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Nuclear Theory·nucl-th

Friday·January 30, 2015

6 papers—2 primary·4 cross-listed

All6Primary2Cross-lists4
  1. 03

    [Submitted on 16 Jan 2015] (cross-list from hep-ph)

    Quarkonium Binding and Entropic Force

    Helmut Satz🇩🇪

    A Q-Qbar bound state represents a balance between repulsive kinetic and attractive potential energy. In a hot quark-gluon plasma, the interaction potential experiences medium effects. Color screening modifies the attractive binding force between the quarks, while the increase of entropy with Q-Qbar separation gives rise to a growing repulsion. We study the role of these phenomena for in-medium Q-Qbar binding and dissociation. It is found that the relevant potential for Q-Qbar binding is the free energy F; with increasing Q-Qbar separation, further binding through the internal energy U is compensated by repulsive entropic effects.

    Comments:
    11 pages, 8 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1501.03940 [pdf]
    EPJC(2015)·16 citations
  2. 04

    [Submitted on 28 Jan 2015] (cross-list from hep-ph)

    Polarization effects in double open-charm production at LHCb

    Miguel G. Echevarria🇳🇱 · Tomas Kasemets🇳🇱 · Piet J. Mulders🇳🇱 · Cristian Pisano🇳🇱

    Double open-charm production is one of the most promising channels to disentangle single from double parton scattering (DPS) and study different properties of DPS. Several studies of the DPS contributions have been made. A missing ingredient so far has been the study of polarization effects, arising from spin correlations between the two partons inside an unpolarized proton. We investigate the impact polarization has on the double open-charm cross section. We show that the longitudinally polarized gluons can give significant contributions to the cross section, but for most of the considered kinematic region only have a moderate effect on the shape. We compare our findings to the LHCb data in the D0D0 final state, identify observables where polarization does have an impact on the distribution of the final state particles, and suggest measurements which could lead to first experimental indications of, or limits on, polarization in DPS.

    Comments:
    16 pages, 13 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1501.07291 [pdf]
    JHEP(2015)·32 citations
  3. 05

    [Submitted on 29 Jan 2015] (cross-list from physics.atom-ph)

    Nuclear structure effects in light muonic atoms

    Krzysztof Pachucki · Albert Wienczek

    Nuclear structure corrections to energy levels of light muonic atoms are derived with particular attention to the nuclear mass dependence. The obtained result for the 2P-2S transition of 1.717(19) meV serves for determination of the nuclear charge radius from the spectroscopic measurement in muonic deuterium.

    Comments:
    6 pages, 1 table, published version
    Subjects:
    Atomic Physics (physics.atom-ph); Nuclear Theory (nucl-th)
    arXiv:
    1501.07451 [pdf]
    PRA(2015)·48 citations
  4. 06

    [Submitted on 29 Jan 2015] (cross-list from physics.acc-ph)

    Modelling proton-induced reactions at low energies in the MARS15 code

    Igor L. Rakhno · Nikolai V. Mokhov (Fermilab) Konstantin K. Gudima (IAP, Chisinau)

    An implementation of both the ALICE code and TENDL evaluated nuclear data library in order to describe nuclear reactions by low-energy projectiles in the Monte Carlo code MARS15 is presented. Comparisons between results of modelling and experimental data on reaction cross sections and secondary particle distributions are shown as well.

    Comments:
    11 pp. Presented at the 12th Meeting on Shielding Aspects of Accelerators, Targets and Irradiation Facilities (SATIF-12), April 28-30, 2014, Fermi National Accelerator Laboratory, Batavia, Illinois, USA
    Subjects:
    Accelerator Physics (physics.acc-ph); Nuclear Theory (nucl-th)
    arXiv:
    1501.07597 [pdf]
    1 citation

Affiliations

first authorsco-authorsvia INSPIRE