Wed·Dec 30, 2020Wednesday·December 30, 2020

1. 01*

   Cabibbo-favored ${\Lambda }_c^{+}\to \Lambda a_0(980{)}^{+}$ decay in the final state interaction

   Yao Yu🇨🇳 · Yu-Kuo Hsiao🇨🇳

   The anti-triplet charmed baryon decays with the light scalar mesons are rarely measured, whereas the recent observation of the Cabibbo-favored ${\Lambda }_c^{+}\to \Lambda \eta {\pi }^{+}$ decay hints a possible ${\Lambda }_c^{+}\to \Lambda a_0(980{)}^{+},a_0(980{)}^{+}\to \eta {\pi }^{+}$ process. We hence study the ${\Lambda }_c^{+}\to \Lambda a_0(980{)}^{+}$ decay. Particularly, it is found that the final state interaction can give a significant contribution, where ${\Sigma }^{+}(1385)$ and $\eta$ in ${\Lambda }_c^{+}\to {\Sigma }^{+}(1385)\eta$ by exchanging a charged pion are transformed as $\Lambda$ and $a_0(980{)}^{+}$, respectively. Accordingly, we predict $\mathcal{B}({\Lambda }_c^{+}\to \Lambda a_0(980{)}^{+})=(1.7_{-1.0}^{+2.8}\pm 0.3)\times 10^{-3}$, accessible to the BESIII, BELLEII and LHCb experiments.

   hep-phhep-exPLB(2021)·19 citations
2. 02*

   Electric dipole moments in the extended scotogenic models

   Motoko Fujiwara🇯🇵 · Junji Hisano🇯🇵 · Chihiro Kanai🇯🇵 · Takashi Toma🇯🇵

   Electric dipole moments (EDMs) of charged leptons arise from a new source of CP violation in the lepton sector. In this paper, we calculate the EDMs of the charged leptons in the minimal scotogenic model with two singlet fermions, and the models extended with one or two triplet fermions instead of the singlet fermions, taking into account the constraints of the neutrino oscillation data, the charged lepton flavor violation and perturbative unitarity bound for the Yukawa couplings. We show that the hybrid model with one singlet and one triplet fermions predicts an electron EDM larger than the other models in both normal and inverted neutrino mass hierarchy. We find some parameter space has already been ruled out by the current upper bound of the electron EDM and further parameter space can be explored by future experiments.

   hep-phhep-exJHEP(2021)·9 citations
3. 03*

   Spin-$\frac{3}{2}$ doubly charmed baryon contribution to the magnetic moments of the spin-$\frac{1}{2}$ doubly charmed baryons

   Hao-Song Li🇨🇳 · Wen-Li Yang🇨🇳

   We have systematically investigated the magnetic moments of spin-$\frac{1}{2}$ doubly charmed baryons in the framework of the heavy baryon chiral perturbation theory. In this paper, one loop corrections with intermediate spin-$\frac{1}{2}$ and spin-$\frac{3}{2}$ doubly charmed baryon states are considered. The numerical results are calculated to next-to-leading order: ${\mu }_{{\Xi }_{cc}^{++}}=0.35{\mu }_N$, ${\mu }_{{\Xi }_{cc}^{+}}=0.62{\mu }_N$, ${\mu }_{{\Omega }_{cc}^{+}}=0.41{\mu }_N$. Our results may be useful for future experiment and chiral extrapolation of the lattice QCD.

   hep-phhep-exhep-thPRD(2021)·13 citations
4. 04*

   A Nondiagonal Pair of Majorana Particles at $e^{+}{e}^{-}$ Colliders

   Seong Youl Choi🇰🇷 · Jae Hoon Jeong🇰🇷

   We perform a comprehensive and model-independent analysis for characterizing the spin and dynamical structure of the production of a non-diagonal pair of Majorana particles with different masses and arbitrary spins, $e^{-}{e}^{+}\to X_2{X}_1$, followed by a sequential two-body decay, $X_2\to Z{X}_1$, of the heavier particle $X_2$ into a $Z$ gauge boson and the lighter particle $X_1$ escaping undetected at high-energy $e^{+}{e}^{-}$ colliders. Standard leptonic $Z$-boson decays, $Z\to {\ell }^{-}{\ell }^{+}$ with $\ell =e$ or $\mu$, are employed for precisely diagnosing the $Z$ polarization influenced by the production and decay processes. Based on helicity formalism and Wick helicity rotation for describing the correlated production-decay amplitudes and distributions, we work out the implications on the amplitudes and distributions of discrete CP symmetry and the Majorana condition that two particles are their own anti-particles. For the sake of a concrete illustration, an example of this type in the minimal supersymmetric Standard Model is investigated in detail.

   hep-phhep-exPRD(2021)·3 citations
5. 05*

   New fit of time-like proton electromagnetic form factors from $e^{+}{e}^{-}$ colliders

   Egle Tomasi-Gustafsson🇫🇷 · Andrea Bianconi🇮🇹 · Simone Pacetti🇮🇹

   The data on the proton form factors in the time-like region from the BaBar, BESIII and CMD-3 Collaborations are examined to have coherent pieces of information on the proton structure. Oscillations in the annihilation cross section, previously observed, are determined with better precision. The moduli of the individual form factors, determined for the first time, their ratio and the angular asymmetry of the annihilation reaction $e^{+}{e}^{-}\to \bar{p}p$ are discussed. Fiits of the available data on the cross section, the effective form factor, and the form factor ratio, allow to propose a description of the electric and magnetic time-like form factors from the threshold up to the highest momenta.

   hep-phnucl-thPRC(2021)·35 citations
6. 06*

   Signature of the Maximally Symmetric 2HDM via $W^{\pm }/Z$-Quadruplet Productions at the LHC

   N. Darvishi🇬🇧 · M.R. Masouminia🇬🇧

   We consider the Maximally Symmetric Two-Higgs Doublet Model (MS-2HDM) in which the so-called Standard Model (SM) alignment can be achieved naturally by the virtue of an SO(5) symmetry imposed on the 2HDM. We investigate the signature of the MS-2HDM via $pp\to HX\to V{V}^{\ast }X$ and $pp\to HHX\to V{V}^{\ast }{V}^{\prime }{V}^{\prime \ast }X$ processes at the LHC for different values of $\tan \beta$. We perform our calculations with NLO QCD accuracy, using the \textsf{Herwig~7} multi-purpose event generator at $\sqrt{s}=13$~TeV center-of-mass energy. We show that the production of single SM-like Higgs bosons via $W^{\pm }/Z$-pairs is completely aligned with the SM. Interestingly, the presence of the heavy Higgs states significantly enhances the cross-section for the $W^{\pm }/Z$-quadruplet production channels in the low-$p_{\perp }$ regions. These vital analyses may aid the future discovery of this minimal and very predictive extension of the SM and can be generalised to other realisations of the 2HDM.

   hep-phPRD(2021)·11 citations
7. 07*

   Lightest Higgs boson decays $h\to MZ$ in the $\mu$ from $\nu$ supersymmetric standard model

   Chang-Xin Liu🇨🇳 · Hai-Bin Zhang🇨🇳 · Jin-Lei Yang🇨🇳 · Shu-Min Zhao🇨🇳 · Tai-Fu Feng🇨🇳

   We study the lightest Higgs boson decays $h\to MZ$ in the $\mu$ from $\nu$ supersymmetric standard model ($\mu \nu$SSM), where $M$ is a vector meson $(\rho ,\omega ,\varphi ,J/\Psi ,{\rm Y})$. Compared to the minimal supersymmetric standard model (MSSM), the $\mu \nu$SSM introduces three right-handed neutrino superfields, which lead to the mixing of the Higgs doublets with the right-handed sneutrinos. The mixing affects the lightest Higgs boson mass and the Higgs couplings. In suitable parameter space, the $\mu \nu$SSM can give large new physics (NP) contributions to the signal strengths of $h\to MZ$ and $h\to \gamma \gamma$, which may be detected by a 100 TeV collider or the other future high energy colliders.

   hep-phJHEP(2023)·4 citations
8. 08*

   Anomalies in B mesons decays: A phenomenological approach

   Jorge Alda🇪🇸 · Jaume Guasch🇪🇸 · Siannah Penaranda🇪🇸

   The experimental measurements on flavour physics, in tension with Standard Model predictions, exhibit large sources of Lepton Flavour Universality violation. We perform an analysis of the effects of the global fits on the Wilson coefficients assuming a model independent effective Hamiltonian approach, by including a set of different scenarios in which the New Physics contributions to the Wilson coefficients are present in one, two or three of the Wilson coefficients at a time. We compare the results of the global fit with respect to two cases: the Standard Model and the more general case in which New Physics modifies three independent Wilson coefficients. The last mentioned scenario is the favoured one for explaining the tension between Standard Model predictions and B-physics anomalies, but a specific more restricted scenario can provide similar goodness with a smaller set of free parameters. A discussion of the implications of our analysis in leptoquark models is included.

   hep-phEur.Phys.J.Plus(2022)·20 citations
9. 09*

   IDM benchmarks for the LHC and future colliders

   Jan Kalinowski🇵🇱 · Tania Robens🇭🇷 · Dorota Sokolowska🇵🇱 · Aleksander Filip Zarnecki🇵🇱

   We present cross-section expectations for various processes and collider options, for benchmark scenarios of the Inert Doublet Model, a Two Higgs Doublet Model with a dark matter candidate. The proposed scenarios are consistent with current dark matter constraints, including the most recent bounds from the XENON1T experiment and relic density, as well as with known collider and low-energy limits. These benchmarks, chosen in earlier work for studies at $e^{+}{e}^{-}$ colliders, exhibit a variety of kinematic features that should be explored at current and future runs of the LHC. We provide cross sections for all relevant production processes at 13 TeV, 27 TeV and 100 TeV proton collider, as well as for a possible 10 TeV and 30 TeV muon collider.

   hep-phSymmetry·57 citations
10. 10*

    Implications of Rare Kaon Decays on Lepton Number Violating Interactions

    Frank F. Deppisch🇬🇧 · Kåre Fridell🇩🇪 · Julia Harz🇩🇪

    We explore the possibility of lepton number violation (LNV) manifesting in the rare kaon decay $K\to \pi \nu \nu$, and its consequences for radiative neutrino mass generation and the washout of Lepton asymmetry in high-scale leptogenesis scenarios. We perform the analysis in a model-independent framework, the Standard Model effective field theory (SMEFT), and discuss the possible LNV nature of the rare kaon decay in the context of the currently operating NA62 experiment at CERN. We find that, in case of a LNV interaction, its detection would put high-scale leptogenesis under tension and would hint to small radiatively generated neutrino masses.

    hep-phPoS(2021)·3 citations
11. 11*

    Pair structure of heavy tetraquark systems

    Guojun Huang🇨🇳 · Jiaxing Zhao🇨🇳 · Pengfei Zhuang🇨🇳

    We study the pair description of heavy tetraquark systems $|QQ\bar{Q}\bar{Q}⟩$ in the frame of a non-relativistic potential model. By taking the two heavy quark pairs $(Q\bar{Q})$ as colored clusters, the four-quark Schrödinger equation is reduced to a two-pair equation, when the inner motion inside the pairs can be neglected. Taking into account all the Casimir scaling potentials between two quarks and using the lattice QCD simulated mixing angle between the two color-singlet states for the tetraquark system, we extracted a detailed pair potential between the two heavy quark pairs.

    hep-phPRD(2021)·21 citations
12. 12*

    Electroweak $t\bar{t}$ hadroproduction in the presence of heavy $Z^{\prime }$ and $W^{\prime }$ bosons at NLO QCD in POWHEG

    Mohammad Mahdi Altakach🇫🇷 · Tomáš Ježo🇩🇪 · Michael Klasen🇩🇪 · Jean-Nicolas Lang🇨🇭 · Ingo Schienbein🇫🇷

    We extend and improve upon our previous calculation of electroweak top-quark pair hadroproduction in extensions of the Standard Model with extra heavy neutral and charged spin-1 resonances. In particular, we allow for flavour-non-diagonal $Z^{\prime }$ couplings and take into account non-resonant production in the SM and beyond including the contributions with $t$-channel $W$ and $W^{\prime }$ bosons. All amplitudes are generated using the Recola2 package. As in our previous work, we include NLO QCD corrections and consistently match to parton showers with the POWHEG method fully taking into account the interference effects between SM and new physics amplitudes. We consider the Sequential Standard Model, the Topcolour model, as well as the Third Family Hypercharge Model featuring non-flavour-diagonal $Z^{\prime }$ couplings which has been proposed recently to explain the anomalies in $B$ decays. We present numerical results for $t\bar{t}$ cross sections at hadron colliders with a centre-of-mass energy up to 100 TeV.

    hep-phhep-exPRD(2021)·9 citations
13. 13*

    Intrinsic quantum coherence in particle oscillations

    Anca Tureanu🇫🇮

    The quantum field theoretical description of coherence in the oscillations of particles, especially neutrinos, is a standing problem in particle physics. In this talk, several inconsistencies of the standard approach to particle oscillations will be explained, and how they are resolved in a process-independent manner, by a novel approach inspired by the Bardeen--Cooper--Schrieffer theory of superconductivity and the Nambu--Jona-Lasinio model. The formalism leads to corrections to the neutrino oscillation probability originally written by Pontecorvo and Gribov, however the standard probability is validated in the ultrarelativistic neutrino limit. The massive neutrino states are interpreted as quasiparticles on a vacuum condensate of "Cooper pairs" of massless flavour neutrinos. The newly defined oscillating particle states are for neutrino oscillations what the Klauder--Sudarshan--Glauber coherent states are for quantum optics.

    hep-phhep-thquant-phPoS(2021)·1 citation
14. 14*

    Impact of dark scalars on the radiative $H^{+}{W}^{-}Z$ vertex

    Nabarun Chakrabarty🇮🇳

    An $H^{+}{W}^{-}Z$ vertex, i.e, the interaction connecting a singly charged physical scalar to the $W^{\pm },Z$ gauge bosons is absent at the tree level in a scalar sector comprising only $SU(2{)}_L$ doublets. However, the interaction can be generated radiatively in such a case, an example of which is a two-Higgs doublet model. In this study, we extend a two-Higgs doublet scenario by additional $SU(2{)}_L$ scalar doublets. Upon endowing with appropriate discrete symmetries, these additional doublets so introduced can furnish successful candidates of dark matter. Interestingly, the same "dark" scalars can also radiatively enhance the strength of the $H^{+}{W}^{-}Z$ interaction. We compute the $H^{+}{W}^{-}Z$ vertex at one-loop in a non-linear gauge that eliminates certain unphysical interactions. While all possible constraints are taken into account in doing so, particular emphasis is given to the ones stemming from dark matter. Correlations between the dark matter observables and the $H^{+}{W}^{-}Z$ interaction-strength are studied. The study thus connects a radiatively generated $H^{+}{W}^{-}Z$ vertex to dark matter phenomenology.

    hep-ph0 citations
15. 15*

    Supernova neutrino detection through neutron emission by nuclei

    Pijushpani Bhattacharjee🇮🇳 · Kamales Kar🇮🇳

    Neutrinos from core collapse supernovae can excite nuclei of some detector materials beyond their neutron emission thresholds. Detection of these neutrons can give valuable information about the supernova explosion mechanism and possibly also throw light on neutrino properties. In this article, we give a brief review of the basic physics of neutrino induced neutron emission and describe the results of some recent calculations of supernova neutrino induced neutrons for some specific target detector materials due to charged current (CC) interactions of the electron flavored neutrinos and antineutrinos as well as due to neutral current (NC) interactions of neutrinos and antineutrinos of all flavors with the detector nuclei. We highlight the fact that a detector material such as lead with a relatively large neutron excess produces neutrons dominantly through the CC interaction of the ${\nu }_e$s, whereas a material such as iron with small neutron excess produces neutrons dominantly through the combined NC interaction of all the six neutrino and antineutrino species. This raises the interesting possibility of probing the fraction of mu- and tau flavored neutrinos (which interact only through NC interaction) in the supernova neutrino flux by means of simultaneous detection of a supernova in a lead and an iron detector, for example.

    hep-phastro-ph.HEEur.Phys.J.ST(2021)·2 citations
16. 16*

    One-loop Corrections to the Two-Body Decays of the Charged Higgs Bosons in the Real and Complex NMSSM

    Thi Nhung Dao🇻🇳 · Margarete Muhlleitner🇩🇪 · Shruti Patel🇩🇪 · Kodai Sakurai🇩🇪

    We evaluate the full next-to-leading order supersymmetric (SUSY) electroweak and SUSY-QCD corrections to the on-shell two-body decays of the charged Higgs bosons in the framework of the CP-conserving and CP-violating Next-to-Minimal Supersymmetric extension of the Standard Model (NMSSM). Our corrections are implemented in the code NMSSMCALCEW in order to compute the branching ratios of the charged Higgs boson where we also take into account the state-of-the-art QCD corrections already included in the code. We investigate the impact of the NLO corrections for each decay mode in a wide range of the parameter space that is allowed by the theoretical and experimental constraints. The new version of NMSSMCALCEW is made publicly available.

    hep-phEPJC(2021)·11 citations
17. 17*

    Kick-alignment: matter asymmetry sourced dark matter

    Rodrigo Alonso🇬🇧 · Jakub Scholtz🇬🇧

    We investigate the possibility that the dark matter abundance is sourced by the baryon/lepton asymmetry of the early Universe. It turns out that a Goldstone field of a local classically preserved symmetry in the Standard Model experiences a kick during a period of baryon/lepton number generation. This mechanism can be regarded as dynamical generation of initial conditions for misalignment yet the prediction for relic abundance presents an inverse dependence on the coupling in parallel with freeze-in vs freeze-out. We explore two realizations of this mechanism and show that in conjunction with leptogenesis, it is possible to identify a viable promising region of parameter space for dark matter production with mass 10 MeV - 1 GeV and decay constant f in the range of $10^{10}-10^{12}$ GeV.

    hep-phastro-ph.COPRD(2021)·4 citations
18. 18*

    Hypergeometric Functions and Feynman Diagrams

    Mikhail Kalmykov🇷🇺 · Vladimir Bytev🇷🇺 · Bernd Kniehl🇩🇪 · Sven-Olaf Moch🇩🇪 · Bennie Ward🇺🇸 · Scott Yost🇺🇸

    The relationship between Feynman diagrams and hypergeometric functions is discussed. Special attention is devoted to existing techniques for the construction of the $ϵ$-expansion. As an example, we present a detailed discussion of the construction of the epsilon-expansion of the Appell function $F_3$ around rational values of parameters via an iterative solution of differential equations. As a by-product, we have found that the one-loop massless pentagon diagram in dimension $d=3-2ϵ$ is not expressible in terms of multiple polylogarithms. Another interesting example is the Puiseux-type solution involving a differential operator generated by a hypergeometric function of three variables. The holonomic properties of the $F_N$ hypergeometric functions are briefly discussed.

    ↳ hep-thhep-phmath-phmath.AP+231 citations
19. 19*

    Cosmic-ray transport and gamma-ray emission in M31

    Audrey Do🇺🇸 · Matthew Duong🇺🇸 · Alex McDaniel🇺🇸 · Collin O'Connor🇺🇸 · Stefano Profumo🇺🇸 · Justine Rafael🇺🇸 · Connor Sweeney🇺🇸 · Washington Vera III🇺🇸

    We study the possibility that an extended cosmic-ray leptonic and/or hadronic halo is at the origin of the large-scale gamma-ray emission detected from the Andromeda Galaxy (M31). We consider a broad ensemble of non-homogeneous diffusion scenarios and of cosmic-ray injection sources. We find that cosmic-ray electrons and protons could be, and very likely are, responsible for part, or all, of the gamma-ray emission from M31, including out to more than 100 kpc from the center of the galaxy. We also simulate possible emission from pulsars in M31, and consider the effect of regions of highly inefficient diffusion around cosmic-ray acceleration sites, as suggested by recent TeV halo observations with Cherenkov telescopes.

    ↳ astro-ph.HEastro-ph.GAhep-phPRD(2021)·12 citations
20. 20*

    Oscillons during Dirac-Born-Infeld Preheating

    Yu Sang🇨🇳 · Qing-Guo Huang🇨🇳

    Oscillons are long-lived, localized, oscillating nonlinear excitations of a real scalar field which can be abundantly produced during preheating after inflation. We give the first $(3+1)$-dimensional simulation for the oscillon formation during preheating with noncanonical kinetic terms, e.g. the Dirac-Born-Infeld form, and find that the formation of oscillons is significantly influenced by the noncanonical effect.

    ↳ hep-thastro-ph.COgr-qchep-phPLB(2021)·21 citations
21. 21*

    Inflationary magnetogenesis in the perturbative regime

    Massimo Giovannini🇨🇭

    While during inflation a phase of increasing gauge coupling allows for a scale-invariant hyperelectric spectrum, when the coupling decreases a flat hypermagnetic spectrum can be generated for typical wavelengths larger than the effective horizon. After the gauge coupling flattens out the late-time hypermagnetic power spectra outside the horizon in the radiation epoch are determined by the hyperelectric fields at the end of inflation whereas the opposite is true in the case of decreasing coupling. Instead of imposing an abrupt freeze after inflation, we consider a smooth evolution of the mode functions by positing that the gauge couplings and their conformal time derivatives are always continuous together with the background extrinsic curvature. The amplified gauge power spectra are classified according to their transformation properties under the duality symmetry. After clarifying the role of the comoving and of the physical spectra in the formulation of the relevant magnetogenesis constraints, the parameter space of the scenario is scrutinized. It turns out that a slightly blue hyperelectric spectrum during inflation may lead to a quasi-flat hypermagnetic spectrum prior to matter radiation equality and before the relevant wavelengths reenter the effective horizon. In this framework the gauge coupling is always perturbative but the induced large-scale magnetic fields can be of the order of a few hundredths of a nG and over typical length scales between a fraction of the Mpc and $100$ Mpc prior to the gravitational collapse of the protogalaxy.

    ↳ gr-qcastro-ph.COhep-phhep-thClass.Quant.Grav.(2021)·13 citations
22. 22*

    Minimal SU(5) Asymptotic Grand Unification

    Giacomo Cacciapaglia🇫🇷 · Alan S. Cornell🇿🇦 · Corentin Cot🇫🇷 · Aldo Deandrea🇫🇷

    We present a minimal model of asymptotic grand unification based on an $SU(5)$ gauge theory in a compact $S^1/({\mathbb{Z}}_2\times {\mathbb{Z}}_2^{\prime })$ orbifold. The gauge couplings run to a unified fixed point in the UV, without supersymmetry. By construction, fermions are embedded in different $SU(5)$ bulk fields. As a consequence, baryon number is conserved, thus preventing proton decay, and the lightest Kaluza-Klein tier consists of new states that cannot decay into standard model ones. We show that the Yukawa couplings can be either in the bulk or localized, and run to an asymptotically free fixed point in the UV. The lightest massive state can play the role of Dark Matter, produced via baryogenesis, for a Kaluza-Klein mass of about $2.4$ TeV.

    ↳ hep-thhep-phPRD(2021)·16 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.