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Nuclear Theory·nucl-th

Thursday·September 27, 2018

7 papers—5 primary·2 cross-listed

All7Primary5Cross-lists2
  1. 06

    [Submitted on 25 Sept 2018] (cross-list from physics.atom-ph)

    The Proton Radius Puzzle- Why We All Should Care

    Gerald A. Miller🇺🇸

    The status of the proton radius puzzle (as of the date of the Confer- ence) is reviewed. The most likely potential theoretical and experimental explanations are discussed. Either the electronic hydrogen experiments were not sufficiently accurate to measure the proton radius, the two- photon exchange effect was not properly accounted for, or there is some kind of new physics. I expect that upcoming experiments will resolve this issue within the next year or so.Ta

    Comments:
    Talk Presented at CIPANP2018, 8 pages, Latex. 2 pdf figures. Report No: CIPANP2018-Miller
    Subjects:
    Atomic Physics (physics.atom-ph); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1809.09635 [pdf]
    2 citations
  2. 07

    [Submitted on 26 Sept 2018] (cross-list from hep-ph)

    Inhomogeneous chiral phases away from the chiral limit

    Michael Buballa🇩🇪 · Stefano Carignano🇪🇸

    The effect of explicit chiral-symmetry breaking on inhomogeneous chiral phases is studied within a Nambu-Jona-Lasinio model with nonzero current quark mass. Generalizing an earlier result obtained in the chiral limit, we show within a Ginzburg-Landau analysis that the critical endpoint of the first-order chiral phase boundary between two homogeneous phases gets replaced by a "pseudo-Lifshitz point" when the possibility of inhomogeneous order parameters is considered. Performing a stability analysis we also show that the unstable mode along the phase boundary is in the scalar but not in the pseudoscalar channel, suggesting that modulations which contain pseudoscalar condensates, like a generalized dual chiral density wave, are disfavored against purely scalar ones. Numerically we find that the inhomogeneous phase shrinks as one moves away from the chiral limit, but survives even at significantly large values of the current quark mass.

    Comments:
    9 pages, 4 figures; v2: reference and minor typos corrected; v3: references added, comment on fluctuation effects, version accepted for publication at Phys. Lett. B
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1809.10066 [pdf]
    PLB(2019)·50 citations

Affiliations

first authorsco-authorsvia INSPIRE