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Nuclear Theory·nucl-th

Monday·May 8, 2023

8 papers—3 primary·5 cross-listed

All8Primary3Cross-lists5
  1. 04

    [Submitted on 3 May 2023] (cross-list from astro-ph.HE)

    The maximum mass and deformation of rotating strange quark stars with strong magnetic fields

    Fatemeh Kayanikhoo🇵🇱 · Mateusz Kapusta🇵🇱 · Miljenko Čemeljić🇨🇿

    We study the structure and total energy of a strange quark star (SQS) endowed with a strong magnetic field with different rotational frequencies. The MIT bag model is used, with the density-dependent bag constant for the equation of state (EOS). The EOS is computed considering the Landau quantization effect regarding the strong magnetic fields (up to G) in the interior of the strange quark star. Using the LORENE library, we calculate the structural parameters of SQS for different setups of magnetic field strengths and rotational frequencies. In each setup, we perform calculations for stellar configurations, with specified central enthalpy values. We investigate the configurations with the maximum gravitational mass of SQS in each setup. Our models of SQSs are compared in the maximum gravitational mass, binding energy, compactness, and deformation of the star. We show that the gravitational mass might exceed in some models, which is comparable with the mass of the recently detected ``black widow'' pulsar \emph{PSR J0952-0607} and the mass of \emph{GW190814} detected by the LIGO/Virgo collaboration. The deformation and maximum gravitational mass of SQS can be characterized by simple functions that have been fitted to account for variations in both magnetic field strength and frequency. Rapidly rotating strange stars have a minimum gravitational mass given by the equatorial mass-shedding limit.

    Comments:
    18 pages, 10 Figures, 2 tables, submitted to PhysRevD
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    2305.03055 [pdf]
    1 citation
  2. 05

    [Submitted on 4 May 2023] (cross-list from hep-ph)

    Probing the onset of maximal entanglement inside the proton in diffractive DIS

    Martin Hentschinski🇲🇽 · Dmitri E. Kharzeev🇺🇸 · Krzysztof Kutak🇵🇱 · Zhoudunming Tu🇺🇸

    It has been proposed that at small Bjorken , or equivalently at high energy, hadrons represent maximally entangled states of quarks and gluons. This conjecture is in accord with experimental data from the electron-proton collider HERA at the smallest accessible . In this Letter, we propose to study the onset of the maximal entanglement inside the proton using Diffractive Deep Inelastic Scattering. It is shown that the data collected by the H1 Collaboration at HERA allows to probe the transition to the maximal entanglement regime. By relating the entanglement entropy to the entropy of final state hadrons, we find a good agreement with the H1 data using both the exact entropy formula as well as its asymptotic expansion which indicates the presence of a nearly maximally-entangled state. Finally, future opportunities at the Electron Ion Collider are discussed.

    Comments:
    final version published in Phys.Rev.Lett. 131 (2023) 24, 241901
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    2305.03069 [pdf]
    PRL(2023)·52 citations
  3. 06

    [Submitted on 4 May 2023] (cross-list from hep-ph)

    Minimal model for the -boson mass, , and quark-mixing-matrix unitarity

    Andreas Crivellin🇨🇭 · Matthew Kirk🇪🇸 · Anil Thapa🇺🇸

    The triplet scalar with hypercharge predicts a positive definite shift in the mass, w.r.t.~the Standard Model prediction, if it acquires a vacuum expectation value. As this new field cannot couple directly to SM fermions (on its own), it has no significant impact on other low-energy precision observables and is weakly constrained by collider searches. In fact, the multi-lepton anomalies at the LHC even point towards new scalars that decay dominantly to bosons, as the neutral component of the triplet naturally does. In this article, we show that with a minimal extension of the scalar triplet model by a heavy vector-like lepton, being either I) an doublet with or II) an triplet with , couplings of the triplet to Standard Model leptons are possible. This minimal extension can then provide, in addition to the desired positive shift in the mass, a chirally enhanced contribution to . In addition version I) and II) can improve on and alleviate the tension in first-row CKM unitarity (known as the Cabibbo angle anomaly), respectively. Finally, both options, in general, predict sizable changes of , i.e.,~much larger than most other explanations where only effects are expected, making this channel a smoking gun signature of our model.

    Comments:
    5 pages + references, matches the published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2305.03081 [pdf]
    PRD(2023)·17 citations
  4. 07

    [Submitted on 5 May 2023] (cross-list from astro-ph.HE)

    Elasticity of neutron star mantle: improved compressible liquid drop model for cylindrical phases

    Nikita A. Zemlyakov · Andrey I. Chugunov (Ioffe Institute)

    Neutron stars are the densest objects in the Universe. They have microscopically homogeneous core and heterogeneous crust. In particular, there may be a specific layer inside neutron stars, the mantle, which consists of substantially non-spherical nuclei immersed in a background of relativistic degenerate electrons and quasi-free neutrons. In this paper we reconsider transverse shear modulus for cylindrical phases of the mantle within the framework of compressible liquid drop model. We demonstrate that transverse shear affects the shape of nuclear clusters: their cross-section becomes elliptical. This effect reduces respective elastic constant. Using a simple model we perform all derivations analytically and obtain the expression for the transverse shear modulus, which can be useful for astrophysical applications.

    Comments:
    12 pages, 4 figures, published in Universe
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Theory (nucl-th)
    arXiv:
    2305.03603 [pdf]
    Universe(2023)·4 citations
  5. 08

    [Submitted on 5 May 2023] (cross-list from hep-ph)

    Multi-charmed and singled charmed hadrons from coalescence: yields and ratios in different collision systems at LHC

    Vincenzo Minissale (1 and 2)🇮🇹 · Salvatore Plumari (1 and 2)🇮🇹 · Yifeng Sun (3)🇨🇳 · Vincenzo Greco (1 and 2) ((1) Department of Physics and Astronomy "E.Majorana", University of Catania, Catania, Italy, (2) Laboratori Nazionali del Sud, INFN-LNS, Catania, Italy, (3) School of Physics and Astronomy, Shanghai Key Laboratory for Particle Physics and Cosmology, and Key Laboratory for Particle Astrophysics and Cosmology (MOE), Shanghai Jiao Tong University, Shanghai, China)🇮🇹

    We study the production of charmed and multi-charmed hadrons in ultra-relativistic Heavy Ion Collisions coupling the transport approach for charm dynamics in the medium to an hybrid hadronization model of coalescence plus fragmentation. In this paper, we mainly discuss the particle yields for single charmed and multi-charmed baryons focusing mainly on the production of and . We provide first predictions for PbPb collision in 0-10% centrality class and then we explore the system size dependence through KrKr, to ArAr and OO collisions, planned within the ALICE3 experiment. In these cases, a monotonic behavior for the yields emerges which can be tested in future experimental data. We found about three order of magnitude increase in the production of in PbPb collisions compared with the yield in small collision systems like OO collisions. Furthermore, we investigate the effects on the particle production and spectra coming from the modification of the charm quark distribution due to the different size of the collision systems comparing also to the case of thermalized charm distributions. These results suggest that observation on the spectra and their evolution across system size can give information about the partial thermalization of the charm quark distribution as well as to its wave function width.

    Comments:
    12 pages, 8 figures; minor changes and adding of a figure
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2305.03687 [pdf]
    EPJC(2024)·29 citations

Affiliations

first authorsco-authorsvia INSPIRE