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Nuclear Theory·nucl-th

Monday·October 1, 2018

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 05

    [Submitted on 27 Sept 2018] (cross-list from hep-ph)

    Jet shape modifications in holographic dijet systems

    Jasmine Brewer🇺🇸 · Andrey Sadofyev🇺🇸 · Wilke van der Schee🇺🇸

    We present a coherent model that combines jet production from perturbative QCD with strongly-coupled jet-medium interactions described in holography. We use this model to study the modification of an ensemble of jets upon propagation through a quark-gluon plasma resembling central heavy ion collisions. Here the modification of the dijet asymmetry depends strongly on the subleading jet width, which can therefore be an important observable for studying jet-medium interactions. We furthermore show that the modification of the shape of the leading jet is relatively insensitive to the dijet asymmetry, whereas the subleading jet shape modification is much larger for more imbalanced dijets. Finally, we compare the results of our holographic model to a recent CMS measurement.

    Comments:
    6 pages, 4 figures, v3 matches published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1809.10695 [pdf]
    PLB(2021)·23 citations
  2. 06

    [Submitted on 27 Sept 2018] (cross-list from nucl-ex)

    Weak-Interaction Tests via Precision Superallowed -Decay Studies at TRIUMF

    Kyle G. Leach🇺🇸 · Jason D. Holt🇨🇦

    Superallowed -decay studies provide some of the best constraints on the possibility of additional quark generations, as well as limits on exotic currents in the weak interaction. The three experimental quantities that are required for performing these tests using nuclear decays (branching ratio, half-life, and -value) can all be measured to high-precision with rare-isotope beams at the TRIUMF-ISAC facility in Vancouver, Canada. This proceeding presents a brief outline of the general experimental techniques used at TRIUMF over the past 15 years, as well as recent theoretical advances towards {\it ab-initio} isospin-symmetry-breaking corrections to superallowed nuclear decays.

    Comments:
    Talk presented at CIPANP2018. 12 pages, LaTeX, 2 png figures
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1809.10793 [pdf]
    3 citations
  3. 07

    [Submitted on 28 Sept 2018] (cross-list from hep-ph)

    Form factors for pions couplings to constituent quarks under weak magnetic field

    Fabio L. Braghin🇧🇷 · Willian F. de Sousa🇧🇷

    By considering a one loop background field method for a nonperturbative one gluon exchange between quarks, leading electromagnetic form factors of pion couplings to constituent quarks are derived by means of from a large quark and gluon effective masses expansion. With this calculation the leading anisotropic corrections induced by a weak magnetic field for the pion-constituent quark form factors are obtained. Besides that, few effective couplings which emerge only due to the weak magnetic field that break chiral and isospin symmetry are also found. Numerical estimations for these magnetic field corrections are presented for two different nonperturbative gluon propagators. All of these corrections are ultraviolet finite and their relative values are found to be of order of being for the vector and axial pion couplings and for the pseudoscalar and scalar ones. The corresponding anisotropic corrections to the Strong averaged quadratic radii in the plane perpendicular to the magnetic field are also calculated as functions of the quark effective mass.

    Comments:
    20 pages, revised, reduced and improved manuscript, 7 figures, with some more calculation
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1809.10823 [pdf]
    J.Phys.G(2020)·9 citations
  4. 08

    [Submitted on 28 Sept 2018] (cross-list from nucl-ex)

    Binding-energy independence of reduced single particle strengths derived from reactions

    Y.P. Xu · D.Y. Pang · X.Y. Yun · C. Wen · C.X. Yuan · J.L. Lou

    An overall reduction factor (ORF) is introduced for studying the quenching of single particle strengths through nucleon transfer reactions. The ORF includes contributions of all the probed bound states of the residual nucleus in a transfer reaction and permits a proper comparison with results of inclusive knockout reactions. A systematic analysis is made with 103 sets of angular distribution data of reactions on 21 even-even targets with atomic mass numbers from 8 to 56 using the consistent three-body model reaction methodology proposed in [J. Lee, J.A. Tostevin, B.A. Brown, et al., Phys. Rev. C 73, 044608 (2006)]. The extracted ORFs are found to be nearly independent on the nuclear isospin asymmetry, which is different from the systematics of inclusive knockout reactions but is consistent with the recent measurement of , , , and reactions on nitrogen and oxygen isotopes and \textit{ab initio} calculations.

    Comments:
    15 pages, 3 figures
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1809.11139 [pdf]
    0 citations

Affiliations

first authorsco-authorsvia INSPIRE