Mon·Nov 16, 2020Monday·November 16, 2020

1. 01*

   Neutrino emission and initial evolution of axionic quark nuggets

   O. Santillán🇦🇷 · A. Morano🇦🇷

   The axion quark nuggets introduced in \cite{zhitnitsky}-\cite{zhitnitsky13} are a candidate for cold dark matter which, in addition, may be relevant in baryogenesis scenarios. The present work studies their evolution till they enter in the colour superconducting phase. This evolution was already considered in \cite{zhitnitsky5}, where it is concluded that a large chemical potential $\mu$ is induced on the bulk of the object. The baryon number accumulated at the domain wall surrounding the object is taken as predominant in \cite{zhitnitsky5}, and it is suggested that internal and external fluxes are compensated and can be neglected. In the present work, the possibility that the bulk contribution to the baryon number may be relevant at initial stages and that the object may emit a large amount of neutrinos due to quark-antiquark annihilations is taken into account. The outcome is a more violent contraction of the object and, perhaps, a more effective cooling. Therefore, the resulting objects may have a smaller size. Even taking into account these corrections, it is concluded that the cosmological applications of these objects are not spoiled. These applications are discussed along the text.

   hep-phgr-qchep-thPRD(2021)·8 citations
2. 02*

   Radiative Baryonic Decay ${\mathcal{B}}^{\ast }\left(\frac{3}{2}\right)\to \mathcal{B}\left(\frac{1}{2}\right)+\gamma$ in Constituent Quark Model: A Tutorial

   Fayyazuddin🇵🇰 · M. Jamil Aslam🇵🇰

   The radiative baryonic decay ${\mathcal{B}}^{\ast }\left(\frac{3}{2}\right)\to \mathcal{B}\left(\frac{1}{2}\right)+\gamma$ is a magnetic dipole $(M1)$ transition. It requires the transition magnetic moment ${\mu }_{\mathcal{B}\left(3/2\right)\to \mathcal{B}\left(1/2\right)}$. The transition magnetic moments for the helicities $1/2$ and $3/2$ are evaluated in the frame work of constituent quark model in which the intrinsic spin and the magnetic moments of quarks $u,d$ and $s$ play a key role. Within this framework, the radiative decays ${\Delta }^{+}\to p+\gamma$, ${\Sigma }^{\ast 0}\to \Lambda +\gamma$, ${\Sigma }^{\ast +}\to {\Sigma }^{+}+\gamma$ and ${\Xi }^{\ast 0}\to {\Xi }^0+\gamma$ are analyzed in detail. The branching ratio for these decays is found to be in good agreement with the corresponding experimental values.

   hep-ph6 citations
3. 03*

   Main properties of new heavy hadrons and the luminosity of hadronic dark matter

   Vladimir Kuksa🇷🇺 · Vitaly Beylin🇷🇺

   The origin and main properties of new heavy hadrons as dark matter candidates, are represented. Low-energy interactions of new hadrons with leptons and nucleons are described in the terms of effective vertexes. We consider the lowest excited levels of new mesons in the frame-work of the Heavy Quark Effective Theory. The effect of fine and hyper-fine splitting of excited states follows directly from this theory. We analyze phenomenological consequences of this effect as manifestation of dark matter particles.

   hep-ph0 citations
4. 04*

   NNLO HTLpt predictions for the curvature of the QCD phase transition line

   Najmul Haque🇮🇳 · Michael Strickland🇺🇸

   We present predictions for the second- and fourth-order curvature coefficients of the QCD phase transition line using the NNLO HTLpt-resummed thermodynamic potential. We present three cases corresponding to (i) ${\mu }_s={\mu }_l={\mu }_B/3$, (ii) ${\mu }_s=0$, ${\mu }_l={\mu }_B/3,$ and (iii) $S=0$, $Q/B=0.4$, ${\mu }_l={\mu }_B/3$. In all three cases, we find excellent agreement with continuum extrapolated lattice QCD results for ${\kappa }_2$, given current statistical uncertainties. We also make HTLpt predictions for ${\kappa }_4$ in all three cases, finding again excellent agreement with lattice extractions of this coefficient where available.

   hep-phnucl-thPRC(2021)·25 citations
5. 05*

   Strangeness enhancement and flow-like effects in $e^{+}{e}^{-}$ annihilation at high parton density

   P. Castorina🇮🇹 · D. Lanteri🇮🇹 · H. Satz🇩🇪

   Strangeness enhancement and collective flow are considered signatures of the quark gluon plasma formation. These phenomena have been detected not only in relativistic heavy ion collisions but also in high energy, high multiplicity events of proton-proton and proton-nucleus ("small systems") scatterings. Indeed, a universal behavior emerges by considering the parton density in the transverse plane as the dynamical quantity to specify the initial condition of the collisions. On the other hand, $e^{+}{e}^{-}$ annihilation data at LEP and lower energies indicate that there is no strangeness enhancement and no flow-like effect. We show that the parton density in the transverse plane generated in $e^{+}{e}^{-}$ annihilation at the available energy is too low to expect such effects. The event-by-event multiplicity where strangeness suppression and flow-like phenomenon could show up in $e^{+}{e}^{-}$ is evaluated.

   hep-phEPJA(2021)·9 citations
6. 06*

   Axion-like Particles at Future Neutrino Experiments: Closing the "Cosmological Triangle"

   Vedran Brdar🇺🇸 · Bhaskar Dutta🇺🇸 · Wooyoung Jang🇺🇸 · Doojin Kim🇺🇸 · Ian M. Shoemaker🇺🇸 · Zahra Tabrizi🇺🇸 · Adrian Thompson🇺🇸 · Jaehoon Yu🇺🇸

   Axion-like particles (ALPs) provide a promising direction in the search for new physics, while a wide range of models incorporate ALPs. We point out that future neutrino experiments, such as DUNE, possess competitive sensitivity to ALP signals. The high-intensity proton beam impinging on a target can not only produce copious amounts of neutrinos, but also cascade photons that are created from charged particle showers stopping in the target. Therefore, ALPs interacting with photons can be produced (often energetically) with high intensity via the Primakoff effect and then leave their signatures at the near detector through the inverse Primakoff scattering or decays to a photon pair. Moreover, the high-capability near detectors allow for discrimination between ALP signals and potential backgrounds, improving the signal sensitivity further. We demonstrate that a DUNE-like detector can explore a wide range of parameter space in ALP-photon coupling $g_{a\gamma }$ vs ALP mass $m_a$, including some regions unconstrained by existing bounds; the "cosmological triangle" will be fully explored and the sensitivity limits would reach up to $m_a\sim 3-4$ GeV and down to $g_{a\gamma }\sim 10^{-8}{\mathrm{GeV}}^{-1}$.

   hep-phhep-exPRL(2021)·86 citations
7. 07*

   Phase transitions and critical behavior in hadronic transport with a relativistic density functional equation of state

   Agnieszka Sorensen🇺🇸 · Volker Koch🇺🇸

   We develop a flexible, relativistically covariant parameterization of dense nuclear matter equation of state suited for inclusion in computationally demanding hadronic transport simulations. Within an implementation in the hadronic transport code SMASH, we show that effects due to bulk thermodynamic behavior are reproduced in dynamic hadronic systems, demonstrating that hadronic transport can be used to study critical behavior in dense nuclear matter, both at and away from equilibrium. We also show that two-particle correlations calculated from hadronic transport simulation data follow theoretical expectations based on the second order cumulant ratio, and constitute a clear signature of crossing the phase diagram above the critical point.

   ↳ nucl-thhep-phPRC(2021)·55 citations
8. 08*

   Jet measurements at CMS

   Cristian Baldenegro (on behalf of the CMS Collaboration)🇺🇸

   Recent measurements based on jet production in high energy pp collisions at the CERN LHC with the CMS detector are reported. Specifically, the measurement of the inclusive jet production cross section as a function of the anti-$k_t$ distance parameter $R$ divided by the jet cross section at $R=0.4$, is discussed. The cross section ratio is sensitive to various perturbative and non-perturbative treatments of the jet formation process in quantum chromodynamics (QCD). In the second study, the regimes of validity of the parton shower and matrix element approaches are tested on multijet events in pp collisions at $\sqrt{s}=8$ and $13$ TeV. Special attention is given to the second and third leading $p_{\text{T}}$ jets and their momenta and rapidity-azimuth correlations. Finally, studies of dijet production where the two leading $p_T$ jets are separated by a large pseudorapidity interval void of charged particles is presented. This signature is expected from hard color singlet exchange (two-gluon exchange in perturbative QCD). The latter can be treated with perturbative QCD techniques based on the Balitsky-Fadin-Kuraev-Lipatov (BFKL) evolution equations.

   ↳ hep-exhep-phPoS(2021)·1 citation
9. 09*

   Hyperon electromagnetic form factors in the timelike region

   Johann Haidenbauer🇩🇪 · Ulf-G. Meißner🇩🇪 · Ling-Yun Dai🇨🇳

   Electromagnetic form factors of hyperons ($\Lambda$, $\Sigma$, $\Xi$) in the timelike region, accessible in the reaction $e^{+}{e}^{-}\to \bar{Y}Y$, are studied. The focus is on energies close to the reaction thresholds, where the properties of these form factors are significantly influenced by the interaction in the final $\bar{Y}Y$ system. This interaction is taken into account in the calculation, utilizing $\bar{Y}Y$ potential models that have been constructed by the Jülich group for the analysis of data from the reaction $\bar{p}p\to \bar{Y}Y$ in the past. The enhancement of the effective form factor for energies close to the threshold, seen in experiments of $e^{+}{e}^{-}\to \bar{\Lambda }\Lambda$ and $e^{+}{e}^{-}\to {\bar{\Sigma }}^0\Lambda$, is reproduced. With regard to the reactions $e^{+}{e}^{-}\to {\bar{\Sigma }}^{-}{\Sigma }^{+},{\bar{\Sigma }}^0{\Sigma }^0,{\bar{\Sigma }}^{+}{\Sigma }^{-}$ a delicate interplay between the three channels is observed in the results at low energies, caused by the $\bar{\Sigma }\Sigma$ interaction. Predictions for the electromagnetic form factors $G_M$ and $G_E$ in the timelike region are presented for the $\Lambda$, $\Sigma$, and $\Xi$ hyperons.

   ↳ nucl-thhep-exhep-phPRD(2021)·45 citations
10. 10*

    Dependence of the WIMP Angular Kinetic-Energy Distribution on the Solar Galactic Orbital Velocity

    Chung-Lin Shan🇹🇼

    In this article, we study in a little more detail the angular kinetic-energy distribution of halo Weakly Interacting Massive Particles (WIMPs) and consider two simple modifications with the Solar Galactic orbital velocity in our Monte Carlo simulations of the 3-dimensional WIMP velocity as the first trial of future investigations on distinguishing models of the Galactic structure of Dark Matter particles by using directional direct detection data.

    ↳ astro-ph.HEastro-ph.GAastro-ph.SRhep-ph0 citations
11. 11*

    Core-Collapse Supernove Burst Neutrinos in DUNE

    C. Cuesta (on behalf of the DUNE collaboration)🇪🇸

    The Deep Underground Neutrino Experiment (DUNE), a 40-kton fiducial mass underground liquid argon time projection chamber experiment, will be sensitive to the electron-neutrino-flavor component of the burst of neutrinos expected from the next Galactic core-collapse supernova. Such an observation will bring unique insight into the astrophysics of core collapse as well as into the properties of neutrinos. The recent progress on detection and reconstruction of supernova burst neutrinos in DUNE, including the contribution of the light detection systems are presented.

    ↳ physics.ins-detastro-ph.HEastro-ph.IMhep-ex+1PoS(2021)·3 citations
12. 12*

    Classification of Magnetic Vortices by Angular Momentum Conservation

    Kenji Fukushima🇯🇵 · Yoshimasa Hidaka🇯🇵 · Ho-Ung Yee🇺🇸

    Superfluid vortices are quantum excitations carrying quantized amount of orbital angular momentum in a phase where global symmetry is spontaneously broken. We address a question of whether magnetic vortices in superconductors with dynamical gauge fields can carry nonzero orbital angular momentum or not. We discuss the angular momentum conservation in several distinct classes of examples from crossdisciplinary fields of physics across condensed matter, dense nuclear systems, and cosmology. The angular momentum carried by gauge field configurations around the magnetic vortex plays a crucial role in satisfying the principle of the conservation law. Based on various ways how the angular momentum conservation is realized, we provide a general scheme of classifying magnetic vortices in different phases of matter.

    ↳ hep-thcond-mat.str-elcond-mat.supr-conhep-ph+1PRResearch(2021)·0 citations
13. 13*

    Modeling and searching for a stochastic gravitational-wave background from ultralight vector bosons

    Leo Tsukada🇯🇵 · Richard Brito🇮🇹 · William E. East🇨🇦 · Nils Siemonsen🇨🇦

    Ultralight bosons, which are predicted in a variety of beyond-Standard-Model scenarios as dark-matter candidates, can trigger the superradiant instability around spinning black holes. This instability gives rise to oscillating boson condensates which then dissipate through the emission of nearly monochromatic gravitational waves. Such systems are promising sources for current and future gravitational-wave detectors. In this work, we consider minimally-coupled, massive vector bosons, which can produce a significantly stronger gravitational-wave signal compared to the scalar case. We adopt recently obtained numerical results for the gravitational-wave flux, and astrophysical models of black hole populations that include both isolated black holes and binary merger remnants, to compute and study in detail the stochastic gravitational-wave background emitted by these sources. Using a Bayesian framework, we search for such a background signal emitted using data from the first and second observing runs of Advanced LIGO. We find no evidence for such a signal. Therefore, the results allow us to constrain minimally coupled vector fields with masses in the range $0.8\times 10^{-13}\mathrm{eV}\le m_b\le 6.0\times 10^{-13}\mathrm{eV}$ at 95% credibility, assuming optimistically that the dimensionless spin distribution for the isolated black hole population is uniform in the range $[0,1]$. With more pessimistic assumptions, a narrower range around $m_b\approx 10^{-13}\mathrm{eV}$ can still be excluded as long as the upper end of the uniform distribution for dimensionless black hole spin is $\gtrsim 0.2$.

    ↳ astro-ph.HEgr-qchep-phPRD(2021)·103 citations
14. 14*

    Holographic Anisotropic Model for Heavy Quarks in Anisotropic Hot Dense QGP with External Magnetic Field

    Irina Ya. Aref'eva🇷🇺 · Kristina Rannu🇷🇺 · Pavel Slepov🇷🇺

    We present a five-dimensional fully anisotropic holographic model for heavy quarks supported by Einstein-dilaton-three-Maxwell action; one of the Maxwell fields is related to an external magnetic field. Influence of the external magnetic field on the 5-dim black hole solution and the confinement/deconfinement phase diagram is considered. The effect of the inverse magnetic catalyses is revealed and positions of critical end points are found.

    ↳ hep-thhep-phJHEP(2021)·67 citations
15. 15*

    A light dilaton in a metastable vacuum

    Daniel Elander🇫🇷 · Maurizio Piai🇬🇧 · John Roughley🇬🇧

    We identify a parametrically light dilaton by studying the perturbations of metastable vacua along a branch of regular supergravity backgrounds that are dual to four-dimensional confining field theories. The branch includes also stable and unstable solutions. The former encompass, as a special case, the geometry proposed by Witten as a holographic model of confinement. The latter approach a supersymmetric solution, by enhancing a condensate in the dual field theory. A phase transition separates the space of stable backgrounds from the metastable ones. In proximity of the phase transition, one of the lightest scalar states inherits some of the properties of the dilaton, despite not being particularly light.

    ↳ hep-thhep-lathep-phPRD(2021)·22 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.