PaperPanorama
FAQ

Nuclear Theory·nucl-th

Wednesday·June 15, 2016

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 05

    [Submitted on 12 Jun 2016] (cross-list from cond-mat.quant-gas)

    Mobile impurity in a Fermi sea from the functional renormalization group analytically continued to real time

    Kazuhiko Kamikado · Takuya Kanazawa · Shun Uchino

    Motivated by experiments with cold atoms, we investigate a mobile impurity immersed in a Fermi sea in three dimensions at zero temperature by means of the functional renormalization group. We first perform the derivative expansion of the effective action to calculate the ground state energy and Tan's contact across the polaron-molecule transition for several mass imbalances. Next we study quasiparticle properties of the impurity by using a real-time method recently developed in nuclear physics, which allows one to go beyond the derivative expansion. We obtain the spectral function of the polaron, the effective mass and quasiparticle weight of attractive and repulsive polarons, and clarify how they are affected by mass imbalances.

    Comments:
    12 pages
    Subjects:
    Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th)
    arXiv:
    1606.03721 [pdf]
    PRA(2017)·21 citations
  2. 06

    [Submitted on 13 Jun 2016] (cross-list from hep-ph)

    Stability of the pion string in a thermal and dense medium

    Arjun Berera🇬🇧 · Robert Brandenberger🇨🇦 · Joel Mabillard🇬🇧 · Rudnei O. Ramos🇧🇷

    We investigate the stability of the pion string in a thermal bath and a dense medium. We find that stability is dependent on the order of the chiral transition. String core stability within the experimentally allowed regime is found only if the chiral transition is second order, and even there the stable region is small, i.e., the temperature below which the core is unstable is close to the critical temperature of the phase transition. We also find that the presence of a dense medium, in addition to the thermal bath, enhances the experimentally accessible region with stable strings. We also argue that once the string core decays, the "effective winding" of the string persists at large distances from the string core. Our analysis is done both in the chiral limit, which is mainly what has been explored in the literature up to now, and for the physical case, where a conceptual framework is set up for addressing this regime and some simple estimates are done.

    Comments:
    16 pages, 6 figures. Replaced with version matching the published one
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1606.04113 [pdf]
    PRD(2016)·5 citations
  3. 07

    [Submitted on 13 Jun 2016] (cross-list from hep-ph)

    Theoretical predictions of transverse kinematic imbalance in neutrino-nucleus interactions

    Luke Pickering🇬🇧 · Xianguo Lu🇬🇧

    Distributions of transverse kinematic imbalance in neutrino-nucleus interactions in the few GeV regime are sensitive to nuclear effects. We present a study comparing the latest predictions of transverse kinematic imbalance from the interaction simulations, NuWro and GENIE. We dis- cuss the differences between the model predictions.

    Comments:
    5 pages, 9 figures, NuPhys 2015 poster session proceedings
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1606.04403 [pdf]
    6 citations
  4. 08

    [Submitted on 14 Jun 2016] (cross-list from hep-lat)

    Gluonic Transversity from Lattice QCD

    W. Detmold🇺🇸 · P. E. Shanahan🇺🇸

    We present an exploratory study of the gluonic structure of the meson using lattice QCD (LQCD). This includes the first investigation of gluonic transversity via the leading moment of the twist-two double-helicity-flip gluonic structure function . This structure function only exists for targets of spin and does not mix with quark distributions at leading twist, thereby providing a particularly clean probe of gluonic degrees of freedom. We also explore the gluonic analogue of the Soffer bound which relates the helicity flip and non-flip gluonic distributions, finding it to be saturated at the level of 80%. This work sets the stage for more complex LQCD studies of gluonic structure in the nucleon and in light nuclei where is an 'exotic glue' observable probing gluons in a nucleus not associated with individual nucleons.

    Subjects:
    High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1606.04505 [pdf]
    PRD(2016)·27 citations

Affiliations

first authorsco-authorsvia INSPIRE