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Nuclear Theory·nucl-th

Thursday·June 13, 2019

8 papers—1 primary·7 cross-listed

All8Primary1Cross-lists7
  1. 02

    [Submitted on 11 Jun 2019] (cross-list from hep-ph)

    New Physics Probes: Atomic Parity Violation, Polarized Electron Scattering and Neutrino-Nucleus Coherent Scattering

    Giorgio Arcadi🇮🇹 · Manfred Lindner🇩🇪 · Jessica Martins🇧🇷 · Farinaldo S. Queiroz🇧🇷

    Atomic Parity Violation (APV) is usually quantified in terms of the weak nuclear charge of a nucleus, which depends on the coupling strength between the atomic electrons and quarks. In this work, we review the importance of APV to probing new physics using effective field theory. Furthermore, using invariance, we correlate our findings with those from neutrino-nucleus coherent scattering. Moreover, we investigate signs of parity violation in polarized electron scattering and show how precise measurements on the Weinberg angle, , will give rise to competitive bounds on light mediators over a wide range of masses and interactions strength. Lastly, apply our bounds to several models namely, Dark Z, Two Higgs Doublet Model- and 3-3-1, considering both light and heavy mediator regimes.

    Comments:
    9 pages, 3 figures, 2 tables
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1906.04755 [pdf]
    NPB(2020)·56 citations
  2. 03

    [Submitted on 12 Jun 2019] (cross-list from hep-ph)

    Possible Molecular States Composed of Doubly Charmed Baryons with Couple-channel Effect

    Bin Yang🇨🇳 · Lu Meng🇨🇳 · Shi-Lin Zhu🇨🇳

    We systematically investigate the possible molecular states composed of (1) two spin- doubly charmed baryons, and (2) a pair of spin- and spin- doubly charmed baryons. The one-boson-exchange (OBE) model is used to describe the potential between two baryons. The channel mixing effect is considered for the systems with the same quantum number but different total spin () and orbital angular momenta (). We also study the channel mixing effect among the systems composed of various doubly charmed baryons if they have the same quantum number. Many of the systems are good candidates of molecular states.

    Comments:
    19 pages, 5 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1906.04956 [pdf]
    EPJA(2020)·15 citations
  3. 04

    [Submitted on 12 Jun 2019] (cross-list from astro-ph.HE)

    Current Status of r-Process Nucleosynthesis

    T. Kajino🇯🇵 · W. Aoki🇯🇵 · A. B. Balantekin🇺🇸 · R. Diehl🇩🇪 · M. A. Famiano🇺🇸 · G. J. Mathews🇺🇸

    The rapid neutron capture process (r process) is believed to be responsible for about half of the production of the elements heavier than iron and contributes to abundances of some lighter nuclides as well. A universal pattern of r-process element abundances is observed in some metal-poor stars of the Galactic halo. This suggests that a well-regulated combination of astrophysical conditions and nuclear physics conspires to produce such a universal abundance pattern. The search for the astrophysical site for r-process nucleosynthesis has stimulated interdisciplinary research for more than six decades. There is currently much enthusiasm surrounding evidence for r-process nucleosynthesis in binary neutron star mergers in the multi-wavelength follow-up observations of kilonova/gravitational-wave GRB170807A/GW170817. Nevertheless, there remain questions as to the contribution over the history of the Galaxy to the current solar-system r-process abundances from other sites such as neutrino-driven winds or magnetohydrodynamical ejection of material from core-collapse supernovae. In this review we highlight some current issues surrounding the nuclear physics input, astronomical observations, galactic chemical evolution, and theoretical simulations of r-process astrophysical environments with the goal of outlining a path toward resolving the remaining mysteries of the r process.

    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1906.05002 [pdf]
    PPNP(2019)·189 citations
  4. 05

    [Submitted on 12 Jun 2019] (cross-list from hep-ph)

    Signatures of chiral symmetry restoration in dilepton production

    Chihiro Sasaki🇵🇱

    We study the structural change of the vector spectral function and integrated production rates of dileptons in the presence of the chiral mixing induced exclusively at finite density. The mixing produces multiple bumps and peaks around the vacuum masses of the and resonances in the spectral function. The arising modification becomes pronounced when the mass difference between parity partners decreases. In particular, the emergent enhancement around the vacuum meson in the production rates serves as an excellent signature of the partially-restored chiral symmetry in heavy-ion collisions.

    Comments:
    v2: 6 pages, 4 figures, the version accepted for publication in Physics Letters B
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1906.05077 [pdf]
    PLB(2020)·21 citations
  5. 06

    [Submitted on 12 Jun 2019] (cross-list from hep-th)

    Asymmetric shockwave collisions in

    Sebastian Waeber🇩🇪 · Andreas Rabenstein🇩🇪 · Andreas Schäfer🇩🇪 · Laurence G. Yaffe🇺🇸

    Collisions of asymmetric planar shocks in maximally supersymmetric Yang-Mills theory are studied via their dual gravitational formulation in asymptotically anti-de Sitter spacetime. The post-collision hydrodynamic flow is found to be very well described by appropriate means of the results of symmetric shock collisions. This study extends, to asymmetric collisions, previous work of Chesler, Kilbertus, and van der Schee examining the special case of symmetric collisions. Given the universal description of hydrodynamic flow produced by asymmetric planar collisions one can model, quantitatively, non-planar, non-central collisions of highly Lorentz contracted projectiles without the need for computing, holographically, collisions of finite size projectiles with very large aspect ratios. This paper also contains a pedagogical description of the computational methods and software used to compute shockwave collisions using pseudo-spectral methods, supplementing the earlier overview of Chesler and Yaffe.

    Comments:
    51 pages, 12 figures
    Subjects:
    High Energy Physics — Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1906.05086 [pdf]
    JHEP(2019)·18 citations
  6. 07

    [Submitted on 12 Jun 2019] (cross-list from astro-ph.HE)

    Impact of electron capture rates on nuclei far from stability on core-collapse supernovae

    Aurélien Pascal (LUTH)🇫🇷 · Simon Giraud (GANIL)🇫🇷 · Anthea Fantina (GANIL)🇫🇷 · Francesca Gulminelli (LPCC)🇫🇷 · Jerome Novak (LUTH)🇫🇷 · Micaela Oertel (LUTH)🇫🇷 · Adriana Raduta (NIPNE)🇷🇴

    The impact of electron-capture (EC) cross sections on neutron-rich nuclei on the dynamics of core-collapse during infall and early post-bounce is studied performing spherically symmetric simulations in general relativity using a multigroup scheme for neutrino transport and full nuclear distributions in extended nuclear statistical equilibrium models. We thereby vary the prescription for EC rates on individual nuclei, the nuclear interaction for the EoS, the mass model for the nuclear statistical equilibrium distribution and the progenitor model. In agreement with previous works, we show that the individual EC rates are the most important source of uncertainty in the simulations, while the other inputs only marginally influence the results. A recently proposed analytic formula to extrapolate microscopic results on stable nuclei for EC rates to the neutron rich region, with a functional form motivated by nuclear-structure data and parameters fitted from large scale shell model calculations, is shown to lead to a sizable (16%) reduction of the electron fraction at bounce compared to more primitive prescriptions for the rates, leading to smaller inner core masses and slower shock propagation. We show that the EC process involves 130 different nuclear species around 86 Kr mainly in the N = 50 shell closure region, and establish a list of the most important nuclei to be studied in order to constrain the global rates.

    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    1906.05114 [pdf]
    PRC(2020)·21 citations
  7. 08

    [Submitted on 12 Jun 2019] (cross-list from hep-ph)

    Transport anomalies near the QCD phase transition at finite density

    B.O. Kerbikov🇷🇺

    We show that at finite density pressure-pressure and current-current correlators exhibit divergences at owing to the fluctuations of the diquark field. Specifically, this leads to a significant excess of the soft photon production rate near .

    Comments:
    3 pages, 1 figure; contribution to the 2019 QCD session of the 54th Rencontres de Moriond
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1906.05128 [pdf]
    0 citations

Affiliations

first authorsco-authorsvia INSPIRE