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Nuclear Theory·nucl-th

Friday·March 27, 2020

9 papers—3 primary·6 cross-listed

All9Primary3Cross-lists6
  1. 04

    [Submitted on 25 Mar 2020] (cross-list from hep-ph)

    Nucleon elastic form factors at accessible large spacelike momenta

    Zhu-Fang Cui🇨🇳 · Chen Chen🇩🇪 · Daniele Binosi🇮🇹 · Feliciano De Soto🇪🇸 · Craig D. Roberts🇨🇳 · Jose Rodriguez-Quintero🇪🇸 · Sebastian M. Schmidt🇩🇪 · Jorge Segovia🇪🇸

    A Poincaré-covariant quark+diquark Faddeev equation is used to compute nucleon elastic form factors on ( is the nucleon mass) and elucidate their role as probes of emergent hadronic mass in the Standard Model. The calculations expose features of the form factors that can be tested in new generation experiments at existing facilities, e.g. a zero in ; a maximum in ; and a zero in the proton's -quark Dirac form factor, . Additionally, examination of the associated light-front-transverse number and anomalous magnetisation densities reveals, inter alia: a marked excess of valence -quarks in the neighbourhood of the proton's centre of transverse momentum; and that the valence -quark is markedly more active magnetically than either of the valence -quarks. The calculations and analysis also reveal other aspects of nucleon structure that could be tested with a high-luminosity accelerator capable of delivering higher beam energies than are currently available.

    Comments:
    14 pages, 9 figures, 1 table
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2003.11655 [pdf]
    PRD(2020)·52 citations
  2. 05

    [Submitted on 26 Mar 2020] (cross-list from physics.data-an)

    A Comprehensive Monte Carlo Framework for Jet-Quenching

    R.A. Soltz🇺🇸

    This article presents the motivation for developing a comprehensive modeling framework in which different models and parameter inputs can be compared and evaluated for a large range of jet-quenching observables measured in relativistic heavy-ion collisions at RHIC and the LHC. The concept of a framework us discussed within the context of recent efforts by the JET Collaboration, the authors of JEWEL, and the JETSCAPE collaborations. The framework ingredients for each of these approaches is presented with a sample of important results from each. The role of advanced statistical tools in comparing models to data is also discussed, along with the need for a more detailed accounting of correlated errors in experimental results.

    Comments:
    8 pages, 8 figures, contribution to the Quark Matter 2019 proceedings
    Subjects:
    Data Analysis, Statistics and Probability (physics.data-an); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2003.11728 [pdf]
    NPA(2021)·2 citations
  3. 06

    [Submitted on 26 Mar 2020] (cross-list from hep-ph)

    Searching for New Physics in Two-Neutrino Double Beta Decay

    Frank F. Deppisch🇬🇧 · Lukas Graf🇩🇪 · Fedor Šimkovic🇷🇺

    Motivated by non-zero neutrino masses and the possibility of New Physics discovery, a number of experiments search for neutrinoless double beta decay. While hunting for this hypothetical nuclear process, a significant amount of two-neutrino double beta decay data has become available. Although these events are regarded and studied mostly as the background of neutrinoless double beta decay, they can be also used to probe physics beyond the Standard Model. In this paper we show how the presence of right-handed leptonic currents would affect the energy distribution and angular correlation of the outgoing electrons in two-neutrino double beta decay. Consequently, we estimate constraints imposed by currently available data on the existence of right-handed neutrino interactions without having to assume their nature. In this way our results complement the bounds coming from the non-observation of neutrinoless double beta decay as they limit also the exotic interactions of Dirac neutrinos. We perform a detailed calculation of two-neutrino double beta decay under the presence of exotic (axial-)vector currents and we demonstrate that current experimental searches can be competitive to existing limits.

    Comments:
    29 pages, 6 figures, including appendix; v2 matches published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2003.11836 [pdf]
    PRL(2020)·59 citations
  4. 07

    [Submitted on 26 Mar 2020] (cross-list from hep-ph)

    Shadowing in inelastic nucleon-nucleon cross section?

    Kari J. Eskola🇫🇮 · Ilkka Helenius🇫🇮 · Mikko Kuha🇫🇮 · Hannu Paukkunen🇫🇮

    Experimental results of inclusive hard-process cross sections in heavy-ion collisions conventionally lean on a normalization computed from Glauber models where the inelastic nucleon-nucleon cross section -- a crucial input parameter -- is simply taken from proton-proton measurements. In this letter, using the computed electro-weak boson production cross sections in lead-lead collisions as a benchmark, we determine from the recent ATLAS data. We find a significantly suppressed relative to what is usually assumed, show the consequences for the centrality dependence of the cross sections, and address the phenomenon in an eikonal minijet model with nuclear shadowing.

    Comments:
    6 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2003.11856 [pdf]
    PRL(2020)·25 citations
  5. 08

    [Submitted on 26 Mar 2020] (cross-list from hep-ph)

    Fermionic excitations at finite temperature and density

    Ralf-Arno Tripolt🇩🇪 · Dirk H. Rischke🇩🇪 · Lorenz von Smekal🇩🇪 · Jochen Wambach🇮🇹

    We study fermionic excitations in a hot and dense strongly interacting medium consisting of quarks and (pseudo-)scalar mesons. In particular, we use the two-flavor quark-meson model in combination with the Functional Renormalization Group approach, which allows to take into account the effects from thermal and quantum fluctuations. The resulting fermionic excitation spectrum is investigated by calculating the quark spectral function at finite temperature, quark chemical potential, and spatial momentum. This involves an analytic continuation from imaginary to real energies by extending the previously introduced analytically-continued FRG (aFRG) method to the present case. We identify three different collective excitations in the medium: the ordinary thermal quark, the plasmino mode, and an ultra-soft "phonino" mode. The dispersion relations of these modes are extracted from the quark spectral function. When compared to corresponding results from an FRG-improved one-loop calculation remarkable agreement is found.

    Comments:
    17 pages, 9 figures, v2 agrees with published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2003.11871 [pdf]
    PRD(2020)·15 citations
  6. 09

    [Submitted on 26 Mar 2020] (cross-list from hep-ph)

    Mutual assistance between the Schwinger mechanism and the dynamical Casimir effect

    Hidetoshi Taya🇨🇳

    We study massive charged particle production from the vacuum confined between two vibrating plates in the presence of a strong electric field. We analytically derive a formula for the production number based on the perturbation theory in the Furry picture, and show that the Schwinger mechanism by the strong electric field and the dynamical Casimir effect by the vibration assist with each other to dramatically enhance the production number by orders of the magnitude.

    Comments:
    16 pages, 5 figures; v2: typos corrected, references added, version to be published in PRR
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th); Plasma Physics (physics.plasm-ph); Quantum Physics (quant-ph)
    arXiv:
    2003.12061 [pdf]
    PRResearch(2020)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE