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Nuclear Theory·nucl-th

Monday·February 8, 2016

6 papers—2 primary·4 cross-listed

All6Primary2Cross-lists4
  1. 03

    [Submitted on 4 Feb 2016] (cross-list from astro-ph.HE)

    Thermal conductivity and impurity scattering in the accreting neutron star crust

    Alessandro Roggero · Sanjay Reddy

    We calculate the thermal conductivity of electrons for the strongly correlated multi-component ion plasma expected in the outer layers of neutron star's crust employing a Path Integral Monte Carlo (PIMC) approach. This allows us to isolate the low energy response of the ions and use it to calculate the electron scattering rate and the electron thermal conductivity. We find that the scattering rate is enhanced by a factor 2-4 compared to earlier calculations based on the simpler electron-impurity scattering formalism. This findings directly impacts the interpretation of thermal relaxation observed in transiently accreting neutron stars and has implications for the composition and nuclear reactions in the crust that occur during accretion.

    Comments:
    Revised version addressing referee comments
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    1602.01831 [pdf]
    PRC(2016)·25 citations
  2. 04

    [Submitted on 5 Feb 2016] (cross-list from hep-ph)

    Reply to "Comment on `Breakdown of the expansion of finite-size corrections to the hydrogen Lamb shift in moments of charge distribution'"

    Franziska Hagelstein🇩🇪 · Vladimir Pascalutsa (KPH, JGU Mainz)🇩🇪

    To comply with the critique of the Comment [J. Arrington, arXiv:1602.01461], we consider another modification of the proton electric form factor, which resolves the "proton-radius puzzle". The proposed modification satisfies all the consistency criteria put forward in the Comment, and yet has a similar impact on the puzzle as that of the original paper. Contrary to the concluding statement of the Comment, it is not difficult to find an ad hoc modification of the form factor at low that resolves the discrepancy and is consistent with analyticity constraints. We emphasize once again that we do not consider such an ad hoc modification of the proton form factor to be a solution of the puzzle until a physical mechanism for it is found.

    Comments:
    3 pages, 3 figures, 1 table, to appear in Phys. Rev. A, corrected typo in caption of fig. 1
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th); Atomic Physics (physics.atom-ph)
    arXiv:
    1602.01978 [pdf]
    PRA(2016)·2 citations
  3. 05

    [Submitted on 5 Feb 2016] (cross-list from hep-ph)

    PDFs from nucleons to nuclei

    Alberto Accardi🇺🇸

    I review recent progress in the extraction of unpolarized parton distributions in the proton and in nuclei from a unified point of view that highlights how the interplay between high energy particle physics and lower energy nuclear physics can be of mutual benefit to either field. Areas of overlap range from the search for physics beyond the standard model at the LHC, to the study of the non perturbative structure of nucleons and the emergence of nuclei from quark and gluon degrees of freedom, to the interaction of colored probes in a cold nuclear medium.

    Comments:
    Pleanary talk delivered at DIS 2015, Dallas, TX (USA), 27 April - May 1 2015
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1602.02035 [pdf]
    PoS(2015)·14 citations
  4. 06

    [Submitted on 5 Feb 2016] (cross-list from hep-ph)

    On the uncertainty estimates of the -pole determination by Padé approximants

    Irinel Caprini🇷🇴 · Pere Masjuan🇩🇪 · Jacobo Ruiz de Elvira🇩🇪 · Juan José Sanz-Cillero🇪🇸

    We discuss the determination of the (or ) resonance by analytic continuation through Padé approximants of the -scattering amplitude from the physical region to the pole in the complex energy plane. The aim is to analyze the uncertainties of the method, having in view the fact that analytic continuation is an ill-posed problem in the sense of Hadamard. Using as input a class of admissible parameterizations of the scalar-isoscalar partial wave, which satisfy with great accuracy the same set of dispersive constraints, we find that the Roy-type integral representations lead to almost identical pole positions for all of them, while the predictions of the Padé approximants have a larger spread, being sensitive to features of the input parameterization that are not controlled by the dispersive constraints. Our conservative conclusion is that the -pole determination by Padé approximants is consistent with the prediction of Roy-type equations, but has an uncertainty almost a factor two larger.

    Comments:
    11 pages, 13 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1602.02062 [pdf]
    PRD(2016)·43 citations

Affiliations

first authorsco-authorsvia INSPIRE