields ${\pi }^0$, $\eta$ and ${\eta }^{{}^{\prime }}$. The obtained results are in satisfactory agreement with current experimental data.

   hep-phMod.Phys.Lett.A(2022)·0 citations
10. 10*

    Photoproduction of C-even quarkonia at EIC and EicC

    Yu Jia🇨🇳 · Zhewen Mo🇨🇳 · Jichen Pan🇨🇳 · Jia-Yue Zhang🇨🇳

    The ${\eta }_c$ photoproduction in $ep$ collision has long been proposed as an ideal process to probe the existence of odderon. In the current work, we systematically investigate the photoproduction of various $C$-even heavy quarkonia (exemplified by ${\eta }_{c(b)}$, and ${\chi }_{c(b)J}$ with $J=0,1,2$) via one-photon exchange channel, at the lowest order in ${\alpha }_s$ and heavy quark velocity in the context of NRQCD factorization. We find that the photoproduction rates of the $C$-even quarkonia through this mechanism are comparable in magnitude with that through the odderon-initiated mechanism, even in the Regge limit ($s\gg -t$), though the latter types of predictions suffers from considerable theoretical uncertainties. The future measurements of these types of quarkonium photoproduction processes in \texttt{EIC} and \texttt{EicC} are crucial to ascertain which mechanism plays the dominant role.

    hep-phhep-exPRD(2023)·14 citations
11. 11*

    Impact of string interactions on the space-time evolution of hadronic vertices

    Smita Chakraborty🇸🇪 · Leif Lönnblad🇸🇪

    We investigate the space-time picture of string evolution and hadron production in a fully string-based model for high energy collisions involving heavy ions. We find that although the density strings is quite large at the time of hadronization in a central heavy ion collision, the initial overlap between them right after the collisions is not necessarily large. We also find that when including string--string interactions using the so-called shoving model, the density of strings is decreased which should dampen the rapid increase in string tension in the rope hadronization with multiplicity that we found in a previous paper.

    hep-phhep-thEPJC(2023)·2 citations
12. 12*

    Endpoint factorization and next-to-leading power resummation of gluon thrust

    Martin Beneke🇩🇪 · Mathias Garny🇩🇪 · Sebastian Jaskiewicz🇬🇧 · Julian Strohm🇩🇪 · Robert Szafron🇺🇸 · Leonardo Vernazza🇮🇹 · Jian Wang🇨🇳

    Endpoint divergences in the convolution integrals appearing in next-to-leading-power factorization theorems prevent a straightforward application of standard methods to resum large logarithmic power-suppressed corrections in collider physics. We study the power-suppressed configuration of the thrust distribution in the two-jet region, where a gluon-initiated jet recoils against a quark-antiquark pair. With the aid of operatorial endpoint factorization conditions, we derive a factorization formula where the individual terms are free from endpoint divergences and can be written in terms of renormalized hard, (anti) collinear, and soft functions in four dimensions. This framework enables us to perform the first resummation of the endpoint-divergent SCET${}_{\mathrm{I}}$ observables at the leading logarithmic accuracy using exclusively renormalization-group methods.

    hep-phPoS(2022)·6 citations
13. 13*

    Leptogenesis and Dark Matter Through Relativistic Bubble Walls with Observable Gravitational Waves

    Debasish Borah🇮🇳 · Arnab Dasgupta🇺🇸 · Indrajit Saha🇮🇳

    We study a scenario where both dark matter and heavy right handed neutrino (RHN) responsible for leptogenesis acquire masses by crossing the relativistic bubble walls formed as a result of a TeV scale supercooled first order phase transition (FOPT). While this leads to a large out-of-equilibrium abundance of right handed neutrino inside the bubble sufficient to produce the required lepton asymmetry, the dark matter being lighter can still remain in equilibrium with its relic being set by subsequent thermal freeze-out. A classical conformal symmetry ensures the origin of mass via FOPT induced by a singlet scalar while also ensuring supercooling leading to enhanced gravitational wave amplitude within the sensitivity of the LISA experiment. A minimal scenario with three RHN, one inert scalar doublet and one singlet scalar as additional fields beyond the standard model is sufficient to realize this possibility which also favours inert RHN dark matter over inert scalar doublet.

    hep-phastro-ph.COJHEP(2022)·44 citations
14. 14*

    Do the Small Numbers in the Quark Mixing arise from New Physics?

    G.C. Branco🇵🇹 · José Filipe Bastos🇵🇹 · J. I. Silva-Marcos🇵🇹

    We put forward the conjecture that the small numbers in the $V_{\text{CKM}}$ matrix, are generated by physics beyond the Standard Model. We identify as small numbers $V_{ub}$ and the strength of CP violation, measured by $|\text{Im}Q|$, where $Q$ stands for a rephasing invariant quartet of $V_{\text{CKM}}$. We illustrate how the conjecture can be realised in the context of an extension of the Standard Model where an up-type vector-like quark is introduced leading to a realistic spectrum of quark masses and an effective $V_{\text{CKM}}$ in agreement with experiment.

    hep-phEPJC(2023)·2 citations
15. 15*

    NLO QCD corrections to inclusive semitauonic weak decays of heavy hadrons up to $1/m_b^3$

    Daniel Moreno🇩🇪

    This paper presents ${\alpha }_s$ corrections to the inclusive semitauonic $B\to X_c\tau {\bar{\nu }}_{\tau }$ decay width and leptonic invariant mass spectrum up to order $1/m_b^3$ in the heavy quark expansion. Analytical results with full dependence on the final-state quark and tau lepton masses are obtained. The results up to $1/m_b^2$ can be extrapolated to the $B\to X_u\tau {\bar{\nu }}_{\tau }$ decay by taking the limit of vanishing final-state quark mass.

    hep-phPRD(2022)·26 citations
16. 16*

    Simplified models of vector $SU(4)$ leptoquarks at the TeV

    Riccardo Barbieri🇮🇹 · Claudia Cornella🇩🇪 · Gino Isidori🇨🇭

    Assuming confirmation of the anomalies in semi-leptonic $B$-decays, their explanation in terms of the exchange of a massive vector leptoquark field, $U_{\mu }^a$, of charge 2/3, appears to require the inclusion of $U_{\mu }^a$ in the vector multiplet of the adjoint of Pati-Salam $SU(4)$, ${\mathcal{G}}_{\mu }^A$, as well as the introduction of vector-like fermions, $F_j$, in the fundamental of $SU(4)$. We consider simplified models characterised by the nature of the $SU(4)$ symmetry (global or local), by the number of vector-like fermions, and by the couplings of the Higgs boson to SM fermions (direct or induced by mixing with the vector-like fermions). In all cases, we implement a minimal breaking of a $U(2{)}_f^n$ flavour symmetry, with a single motivated exception. We then perform a global fit including the main observables sensitive to exchanges of the ${\mathcal{G}}_{\mu }^A$ at tree level and in loops dominated by logs insensitive to the UV completion.

    hep-phEPJC(2022)·9 citations
17. 17*

    Complete three-loop QCD corrections to leptonic width of vector quarkonium

    Feng Feng🇨🇳 · Yu Jia🇨🇳 · Zhewen Mo🇨🇳 · Jichen Pan🇨🇳 · Wen-Long Sang🇨🇳 · Jia-Yue Zhang🇨🇳

    Within the nonrelativistic QCD (NRQCD) factorization framework, we compute the order-${\alpha }_s^3$ perturbative corrections to the leptonic decay of the ${\rm Y}$ and $J/\psi$ with high numerical accuracy, at the lowest order in velocity expansion. We confirm the existing three-loop results in literature. Furthermore, we explicitly consider the complex-valued light-by-light (singlet) contributions. We for the first time also consider the finite charm quark mass effect for ${\rm Y}$ leptonic decay, and obtain a new piece of 3-loop contribution to the anomalous dimension related to the composite NRQCD bilinear of vector current that arises from the nonzero charm quark mass. Based on the complete three-loop NRQCD short-distance coefficients, we also present a comprehensive phenomenological analysis for ${\rm Y}(J/\psi )$ leptonic width.

    hep-ph18 citations
18. 18*

    Sensitivity of the ${\eta }^{(\prime )}\to {\pi }^0\gamma \gamma$ and ${\eta }^{\prime }\to \eta \gamma \gamma$ decays to a sub-GeV leptophobic $U(1{)}_B$ boson

    Rafel Escribano🇪🇸 · Sergi Gonzàlez-Solís🇺🇸 · Emilio Royo🇪🇸

    The sensitivity of the rare decays ${\eta }^{(\prime )}\to {\pi }^0\gamma \gamma$ and ${\eta }^{\prime }\to \eta \gamma \gamma$ to signatures of a leptophobic $B$ boson in the MeV-GeV mass range is analyzed in this work. By adding an explicit $B$-boson resonance exchange, $\eta \to B\gamma \to {\pi }^0\gamma \gamma$, to the Standard Model contributions from vector and scalar meson exchanges, and employing experimental data for the associated branching ratios, it allows us to improve the current constraints on the $B$-boson mass $m_B$ and coupling to Standard Model particles ${\alpha }_B$. From these constraints and the analysis of the available experimental $\gamma \gamma$ invariant mass distribution, we show that a $B$-boson signature in the resonant mass range $m_{{\pi }^0}\lesssim m_B\lesssim m_{\eta }$ is strongly suppressed and would be very difficult to experimentally identify, assuming that the leptophobic $B$ boson only decays to Standard Model particles. In contrast, the limits outside this mass window are less stringent and the corresponding $t$- and $u$-channel signatures may still be observable in the data, as it occurs with the nonresonant Standard Model $\rho$, $\omega$ and $\varphi$ meson exchanges. In addition, we make use of experimental data from the ${\eta }^{\prime }\to {\pi }^0\gamma \gamma$ and ${\eta }^{\prime }\to \eta \gamma \gamma$ decays to explore larger $B$-boson masses. Our results are relevant for the $B$-boson search programs at existing and forthcoming light-meson facilities, such as KLOE(-II) and Jefferson Lab Eta Factory experiments.

    hep-phhep-exnucl-thPRD(2022)·12 citations
19. 19*

    Core-collapse Supernova Constraint on the Origin of Sterile Neutrino Dark Matter via Neutrino Self-interactions

    Yu-Ming Chen🇨🇦 · Manibrata Sen🇩🇪 · Walter Tangarife🇺🇸 · Douglas Tuckler🇨🇦 · Yue Zhang🇨🇦

    Novel neutrino self-interaction can open up viable parameter space for the relic abundance of sterile-neutrino dark matter (S$\nu$DM). In this work, we constrain the relic target using core-collapse supernova which features the same fundamental process and a similar environment to the early universe era when S$\nu$DM is dominantly produced. We present a detailed calculation of the effects of a massive scalar mediated neutrino self-interaction on the supernova cooling rate, including the derivation of the thermal potential in the presence of non-zero chemical potentials from plasma species. Our results demonstrate that the supernova cooling argument can cover the neutrino self-interaction parameter space that complements terrestrial and cosmological probes.

    hep-phastro-ph.COastro-ph.SRJCAP(2022)·19 citations
20. 20*

    Searching for a Fifth Force with Atomic and Nuclear Clocks

    Dawid Brzeminski🇺🇸 · Zackaria Chacko🇺🇸 · Abhish Dev🇺🇸 · Ina Flood🇺🇸 · Anson Hook🇺🇸

    We consider the general class of theories in which there is a new ultralight scalar field that mediates an equivalence principle violating, long-range force. In such a framework, the sun and the earth act as sources of the scalar field, leading to potentially observable location dependent effects on atomic and nuclear spectra. We determine the sensitivity of current and next-generation atomic and nuclear clocks to these effects and compare the results against the existing laboratory and astrophysical constraints on equivalence principle violating fifth forces. We show that in the future, the annual modulation in the frequencies of atomic and nuclear clocks in the laboratory caused by the eccentricity of the earth's orbit around the sun may offer the most sensitive probe of this general class of equivalence principle violating theories. Even greater sensitivity can be obtained by placing a precision clock in an eccentric orbit around the earth and searching for time variation in the frequency, as is done in anomalous redshift experiments. In particular, an anomalous redshift experiment based on current clock technology would already have a sensitivity to fifth forces that couple primarily to electrons at about the same level as the existing limits. Our study provides well-defined sensitivity targets to aim for when designing future versions of these experiments.

    hep-phastro-ph.COphysics.atom-phPRD(2022)·26 citations
21. 21*

    Late time acceleration in Palatini gravity

    Ignatios Antoniadis🇫🇷 · Anthony Guillen🇫🇷 · Kyriakos Tamvakis🇬🇷

    We investigate the effect of the quadratic correction $\alpha R^2$ and non-minimal coupling $\xi {\varphi }^{2}R$ on a quintessence model with an exponential potential $V(\varphi )=M^4\exp (-\lambda \varphi )$ in the Palatini formulation of gravity. We use dynamical system techniques to analyze the attractor structure of the model and uncover the possible trajectories of the system. We find that the quadratic correction cannot play a role in the late time dynamics, except for unacceptably large values of the parameter $\alpha$; although it can play a role at early times. We find viable evolutions, from a matter-dominated phase to an accelerated expansion phase, with the dynamics driven by the non-minimal coupling. These evolutions correspond to trajectories where the field ends up frozen, thus acting as a cosmological constant.

    ↳ gr-qcastro-ph.COhep-phhep-thJHEP(2022)·12 citations
22. 22*

    Rare Charm Decays

    M. Destefanis🇮🇹

    Although the Standard Model has been firmly established, the search for physics beyond the SM is ongoing by investigating new experimental probes. Rare charm decays are a unique tool to access New Physics studies. The high luminosity achieved by the modern experiments and their high precision allow for rare charm decay studies in different scenarios. In this work, some of the most recent experimental results will be discussed in detail.

    ↳ hep-exhep-ph2 citations
23. 23*

    Supersymmetry and R-symmetries in Wess-Zumino models: properties and model dataset construction

    Zheng Sun🇨🇳

    The Nelson-Seiberg theorem and its extensions relate supersymmetry breaking and R-symmetries in Wess-Zumino models. But their applicability may be limited by previously found non-generic counterexamples. Constructing a dataset of R-symmetric Wess-Zumino models is useful for studying the occurrence of such counterexamples as well as other purposes. This work gives a pedagogical review on the basics of supersymmetry in (3+1)-dimensions, Wess-Zumino models and their supergravity extensions, the Nelson-Seiberg theorem and its extensions. We present a preliminary construction of the dataset of R-symmetric Wess-Zumino models with up to 5 chiral fields. Among 925 models in total, 20 of them with non-generic R-charges are counterexamples to both the Nelson-Seiberg theorem and its extensions. Thus the dataset gives an estimation of the accuracy of the field counting method based on these theorems. More constructions and applications of the dataset are expected in future work.

    ↳ hep-thhep-ph5 citations
24. 24*

    Non-equilibrium components in very low transverse momentum region in high-energy nuclear collisions

    Yuuka Kanakubo🇯🇵 · Yasuki Tachibana🇯🇵 · Tetsufumi Hirano🇯🇵

    We analyze Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV with a novel framework based on the dynamical core--corona picture that describes particle productions from both equilibrium and non-equilibrium components. We remark the possibility of the contribution from non-equilibrium components at very low transverse momentum ($p_T$) region and show that such contributions significantly affect $p_T$-integrated four-particle cumulants. These results strongly suggest the necessity of non-equilibrium components when one extracts properties of the quark-gluon plasma from experimental data using sophisticated dynamical models based on relativistic hydrodynamics.

    ↳ nucl-thhep-phnucl-exPRC(2022)·14 citations
25. 25*

    Hyperon physics at BESIII

    Liang Yan🇨🇳

    Using the largest $J/\psi$ and $\psi (3686)$ data samples collected at the BESIII experiment, the hyperon anti-hyperon pairs are generated in their quantum entangle system. The polarization of hyperon has been observed, which makes it possible to measure the decay parameters of hyperon and anti-hyperon precisely. The CP conservation observables have been estimated which is important to test the Standard Model. In the meanwhile, the branching fractions and angular distributions related to hyperon pair production have been measured.

    ↳ hep-exhep-ph0 citations
26. 26*

    Kinetic theory for massive spin-1 particles

    David Wagner🇩🇪 · Nora Weickgenannt🇩🇪 · Enrico Speranza🇺🇸

    We calculate the Wigner function for charged spin-1 particles in inhomogeneous classical electromagnetic fields, going to first order in a power series in $\hslash$. The Boltzmann equation for the scalar distribution function obtained from this formalism agrees with previous calculations for spin-1/2 particles. In particular, we recover a Mathisson force of twice the magnitude, correctly reflecting the higher dipole moment of vector mesons. Evolution equations for vector and tensor degrees of freedom are obtained, and global equilibrium is discussed.

    ↳ nucl-thhep-phActa Phys.Polon.Supp.(2023)·2 citations
27. 27*

    Gravitational-wave event rates as a new probe for dark matter microphysics

    Markus R. Mosbech🇦🇺 · Alexander C. Jenkins🇬🇧 · Sownak Bose🇬🇧 · Celine Boehm🇦🇺 · Mairi Sakellariadou🇬🇧 · Yvonne Y. Y. Wong🇦🇺

    We show that gravitational waves have the potential to unravel the microphysical properties of dark matter due to the dependence of the binary black hole merger rate on cosmic structure formation, which is itself highly dependent on the dark matter scenario. In particular, we demonstrate that suppression of small-scale structure -- such as that caused by interacting, warm, or fuzzy dark matter -- leads to a significant reduction in the rate of binary black hole mergers at redshifts $z\gtrsim 5$. This shows that future gravitational-wave observations will provide a new probe of physics beyond the $\Lambda$CDM model.

    ↳ astro-ph.COastro-ph.GAgr-qchep-phPRD(2023)·14 citations
28. 28*

    Distance between various discretized fermion actions

    Dian-Jun Zhao🇨🇳 · Gen Wang🇫🇷 · Fangcheng He🇨🇳 · Luchang Jin🇺🇸 · Peng Sun🇨🇳 · Yi-Bo Yang🇨🇳 · Kuan Zhang🇨🇳

    We present the leading order mixed-action effect ${\Delta }_{\mathrm{mix}}\equiv m_{\pi ,\mathrm{vs}}^2-\frac{m_{\pi ,\mathrm{vv}}^2+m_{\pi ,\mathrm{ss}}^2}{2}$ using HISQ, clover or overlap valence fermion actions on gauge ensembles using various sea fermion actions across a widely-used lattice spacing range $a\in [0.04,0.19]$~fm. The results suggest that ${\Delta }_{\mathrm{mix}}$ decreases as the fourth order of the lattice spacing on the gauge ensembles with dynamical chiral sea fermions, such as Domain wall or HISQ fermions. When a clover sea fermion action which has explicit chiral symmetry breaking is used in the ensemble, ${\Delta }_{\mathrm{mix}}$ can be much larger regardless of the valence fermion action used.

    ↳ hep-lathep-phPRD(2023)·8 citations
29. 29*

    Running vacuum versus Holographic dark energy: a cosmographic comparison

    Mehdi Rezaei🇮🇷 · Joan Sola Peracaula🇪🇸

    We perform a comparative study of different types of dynamical dark energy models (DDES) using the cosmographic method. Among the models being examined herein we have the Running Vacuum models (RVMs), which have demonstrated considerable ability to fit the overall cosmological data at a level comparable to the standard cosmological model, $\Lambda$CDM, and capable of alleviating the ${\sigma }_8$ and $H_0$ tensions. At the same time we address a variety of Holographic dark energy models (HDEs) with different options for the time (redshift)-varying model parameter $c=c(z)$. We deal with the HDEs under the double assumption of fixed and evolving holographic length scale and assess which one is better. Both types of DDEs (RVMs and HDEs) are confronted with the most robust cosmographic data available, namely the Pantheon sample of supernovae (SnIa), the baryonic acoustic oscillation data (BAOs) extracted from measurement of the power spectrum and bispectrum of the BOSS data release, and the cosmic chronometer measurements of the Hubble rate (CCHs) at different redshifts obtained from spectroscopic observations of passively evolving galaxies. Using these data samples we assess the viability of the mentioned DDEs and compare them with the concordance $\Lambda$CDM model. From cosmographic analysis we conclude that the RVMs fare comparably well to the $\Lambda$CDM, a fact which adds up more credit to their sound phenomenological status. In contrast, while some of the HDEs are favored using the current Hubble horizon as fixed holographic length, they become highly unfavoured in the more realistic case when the holographic length is dynamical and evolves as the Hubble horizon.

    ↳ astro-ph.COgr-qchep-phEPJC(2022)·20 citations
30. 30*

    Self-Gravity and Bekenstein-Hawking Entropy

    Yuki Yokokura🇯🇵

    We study the effect of self-gravity on entropy by directly solving the 4D semi-classical Einstein equation. In particular, we focus on whether the Bekenstein-Hawking formula holds when self-gravity is extremely strong. As an example, we consider a simple spherically symmetric static configuration consisting of many quanta and construct a self-consistent non-perturbative solution for $\hslash$ in which the entropy exactly follows the area law for many local degrees of freedom of any kind. This can be a candidate for black holes in quantum theory. It represents a compact dense configuration with near-Planckian curvatures, and the interior typically behaves like a local thermal state due to particle creation. Here, the information content is stored in the interior bulk, and the self-gravity plays an essential role in changing the entropy from the volume law to the area law. We finally discuss implications to black holes in quantum gravity and a speculative view of entropy as a gravitational charge.

    ↳ hep-thastro-ph.HEgr-qchep-ph+1NPB(2024)·8 citations
31. 31*

    Gauge symmetry breaking with fluxes and natural Standard Model structure from exceptional GUTs in F-theory

    Shing Yan Li🇺🇸 · Washington Taylor🇺🇸

    We give a general description of gauge symmetry breaking using vertical and remainder fluxes in 4D F-theory models. The fluxes can break a geometric gauge group to a smaller group and induce chiral matter, even when the larger group admits no chiral matter representations. We focus specifically on applications to realizations of the Standard Model gauge group and chiral matter spectrum through breaking of rigid exceptional gauge groups $E_7,E_6$, which are ubiquitous in the 4D F-theory landscape. Supplemented by an intermediate $\mathrm{SU}(5)$ group, these large classes of models give natural constructions of Standard Model-like theories with small numbers of generations of matter in F-theory.

    ↳ hep-thhep-phmath.AGJHEP(2022)·10 citations
32. 32*

    Relativistic Bohmian trajectories and Klein-Gordon currents for spin-0 particles

    M. Alkhateeb🇫🇷 · A. Matzkin🇫🇷

    It is generally believed that the de Broglie-Bohm model does not admit a particle interpretation for massive relativistic spin-0 particles, on the basis that particle trajectories cannot be defined. We show this situation is due to the fact that in the standard (canonical) representation of the Klein-Gordon equation the wavefunction systematically contains superpositions of particle and anti-particle contributions.\ We argue that by working in a Foldy-Wouthuysen type representation uncoupling the particle from the anti-particle evolutions, a positive conserved density for a particle and associated density current can be defined.\ For the free Klein-Gordon equation the velocity field obtained from this current density appears to be well-behaved and sub-luminal in typical instances. As an illustration, Bohmian trajectories for a spin-0 boson distribution are computed numerically for free propagation in situations in which the standard velocity field would take arbitrarily high positive and negative values.

    ↳ quant-phhep-phhep-thFound.Phys.(2022)·6 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.