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Nuclear Theory·nucl-th

Thursday·November 28, 2019

13 papers—8 primary·5 cross-listed

All13Primary8Cross-lists5
  1. 09

    [Submitted on 27 Nov 2019] (cross-list from hep-ph)

    Light (anti-)nuclei and (anti-)hypertriton production in collisions at and TeV

    Nserdin A. Ragab🇨🇳 · Zhi-Lei She🇨🇳 · Gang Chen🇨🇳

    Production of light (anti-)nuclei and (anti-)hypertriton within midrapidity () and GeV/c in interactions at = 0.90, 2.76 and 7 TeV is investigated by the dynamically constrained phase space coalescence model (DCPC), combined with {\footnotesize{PACIAE}} model. The ALICE data for yields, ratios, as well as transverse momentum distributions of and are well reproduced by the model simulations, meanwhile the three basic characters of , , , and are also predicted. Besides, we found the yields of light (anti-)nuclei produced are dependent upon their mass number , namely, their yields sharply decrease with the increasing of . The strangeness population factor is found to be about 0.7 0.8, and is comparable with the available experimental results.

    Comments:
    7pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1911.11919 [pdf]
    Eur.Phys.J.Plus(2020)·5 citations
  2. 10

    [Submitted on 27 Nov 2019] (cross-list from hep-ph)

    Infrared renormalon effects in color dipole TMD PDF at small-

    Nahid Vasim🇮🇳 · Raktim Abir🇮🇳

    The uncertainties from the infrared renormalons in the (color dipole) gluon distribution is estimated. It is shown that non-linear saturation effects at small- shift the first IR pole at the Borel plane from to . As a consequence the estimated uncertainty is found to be instead of .

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1911.12055 [pdf]
    NPB(2020)·1 citation
  3. 11

    [Submitted on 27 Nov 2019] (cross-list from hep-ph)

    Quark condensate seesaw mechanism for neutrino mass

    A. Babič🇨🇿 · S. Kovalenko🇨🇱 · M. I. Krivoruchenko🇷🇺 · F. Šimkovic🇨🇿

    We study a mechanism of generation of Majorana neutrino mass due to spontaneous breaking of chiral symmetry (SBCS) accompanied by the formation of a quark condensate. The effect of the condensate is transmitted to the neutrino sector via Lepton-Number Violating (LNV) lepton-quark dimension- operators known in the literature as an origin of the neutrino-mass-independent mechanism of neutrinoless double-beta () decay. The smallness of neutrino masses is due to a large ratio between the LNV scale and the scale of the SBCS. This is a new realization of the seesaw mechanism, which we dub the Quark Condensate SeeSaw (QCSS). We examine the predictions of the QCSS for -decay and neutrino mass spectrum. We will show that our model predicts the normal neutrino mass ordering and narrow ranges of the neutrino masses.

    Comments:
    11 pages, 3 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1911.12189 [pdf]
    PRD(2021)·10 citations
  4. 12

    [Submitted on 27 Nov 2019] (cross-list from hep-lat)

    Exploring the QCD phase diagram via reweighting from isospin chemical potential

    Bastian B. Brandt🇩🇪 · Francesca Cuteri🇩🇪 · Gergely Endrodi🇩🇪 · Sebastian Schmalzbauer🇩🇪

    We investigate the QCD phase diagram for small values of baryon and strange quark chemical potentials from simulations at non-zero isospin chemical potential. Simulations at pure isospin chemical potential are not hindered by the sign problem and pion condensation can be observed for sufficiently large isospin chemical potentials. We study how the related phase boundary evolves with baryonic and strange chemical potentials via reweighting in quark chemical potentials and discuss our results. Furthermore, we propose and implement an alternative method to approach nonzero baryon (and strange quark) chemical potentials. This method involves simulations where physical quarks are paired with auxiliary quarks in unphysical "isospin" doublets and a decoupling of the auxiliary quarks by mass reweighting.

    Comments:
    7 pages, 7 figures, Proceedings of the 37th International Symposium on Lattice Field Theory, Wuhan, China
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1911.12197 [pdf]
    PoS(2019)·10 citations
  5. 13

    [Submitted on 27 Nov 2019] (cross-list from hep-lat)

    Evading the model sign problem in the PNJL model with repulsive vector-type interaction via path optimization

    Akira Ohnishi🇯🇵 · Yuto Mori🇯🇵 · Kouji Kashiwa🇯🇵

    We discuss the sign problem in the Polyakov loop extended Nambu--Jona-Lasinio model with repulsive vector-type interaction by using the path optimization method. In this model, both of the Polyakov loop and the vector-type interaction cause the model sign problem, and several prescriptions have been utilized even in the mean field treatment. In the path optimization method, integration variables are complexified and the integration path (manifold) is optimized to evade the sign problem, or equivalently to enhance the average phase factor. Within the homogeneous field ansatz, the path is optimized by using the feedforward neural network. We find that the assumptions adopted in previous works, and , can be justified from the Monte-Carlo configurations sampled on the optimized path. We also derive the Euler-Lagrange equation for the optimal path to satisfy. The two optimized paths, the solution of the Euler-Lagrange equation and the variationally optimized path, agree with each other in the region with large statistical weight.

    Comments:
    Talk given at the 37th International Symposium on Lattice Field Theory, June 16-22, 2019, Wuhan, China. 7 pages, 3 figures
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1911.12288 [pdf]
    PoS(2019)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE