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Nuclear Theory·nucl-th

Friday·May 15, 2015

5 papers—3 primary·2 cross-listed

All5Primary3Cross-lists2
  1. 01

    [Submitted on 13 May 2015]

    Dominant contributions to the nucleon-nucleon interaction at sixth order of chiral perturbation theory

    D. R. Entem · N. Kaiser · R. Machleidt · Y. Nosyk

    We present the dominant two- and three-pion-exchange contributions to the nucleon-nucleon interaction at sixth order (next-to-next-to-next-to-next-to-next-to-leading order, N5LO) of chiral perturbation theory. Phase shifts with orbital angular momentum L>=4 are given parameter free at this order and allow for a systematic investigation of the convergence of the chiral expansion. The N5LO contribution is prevailingly repulsive and considerably smaller than the N4LO one, thus, establishing the desired trend towards convergence. Using low-energy constants that were extracted from an analysis of pi-N scattering at fourth order, the predictions at N5LO are in excellent agreement with the empirical phase shifts of peripheral partial waves.

    Comments:
    16 pages, 8 figures. arXiv admin note: text overlap with arXiv:1411.5335
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1505.03562 [pdf]
    PRC(2015)·104 citations
  2. 02

    [Submitted on 14 May 2015]

    Microscopic Study of (p,) Reactions in Mass Region A=110-125

    Dipti Chakraborty · Saumi Dutta · G. Gangopadhyay · Abhijit Bhattacharyya

    Low energy proton capture reactions have been studied in statistical model using the semi-microscopic optical potential in the mass range A=110-125. Nuclear density obtained from relativistic mean field calculation has been folded with nucleon-nucleon interaction to obtain the optical potential. Theoretical results have been compared with experimental measurements to normalize the potential. Results have also been compared with a standard calculation available in the literature.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1505.03633 [pdf]
    PRC(2015)·7 citations
  3. 03

    [Submitted on 14 May 2015]

    Quarteting and spin-aligned proton-neutron pairs in heavy N=Z nuclei

    M. Sambataro · N. Sandulescu

    We analyze the role of maximally aligned isoscalar pairs in heavy nuclei by employing a formalism of quartets. Quartets are superpositions of two neutrons and two protons coupled to total isospin and given . The study is focused on the contribution of spin-aligned pairs carrying the angular momentum to the structure of Cd and Pd. We show that the role played by the pairs is quite sensitive to the model space and, in particular, it decreases considerably by passing from the simple space to the more complete ,,, space. In the latter case the description of these nuclei in terms of only spin-aligned pairs turns out to be unsatisfactory while an important contribution, particularly in the ground state, is seen to arise from isovector and isoscalar pairs. Thus, contrary to previous studies, we find no compelling evidence of a spin-aligned pairing phase in Pd.

    Comments:
    6 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1505.03751 [pdf]
    PRC(2015)·20 citations
  4. 04

    [Submitted on 13 May 2015] (cross-list from hep-ph)

    Photon-tagged and B-meson-tagged b-jet production at the LHC

    Jinrui Huang🇺🇸 · Zhong-Bo Kang🇺🇸 · Ivan Vitev🇺🇸 · Hongxi Xing🇺🇸

    Tagged jet measurements in high energy hadronic and nuclear reactions provide constraints on the energy and parton flavor origin of the parton shower that recoils against the tagging particle. Such additional insight can be especially beneficial in illuminating the mechanisms of heavy flavor production in proton-proton collisions at the LHC and their modification in the heavy ion environment, which are not fully understood. With this motivation, we present theoretical results for isolated-photon-tagged and B-meson-tagged b-jet production at center-of-mass energy 5.1 TeV for comparison to the upcoming lead-lead data. We find that photon-tagged b-jets exhibit smaller momentum imbalance shift in nuclear matter, and correspondingly smaller energy loss, than photon-tagged light flavor jets. Our results show that B-meson tagging is most effective in ensuring that the dominant fraction of recoiling jets originate from prompt b-quarks. Interestingly, in this channel the large suppression of the cross section is not accompanied by a significant momentum imbalance shift.

    Comments:
    9 pages, 6 figures, 1 table; typos in text fixed, extended discussion added
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1505.03517 [pdf]
    PLB(2015)·26 citations
  5. 05

    [Submitted on 14 May 2015] (cross-list from hep-ph)

    Hadronization Scheme Dependence of Long-Range Azimuthal Harmonics in High Energy p+A Reactions

    Angelo Esposito🇺🇸 · Miklos Gyulassy🇺🇸

    We compare the distortion effects of three popular final-state hadronization schemes. We show how hadronization modifies the initial-state gluon correlations in high energy p+A collisions. The three models considered are (1) LPH: local parton-hadron duality, (2) CPR: collinear parton- hadron resonance independent fragmentation, and (3) LUND: color string hadronization. The strong initial-state azimuthal asymmetries are generated using the GLVB model for non-abelian gluon bremsstrahlung, assuming a saturation scale Qsat = 2 GeV. Long-range elliptic and triangular harmonics for the final hadron pairs are compared based on the three hadronization schemes. Our analysis shows that the process of hadronization causes major distortions of the partonic azimuthal harmonics for transverse momenta at least up to pT = 3GeV. In particular, they appear to be greatly reduced for pT < 1{\div}2GeV.

    Comments:
    13 pages, 7 figures, 2 tables
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1505.03734 [pdf]
    PLB(2015)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE