Mon·Feb 6, 2023Monday·February 6, 2023

1. 01*

   Light Hybrid Meson Mixing and Phenomenology

   E.S. Swanson🇺🇸

   A simple constituent model of gluodynamics that is motivated by lattice field theory and the QCD Hamiltonian in Coulomb gauge is applied to descriptions of hybrid meson flavor mixing and vector hybrid configuration mixing. Good agreement with lattice gauge computations is obtained for flavor multiplet masses, while mixing angles are in approximate agreement, given large errors. The configuration mixing results are also in rough agreement with lattice NRQCD calculations. Thus the viability of constituent gluon models of hybrid hadrons and glueballs is supported. The results suggest that a flavor multiplet of vector hybrids should appear with masses of approximately 2100, 2200, and 2300 MeV and that the isovector vector hybrid decay constant is about 20 MeV. Similarly, the ${\pi }_1$ exotic hybrid should have isospin partner states near 1760 and 1900 MeV, and it is suggested that the recently seen ${\eta }_1$ hybrid signal is the latter state.

   hep-phhep-exPRD(2023)·17 citations
2. 02*

   Universality of Koba-Nielsen-Olesen scaling in QCD at high energy and entanglement

   Yizhuang Liu🇵🇱 · Maciej A. Nowak🇵🇱 · Ismail Zahed🇺🇸

   Using Mueller's dipole formalism for deep inelastic scattering in QCD, we formulate and solve the evolution for the generating function for the multiplicities of the produced particles, in hadronic processes at high energy. The solution for the multiplicities satisfies Koba-Nielsen-Olesen (KNO) scaling, with good agreement with the recently re-analyzed data from the H1 experiment at HERA (DESY), and the old ALEPH data for hadronic $Z$ decay at LEP (CERN). The same scaling function with KNO scaling, carries to the hadronic multiplicities from jets in electron-positron annihilation. This agreement is {\it a priori} puzzling, since in Mueller's dipole evolution, one accounts for virtual dipoles in a wave function, whereas in electron-positron annihilation, one describes cross-sections of real particles. We explain the origin of this similarity, pointing at a particular duality between the two processes. Finally, we interpret our results from the point of view of quantum entanglement between slow and fast degrees of freedom in QCD, and derive the entanglement entropy pertinent to electron-positron annihilation into hadronic jets.

   hep-phhep-exhep-thnucl-ex+119 citations
3. 03*

   The role of scalar and mass interactions in a relativistic model of the charmonium spectrum

   M. De Sanctis🇨🇴

   Lorentz scalar and mass interactions are studied in more detail in the framework of a reduced Dirac equation for heavy quark-antiquark mesons. A microscopic model for these interactions is proposed and analyzed. The charmonium mass spectrum is reproduced by means of two free parameters; a third parameter is fixed by means of a phenomenological hypothesis in accordance with the model.

   hep-phActa Phys.Polon.B(2023)·3 citations
4. 04*

   Majorana CP violating phases

   Chao-Shang Huang🇨🇳

   The two Majorana cp-violating phases can not be determined by experiments on neutrino oscillations. It is difficult even not possible almost to measure two Majorana cp-violating phases since they are only sensitive to lepton-number-violating processes. One must take some assumption on the structure of neutrino mass matrix and their flavor mixing mechanism hidden behind in phenomenological models in order to determine Majorana cp-violating phases. Two models on the symmetry of the neutrino mass matrix are proposed in this paper. The Majorana cp-violating phases and the effective Majorana neutrino mass $m_{ee}$ are computed in the two models. Using the limit of the absolute neutrino mass scale which is from cosmological observations, the numerical values of the Majorana cp-violating phases and the effective Majorana neutrino mass $m_{ee}$ are obtained.

   hep-phNPB(2025)·1 citation
5. 05*

   Consistency of New CDF-II W Boson Mass with 123-Model

   B. Ait Ouazghour🇲🇦 · R. Benbrik🇲🇦 · E. Ghourmin🇲🇦 · M. Ouchemhou🇲🇦 · L. Rahili🇲🇦

   Following the recent update measurement of the W boson mass performed by the CDF-II experiment at Fermilab which indicates $7\sigma$ deviation from the SM prediction. As a consequence, the open question is whether there are extensions of the SM that can carry such a remarkable deviation or what phenomenological repercussions this has. In this paper, we investigate what the theoretical constraints reveal about the \ott model. Also, we study the consistency of a CDF W boson mass measurement with the 123-model expectations, taking into account theoretical and experimental constraints. Both fit results of $S$ and $T$ parameters before and after $m_W^{\mathrm{CDF}}$ measurement are, moreover, considered in this study. Under these conditions, we found that the 123-model prediction is consistent with the measured $m_W^{\mathrm{CDF}}$ at a $95\%$ Confidence Level (CL).

   hep-phPLB(2023)·2 citations
6. 06*

   B-hadron production at the LHC from bottom-quark pair production at NNLO+PS

   Javier Mazzitelli🇨🇭 · Alessandro Ratti🇩🇪 · Marius Wiesemann🇩🇪 · Giulia Zanderighi🇩🇪

   The production of B hadrons is among the most abundant fundamental QCD processes measured at the LHC. We present for the first time predictions for this process accurate to next-to-next-to-leading order in QCD perturbation theory by simulating bottom-quark pair production at this accuracy matched to parton showers. Our novel results are in good agreement with experimental data for the production of different types of B hadrons from ATLAS, CMS and LHCb at 7 TeV and/or 13 TeV, including various fiducial cross sections as well as single- and double-differential distributions, and 13 TeV/7 TeV cross-section ratios.

   hep-phhep-exPLB(2023)·31 citations
7. 07*

   On the Time Momentum Representation of Hadronic Vacuum Polarization and ${\mathbf{g}}_{\mathbf{\mu }}-2$

   David Greynat🇫🇷 · Eduardo de Rafael🇫🇷

   We propose a new set of model independent approximants adapted to the time momentum representation (TMR) of hadronic vacuum polarization (HVP) and its contribution to $g_{\mu }-2$. They provide a way to extrapolate lattice QCD (LQCD) results obtained in an optimal time-region, to the full range required for an evaluation of the HVP contribution to $g_{\mu }-2$. They offer as well a new way to confront LQCD results in restricted TMR regions, with the full contribution obtained from data driven determinations.

   hep-phhep-latJHEP(2023)·1 citation
8. 08*

   Hunting for the hidden-charm molecular states with strange quark in $B$ and $B_s$ decays

   Qi Wu🇨🇳 · Yan-Ke Chen🇨🇳 · Gang Li🇨🇳 · Shi-Dong Liu🇨🇳 · Dian-Yong Chen🇨🇳

   In the present work, we investigate the productions of the molecular states composed of $D_s^{(\ast )}{\bar{D}}^{(\ast )}$ and $D_s^{(\ast )}{\bar{D}}_s^{(\ast )}$ in the $B$ and $B_s$ decays by using an effective Lagrangian approach. The branching ratios in terms of the model parameter $\alpha$ and the binding energy $\Delta E$ are estimated. Our estimations indicate that the branching fractions are of the order of $10^{-4}$ and the relative ratios are very weakly dependent on the model parameter $\alpha$ and the binding energy $\Delta E$. The predicted ratios are helpful for searching the hidden-charm molecular states with strange quark in the future experiments at Belle II and LHCb.

   hep-phPRD(2023)·14 citations
9. 09*

   Analysis of the $T_{c\bar{s}}(2900)$ and related tetraquark states with the QCD sum rules

   Xiao-Song Yang🇨🇳 · Qi Xin🇨🇳 · Zhi-Gang Wang🇨🇳

   In this research, we tentatively assign the $T_{c\bar{s}}(2900)$ as the $A\bar{A}$-type tetraquark state, and study the mass spectrum of the tetraquark states with strange and doubly strange, which have the spin-parity $J^P=0^{+}$, $1^{+}$ and $2^{+}$, in the framework of the QCD sum rules in details, where the $A$ denotes the axialvector diquark state. The predicted mass $M=2.92\pm 0.12\mathrm{GeV}$ is in consistent with the experimental values $M=2.892\pm 0.014\pm 0.015\mathrm{GeV}$ and $2.921\pm 0.017\pm 0.020\mathrm{GeV}$ from the LHCb collaboration and supports assigning the $T_{c\bar{s}}(2900)$ to be the $A\bar{A}$-type scalar $c\bar{s}q\bar{q}$ tetraquark state. The predictions for other tetraquark states can be confronted to the experimental data in the future to diagnose the nature of the fully open flavor exotic states.

   hep-phInt.J.Mod.Phys.A(2023)·29 citations
10. 10*

    Dispersive constraints on fermion masses

    Hsiang-nan Li🇹🇼

    We demonstrate that fermion masses in the Standard Model (SM) can be constrained by the dispersion relations obeyed by hadronic and semileptonic decay widths of a fictitious heavy quark $Q$ with an arbitrary mass. These relations, imposing stringent connections between the high-mass and low-mass behaviors of decay widths, correlate a heavy quark mass and the chiral symmetry breaking scale. Given the known input from leading-order heavy quark expansion and a hadronic threshold for decay products, we solve for a physical heavy quark decay width. It is shown that the charm (bottom) quark mass $m_c=1.35$ GeV ($m_b=4.0$ GeV) can be determined by the dispersion relation for the $Q\to du\bar{d}$ ($Q\to c\bar{u}d$) decay with the threshold $2m_{\pi }$ ($m_{\pi }+m_D$), where $m_{\pi }$ ($m_D$) denotes the pion ($D$ meson) mass. Requiring that the dispersion relation for the $Q\to su\bar{d}$ ($Q\to d{\mu }^{+}{\nu }_{\mu }$, $Q\to u{\tau }^{-}{\bar{\nu }}_{\tau }$) decay with the threshold $m_{\pi }+m_K$ ($m_{\pi }+m_{\mu }$, $m_{\pi }+m_{\tau }$) yields the same heavy quark mass, $m_K$ being the kaon mass, we constrain the strange quark (muon, $\tau$ lepton) mass to be $m_s=0.12$ GeV ($m_{\mu }=0.11$ GeV, $m_{\tau }=2.0$ GeV). Moreover, all the predicted decay widths corresponding to the above masses agree with the data. It is pointed out that our formalism is similar to QCD sum rules for probing resonance properties, and that the Pauli interference (weak annihilation) provides the higher-power effect necessary for establishing the solutions of the hadronic (semilaptonic) decay widths. This work suggests that the parameters in the SM may not be free, but arranged properly to achieve internal dynamical consistency.

    hep-phPRD(2023)·13 citations
11. 11*

    Hyperfine splittings of heavy quarkonium hybrids

    Joan Soto🇪🇸 · Sandra Tomàs Valls🇪🇸

    In the framework of the Born-Oppenheimer Effective Field Theory, the hyperfine structure of heavy quarkonium hybrids at leading order in the 1/m Q expansion is determined by two potentials. We estimate those potentials by interpolating between the known short distance behavior and the long distance behavior calculated in the QCD Effective String Theory. The long distance behavior depends, at leading order, on two parameters which can be obtained from the long distance behavior of the heavy quarkonium potentials (up to sign ambiguities). The short distance behavior depends, at leading order, on two extra paramentes, which are obtained from a lattice calculation of the lower lying charmonium hybrid multiplets. This allows us to predict the hyperfine splitting both of bottomonium hybrids and of higher multiplets of charmonium hybrids. We carry out a careful error analysis and compare with other approaches.

    hep-phhep-latPRD(2023)·32 citations
12. 12*

    Gauged $L_e-L_{\mu }-L_{\tau }$ symmetry, fourth generation, neutrino mass and dark matter

    Satyabrata Mahapatra (1)🇮🇳 · Rabindra N. Mohapatra (2)🇺🇸 · Narendra Sahu (1) ((1) Indian Institute of Technology Hyderabad, (2) University of Maryland)🇮🇳

    We present two models where the familiar leptonic symmetry $L_e-L_{\mu }-L_{\tau }$ is a gauge symmetry. We show how anomaly cancellation constrains the allowed theories, with one of them requiring a fourth sequential chiral standard model fermion generation and a second one with three generations, requiring gauging of $(L_e-L_{\mu }-L_{\tau })-(B_1-B_2-B_3)$ with $B_a$ representing the baryon number of the $a$th generation quarks. Unlike global $L_e-L_{\mu }-L_{\tau }$ models which always leads to inverted mass hierarchy for neutrinos, the gauged version can lead to normal hierarchy. We show how to construct realistic models in both the cases and discuss the dark matter candidate in both. In our model, the breaking of $U(1{)}_{L_e-L_{\mu }-L_{\tau }}$ is responsible for neutrino mass via type-I mechanism whereas the real part of $U(1{)}_{L_e-L_{\mu }-L_{\tau }}$ breaking scalar field (called $\varphi$ here) plays the role of freeze-in dark matter candidate. Since $\varphi$ is unstable, for it to qualify as dark matter, its lifetime must be larger than the age of the Universe, implying that the relic of $\varphi$ is generated through freeze-in mechanism and its mass must be less than an MeV. We also discuss the possibility of explaining both muon and electron $(g-2)$ while being consistent with the dark matter relic density and lifetime constraints.

    hep-phastro-ph.COPLB(2023)·4 citations
13. 13*

    Rescattering effects in nucleon-to-meson form factors and application to tau-lepton-induced proton decay

    Andreas Crivellin🇨🇭 · Martin Hoferichter🇨🇭

    Nucleon decays put extremely stringent bounds on baryon-number-violating interactions. However, in case the corresponding operators involve only $\tau$ leptons, the direct two-body decays, e.g., $p\to {\pi }^0{\tau }^{+}$, are kinematically not allowed and nucleon decay can only proceed via an off-shell $\tau$, leading to $p\to {\pi }^0{\ell }^{+}{\nu }_{\ell }{\bar{\nu }}_{\tau }$. To calculate such processes, the momentum dependence of the form factors for nucleon-to-meson transitions, which describe the hadronization of the underlying process at the quark level, is needed. In this work, we point out new isospin and Fierz relations among such proton-kaon matrix elements and calculate the momentum dependence of the nucleon-to-meson form factors from the universal final-state interactions in terms of pion-nucleon or kaon-nucleon scattering phase shifts. We use these results to derive novel limits on the Wilson coefficients of the baryon-number-violating dimension-$6$ operators involving a $\tau$ lepton, which were previously unconstrained.

    hep-phhep-exhep-latnucl-thPLB(2023)·14 citations
14. 14*

    Baryon-photon interactions in Resummed Kinetic Field Theory

    Ivan Kostyuk🇩🇪 · Robert Lilow🇮🇱 · Matthias Bartelmann🇩🇪

    We explore how interactions between baryons and photons can be incorporated into Kinetic Field Theory (KFT), a description of cosmic structure formation based on classical Hamiltonian particle dynamics. In KFT, baryons are described as effective mesoscopic particles which represent fluid elements governed by the hydrodynamic equations. In this paper, we modify the mesoscopic particle model to include pressure effects exerted on baryonic matter through interactions with photons. As a proof of concept, we use this extended mesoscopic model to describe the tightly coupled baryon-photon fluid between matter-radiation equality and recombination. We show that this model can qualitatively reproduce the formation of baryon-acoustic oscillations in the cosmological power spectrum.

    ↳ astro-ph.COhep-phJCAP(2023)·1 citation
15. 15*

    New determination of the production cross section for $\gamma$ rays in the Galaxy

    Luca Orusa🇮🇹 · Mattia Di Mauro🇮🇹 · Fiorenza Donato🇮🇹 · Michael Korsmeier🇸🇪

    The flux of $\gamma$ rays is measured with unprecedented accuracy by the $\text{Fermi}$ Large Area Telescope from 100 MeV to almost 1 TeV. In the future, the Cherenkov Telescope Array will have the capability to measure photons up to 100 TeV. To accurately interpret this data, precise predictions of the production processes, specifically the cross section for the production of photons from the interaction of cosmic-ray protons and helium with atoms of the ISM, are necessary. In this study, we determine new analytical functions describing the Lorentz-invariant cross section for $\gamma$-ray production in hadronic collisions. We utilize the limited total cross section data for ${\pi }^0$ production channels and supplement this information by drawing on our previous analyses of charged pion production to infer missing details. In this context, we highlight the need for new data on ${\pi }^0$ production. Our predictions include the cross sections for all production channels that contribute down to the 0.5% level of the final cross section, namely $\eta$, $K^{+}$, $K^{-}$, $K_S^0$, and $K_L^0$ mesons as well as $\Lambda$, $\Sigma$, and $\Xi$ baryons. We determine the total differential cross section $d\sigma (p+p\to \gamma +X)/d{E}_{\gamma }$ from 10 MeV to 100 TeV with an uncertainty of 10% below 10 GeV of $\gamma$-ray energies, increasing to 20% at the TeV energies. We provide numerical tables and a script for the community to access our energy-differential cross sections, which are provided for incident proton (nuclei) energies from 0.1 to $10^7$ GeV (GeV/n).

    ↳ astro-ph.HEhep-phPRD(2023)·18 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.