Fri·Feb 19, 2021Friday·February 19, 2021

1. 01*

   Dark matter candidates in the NMSSM with RH neutrino superfields

   Daniel E. Lopez-Fogliani🇦🇷 · Andres D. Perez🇦🇷 · Roberto Ruiz de Austri🇪🇸

   R-parity conserving supersymmetric models with right-handed (RH) neutrinos are very appealing since they could naturally explain neutrino physics and also provide a good dark matter (DM) candidate such as the lightest supersymmetric particle (LSP). In this work we consider the next-to-minimal supersymmetric standard model (NMSSM) plus RH neutrino superfields, with effective Majorana masses dynamically generated at the electroweak scale (EW). We perform a scan of the relevant parameter space and study both possible DM candidates: RH sneutrino and neutralino. Especially for the case of RH sneutrino DM we analyse the intimate relation between both candidates to obtain the correct amount of relic density. Besides the well-known resonances, annihilations through scalar quartic couplings and coannihilation mechanisms with all kind of neutralinos, are crucial. Finally, we present the impact of current and future direct and indirect detection experiments on both DM candidates.

   hep-phJCAP(2021)·13 citations
2. 02*

   Production and polarization of direct $J/\psi$ to $\mathcal{O}({\alpha }_s^3)$ in the improved color evaporation model in collinear factorization

   Vincent Cheung🇺🇸 · Ramona Vogt🇺🇸

   We calculate the production and polarization of direct $J/\psi$ in the improved color evaporation model at $\mathcal{O}({\alpha }_s^3)$ in the collinear factorization approach. We present the first calculation of polarization parameters ${\lambda }_{\vartheta }$, ${\lambda }_{\varphi }$, and ${\lambda }_{\vartheta \varphi }$ in the helicity and the Collins-Soper frames, as well as the frame-invariant polarization parameter $\tilde{\lambda }$ as a function of transverse momentum. We find agreement with both $J/\psi$ cross sections and the invariant polarization parameters at small and moderate $p_T$.

   hep-phPRD(2021)·27 citations
3. 03*

   Magnetic dipole moment of the $Z_{cs}(3985)$ state: diquark-antidiquark and molecular pictures

   U. Özdem🇹🇷 · K. Azizi🇮🇷

   We calculate the magnetic dipole moment of the newly observed charged hidden-charmed open strange $Z_{cs}(3985{)}^{-}$ state, recently observed by BESIII Collaboration. Based on the information provided by the experiment and theoretical studies followed the observation, we assign the quantum numbers $J^P=1^{+}$ and the quark composition $c\bar{c}s\bar{u}$ to this state and estimate the magnetic dipole moment of this resonance in both the compact diquark-antidiquark and molecular pictures. We apply the light cone QCD formalism and use the distribution amplitudes of the on-shell photon with different twists. The obtained results in both pictures are consistent with each other within the errors. The magnitude of the magnetic dipole moment shows that it is accessible in the experiment.

   hep-phhep-exhep-latEur.Phys.J.Plus(2021)·38 citations
4. 04*

   Flavor Dependent $U(1)$ Symmetric Zee Model with a Vector-like Lepton

   Toshinori Matsui🇰🇷 · Takaaki Nomura🇨🇳 · Kei Yagyu🇯🇵

   We extend the Zee model by introducing a vector-like lepton doublet and a flavor dependent global $U(1)$ symmetry. Flavor changing neutral currents in the quark sector can be naturally forbidden at tree level due to the $U(1)$ symmetry, while sufficient amount of lepton flavor violation is provided to explain current neutrino oscillation data. In our model, additional sources of CP-violation appear in the lepton sector, but their contribution to electric dipole moments is much smaller than current experimental bounds due to the Yukawa structure constrained by the $U(1)$ symmetry. We find that there is a parameter region where the strongly first order electroweak phase transition can be realized, which is necessary for the successful scenario of the electroweak baryogenesis in addition to new CP-violating phases. In the benchmark points satisfying neutrino data, lepton flavor violation data and the strongly first order phase transition, we show that an additional CP-even Higgs boson $H$ mainly decays into a lighter CP-odd Higgs boson $A$, i.e., $H\to AZ$ or $H\to AA$ with a characteristic pattern of lepton flavor violating decays of $A$.

   hep-phNPB(2021)·5 citations
5. 05*

   SU(3) analysis of four-quark operators: $K\to \pi \pi$ and vacuum matrix elements

   Antonio Pich🇪🇸 · Antonio Rodríguez-Sánchez🇫🇷

   Hadronic matrix elements of local four-quark operators play a central role in non-leptonic kaon decays, while vacuum matrix elements involving the same kind of operators appear in inclusive dispersion relations, such as those relevant in $\tau$-decay analyses. Using an $SU(3{)}_L\otimes SU(3{)}_R$ decomposition of the operators, we derive generic relations between these matrix elements, extending well-known results that link observables in the two different sectors. Two relevant phenomenological applications are presented. First, we determine the electroweak-penguin contribution to the kaon CP-violating ratio ${\epsilon }^{\prime }/\epsilon$, using the measured hadronic spectral functions in $\tau$ decay. Second, we fit our $SU(3)$ dynamical parameters to the most recent lattice data on $K\to \pi \pi$ matrix elements. The comparison of this numerical fit with results from previous analytical approaches provides an interesting anatomy of the $\Delta I=\frac{1}{2}$ enhancement, confirming old suggestions about its underlying dynamical origin.

   hep-phhep-latJHEP(2021)·21 citations
6. 06*

   Type-III Seesaw: Phenomenological Implications of the Information Lost in Decoupling from High-Energy to Low-Energy

   Saiyad Ashanujjaman🇮🇳 · Kirtiman Ghosh🇮🇳

   The type-III seesaw seems to explain the very minuteness of neutrino masses readily and naturally. The high-energy see-saw theories usually involve a larger number of effective parametres than the physical and measurable parametres appearing in the low-energy neutrino phenomenology. Casas-Ibarra parametrisation facilitates to encode the information lost in integrating the heavy fermions out in an arbitrary complex orthogonal matrix. The CMS collaboration has already searched for triplet fermions in the type-III seesaw model with only one generation of triplet fermion flavour democratically decaying into SM leptons. We reinterpret this CMS search in the context of a realistic type-III seesaw model with two or three generations of triplet fermions, and endeavour to comprehend the implications of the foregoing matrix on the $95\%$ CL lower limit on the mass of the triplet fermions. We also discuss the phenomenological implication of the aforesaid matrix in view of charged lepton flavour violating observables and displaced decays of the triplet fermions at colliders.

   hep-phhep-exhep-thPLB(2021)·28 citations
7. 07*

   Directional Detectability of Dark Matter With Single Phonon Excitations: Target Comparison

   Ahmet Coskuner🇺🇸 · Tanner Trickle🇺🇸 · Zhengkang Zhang🇺🇸 · Kathryn M. Zurek🇺🇸

   Single phonon excitations are sensitive probes of light dark matter in the keV-GeV mass window. For anisotropic target materials, the signal depends on the direction of the incoming dark matter wind and exhibits a daily modulation. We discuss in detail the various sources of anisotropy, and carry out a comparative study of 26 crystal targets, focused on sub-MeV dark matter benchmarks. We compute the modulation reach for the most promising targets, corresponding to the cross section where the daily modulation can be observed for a given exposure, which allows us to combine the strength of DM-phonon couplings and the amplitude of daily modulation. We highlight Al${}_2$O${}_3$ (sapphire), CaWO${}_4$ and h-BN (hexagonal boron nitride) as the best polar materials for recovering a daily modulation signal, which feature $\mathcal{O}(1-100)\%$ variations of detection rates throughout the day, depending on the dark matter mass and interaction. The directional nature of single phonon excitations offers a useful handle to mitigate backgrounds, which is crucial for fully realizing the discovery potential of near future experiments.

   hep-phastro-ph.COcond-mat.mtrl-sciPRD(2022)·68 citations
8. 08*

   Strong First Order Phase Transition and $B$ Violation in the Compact 341 Model

   A. Boubakir🇩🇿 · H. Aissaoui🇩🇿 · N. Mebarki🇩🇿

   Baryogenesis in the context of the compact $SU{\left(3\right)}_C\otimes SU{\left(4\right)}_L\otimes U{\left(1\right)}_X$ model is investigated. Using the finite temperature effective potential approach together with unitarity, stability and no ghost masses constraints, the existence of a strong first order electroweak phase transition (EWPT) was shown and checked numerically during all steps of the spontaneous breakdown of the gauge symmetry of the model. Higgs masses regions fulfilling the EWPT criteria are also discussed. Moreover, and as a byproduct of our study, the B-violation via sphaleron was also emphasized.

   hep-phhep-thInt.J.Mod.Phys.A(2021)·0 citations
9. 09*

   Estimation of the Mass of Dark Matter Using the Observed Mass Profiles of Late-Type Galaxies

   Ahmad Borzou🇺🇸

   The system of stability equations for galactic halos is under-determined in most of the models of dark matter (DM). Conventionally, the issue is resolved by taking the temperature as a constant, and the chemical potential and the mass density as position-dependent variables. In this paper, to close the under-determined set of equations, we remove the mass density using observations and leave the temperature and the chemical potential as position-dependent variables. We analyze observations of the mass profiles of 175 late-type galaxies in the Spitzer Photometry \& Accurate Rotation Curves (SPARC) database as well as 26 late-type dwarfs in the Little Things database, to construct the temperature profile of their DM halos by assuming that (1) DM in the halos obeys either the Fermi-Dirac or the Maxwell-Boltzmann distribution, and (2) the halos are in the virial state. We derive the dispersion velocity of DM at the center of the halos and show that its correlation with the halo's total mass is consistent with the direct observations of visible matter. Taking the latter agreement as a validation of our analysis, we derive the mass to the temperature of DM at the edge of the halos and show that it is galaxy independent and is equal to $m/T_{R_{200}}\simeq 10^{10}$ in natural units. In the thermal models of DM, such universal temperature is inherently assumed. In this paper, we derive the universal temperature from observations without imposing it by assumptions. Therefore, $T_{R_{200}}$ in the above ratio can be expressed in terms of the temperature of the cosmic microwave background (CMB) at the time of DM decoupling. This result is used to study possible cosmological scenarios. We show that observations are at odds with (1) non-thermal DM, (2) hot DM, and (3) collision-less cold DM. If DM is warm, we estimate its mass to be in the range of keV--MeV.

   ↳ astro-ph.COhep-phJCAP(2021)·3 citations
10. 10*

    A new take on the inflationary quintessence

    Zurab Kepuladze🇬🇪 · Michael Maziashvili🇬🇪

    The quintessence field coupled to the cosmic neutrino background (CNB) has been widely discussed as an alternative mechanism to address the coincidence problem. As it is well known, it is possible to extend such models to obtain quintessential inflation, that is, to incorporate inflationary stage as well. Taking an alternative route, one can start from the well established inflationary models and obtain successful quintessence models at the expense of coupling with the CNB. To Follow this route, we use a slightly reformulated model addressed in PRD95, 123521 (2017). This particular model assumes ${\mathcal{Z}}_2$ symmetry for both scalar field potential and coupling term, which then breaks down in course of the cosmological evolution. For our discussion, however, the ${\mathcal{Z}}_2$ symmetry of the potential is not mandatory the model to work. The conventional mechanism of particle production by the oscillating inflaton field (and their subsequent thermalization) remains operative. It is plain to see that the proposed construction can be easily applied for many successful models of inflation to incorporate dark energy at the expense of coupling with the CNB. We address the issue of neutrino nuggets from the quantum field theory point of view. Namely, these nuggets are considered as bound states caused basically by the Yukawa force, which arises in the framework of linear perturbation theory due to exchange of virtual quanta of quintessence field between the neutrinos.

    ↳ astro-ph.COhep-phPRD(2021)·11 citations
11. 11*

    Electron-Ion Collider in China

    Daniele P. Anderle🇨🇳 · Valerio Bertone🇫🇷 · Xu Cao🇨🇳 · Lei Chang · Ningbo Chang · Gu Chen · Xurong Chen · Zhuojun Chen · Zhufang Cui🇨🇳 · Lingyun Dai🇨🇳 · Weitian Deng🇨🇳 · Minghui Ding🇮🇹 and 90 other authors

    Lepton scattering is an established ideal tool for studying inner structure of small particles such as nucleons as well as nuclei. As a future high energy nuclear physics project, an Electron-ion collider in China (EicC) has been proposed. It will be constructed based on an upgraded heavy-ion accelerator, High Intensity heavy-ion Accelerator Facility (HIAF) which is currently under construction, together with a new electron ring. The proposed collider will provide highly polarized electrons (with a polarization of $\sim$80%) and protons (with a polarization of $\sim$70%) with variable center of mass energies from 15 to 20 GeV and the luminosity of (2-3) $\times$ 10${}^{33}$ cm${}^{-2}$ s${}^{-1}$. Polarized deuterons and Helium-3, as well as unpolarized ion beams from Carbon to Uranium, will be also available at the EicC. The main foci of the EicC will be precision measurements of the structure of the nucleon in the sea quark region, including 3D tomography of nucleon; the partonic structure of nuclei and the parton interaction with the nuclear environment; the exotic states, especially those with heavy flavor quark contents. In addition, issues fundamental to understanding the origin of mass could be addressed by measurements of heavy quarkonia near-threshold production at the EicC. In order to achieve the above-mentioned physics goals, a hermetical detector system will be constructed with cutting-edge technologies. This document is the result of collective contributions and valuable inputs from experts across the globe. The EicC physics program complements the ongoing scientific programs at the Jefferson Laboratory and the future EIC project in the United States. The success of this project will also advance both nuclear and particle physics as well as accelerator and detector technology in China.

    ↳ nucl-exhep-exhep-phnucl-thFront.Phys.(Beijing)(2021)·612 citations
12. 12*

    Can effective four-dimensional scalar theory be asymptotically free in a spacetime with extra dimensions?

    A.V. Kisselev🇷🇺 · V.A. Petrov🇷🇺

    We trace what happens with asymptotically free behavior of the running coupling in ${\varphi }^3$ theory in six-dimensional space-time if to compactify two spatial dimensions on a 2D closed manifold. The result can be considered as an effective 4D theory of infinitely many KK-type scalar fields with triple interactions. The effective \emph{dimensional} coupling inherits running to zero at high mass scales in a modified form depending on the size of the compact manifold. Some physical implications are discussed.

    ↳ hep-thhep-phmath-phmath.MPPRD(2021)·1 citation
13. 13*

    Constraints on interacting dark energy models from time-delay cosmography with seven lensed quasars

    Ling-Feng Wang🇨🇳 · Jie-Hao Zhang🇨🇳 · Dong-Ze He🇨🇳 · Jing-Fei Zhang🇨🇳 · Xin Zhang🇨🇳

    Measurements of time-delay cosmography of lensed quasars can provide an independent probe to explore the expansion history of the late-time Universe. In this paper, we employ the time-delay cosmography measurements from seven lenses (here abbreviated as the TD data) to constrain interacting dark energy (IDE) models. We mainly focus on the scenario of vacuum energy (with $w=-1$) interacting with cold dark matter, and consider four typical cases of the interaction form $Q$. When the TD data alone are employed, we find that the IDE models with $Q\propto {\rho }_{\mathrm{de}}$ seem to have an advantage in relieving the $H_0$ tension between the cosmic microwave background (CMB) and TD data. When the TD data are added to the CMB$+$BAO$+$SN$+H_0$ data, we find that: (i) the coupling parameter $\beta$ in all the considered IDE models is positive within 1$\sigma$ range, implying a mild preference for the case of cold dark matter decaying into dark energy; (ii) the IDE model with $Q=\beta H_0{\rho }_{\mathrm{c}}$ slightly relieves the $S_8$ tension, but the other considered IDE models further aggravate this tension; (iii) the Akaike information criteria of the IDE models with $Q\propto {\rho }_{\mathrm{c}}$ are lower than that of the $\Lambda$CDM model, indicating that these IDE models are more preferred by the current mainstream data. We conclude that the considered IDE models have their own different advantages when the TD data are employed, and none of them can achieve good scores in all aspects.

    ↳ astro-ph.COgr-qchep-phMNRAS(2022)·71 citations
14. 14*

    Quintessential inflation and cosmological seesaw Mechanism: reheating and observational constraints

    Llibert Aresté Saló🇬🇧 · David Benisty🇮🇱 · Eduardo I. Guendelman🇮🇱 · Jaime d. Haro🇪🇸

    Recently a new kind of quintessential inflation coming from the Lorentzian distribution has been introduced in [1,2]. The model leads to a very simple potential, which basically depends on two parameters, belonging to the class of $\alpha$-attractors and depicting correctly the early and late time accelerations of our universe. The potential emphasizes a {\it cosmological seesaw mechanism} (CSSM) that produces a large inflationary vacuum energy in one side of the potential and a very small value of dark energy on the right hand side of the potential. {Here we show that the model agrees with the recent observations and with the reheating constraints. Therefore the model gives a reasonable scenario beyond the standard $\Lambda$CDM that includes the inflationary epoch.}

    ↳ astro-ph.COgr-qchep-phhep-thJCAP(2021)·27 citations
15. 15*

    Covariant tetraquark equations in quantum field theory

    A. N. Kvinikhidze🇬🇪 · B. Blankleider🇦🇺

    We derive general covariant coupled equations of QCD describing the tetraquark in terms of a mix of four-quark states $2q2\bar{q}$, and two-quark states $q\bar{q}$. The coupling of $2q2\bar{q}$ to $q\bar{q}$ states is achieved by a simple contraction of a four-quark $q\bar{q}$-irreducible Green function down to a two-quark $q\bar{q}$ Bethe-Salpeter kernel. The resulting tetraquark equations are expressed in an exact field theoretic form, and are in agreement with those obtained previously by consideration of disconnected interactions; however, despite being more general, they have been derived here in a much simpler and more transparent way.

    ↳ hep-thhep-phnucl-thPRD(2022)·8 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.