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Nuclear Theory·nucl-th

Monday·April 25, 2016

10 papers—7 primary·3 cross-listed

All10Primary7Cross-lists3
  1. 08

    [Submitted on 22 Apr 2016] (cross-list from hep-ph)

    Exploring universality of transversity in proton-proton collisions

    Marco Radici🇮🇹 · Alessandro M. Ricci🇮🇹 · Alessandro Bacchetta🇮🇹 · Asmita Mukherjee🇮🇳

    We consider the azimuthal correlations of charged hadron pairs with large total transverse momentum and small relative momentum, produced in proton-proton collisions with one transversely polarized proton. One of these correlations directly probes the chiral-odd transversity parton distribution in connection with a chiral-odd interference fragmentation function. We present predictions for this observable based on previous extractions of transversity (from charged pion pair production in semi-inclusive deep-inelastic scattering) and of the interference fragmentation function (from the production of back-to-back charged pion pairs in electron-positron annihilations). All analyses are performed in the framework of collinear factorization. We compare our predictions to the recent data on proton-proton collisions released by the STAR collaboration at RHIC, and we find them reasonably compatible. This comparison confirms for the first time the predicted role of transversity in proton-proton collisions and it allows to test its universality.

    Comments:
    5 pages, revtex4-1 with pdflatex, 4 figures in pdf format
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1604.06585 [pdf]
    PRD(2016)·41 citations
  2. 09

    [Submitted on 22 Apr 2016] (cross-list from hep-ph)

    The decays in QCD

    Maximilian Emmerich🇩🇪 · Nils Offen🇩🇪 · Andreas Schäfer🇩🇪

    We present an exploratory study of the -form factors and the semileptonic decay width within the framework of light-cone sum rules. We use two different methods and two different interpolating currents for the . As interpolating currents we choose an axial-vector like and a pseudoscalar like current. Our results show that the procedure of eliminating negative parity partners is not well suited for the case at hand and that the second approach using structures with highest powers of with an axial-vector like interpolating current gives the most reliable results. Our predictions are based on the models obtained in \cite{Anikin:2015ita,Braun:2014wpa}. The largest uncertainty comes from the uncertainty of the twist 4 parameters and we take the spread between the two models in \cite{Anikin:2015ita} as a measure for this. We get \begin{eqnarray} \Gamma(\Lambda_b\to N^*(1535) l \nu)&=&\left(0.0058^{+0.0010}_{-0.0009}\right)\cdot\left(\dfrac{V_{ub}}{3.5\cdot10^{-3}}\right)^2,\quad\mbox{LCSR(1)} \nonumber \Gamma(\Lambda_b\to N^*(1535) l \nu)&=&\left(0.00070^{+0.00012}_{-0.00011}\right)\cdot\left(\dfrac{V_{ub}}{3.5\cdot10^{-3}}\right)^2,\quad\mbox{LCSR(2)} \nonumber \Gamma(\Lambda_c\to N^*(1535) l \nu)&=&\left(0.0064^{+0.0012}_{-0.0011}\right)\cdot \left(\dfrac{V_{cd}}{0.225}\right)^2,\quad\mbox{LCSR(1)}\nonumber \Gamma(\Lambda_c\to N^*(1535) l \nu)&=&\left(0.00077^{+0.00016}_{-0.00014}\right)\cdot \left(\dfrac{V_{cd}}{0.225}\right)^2,\quad\mbox{LCSR(2)}\nonumber \end{eqnarray} as predictions for the respective decay widths, where LCSR(1) and LCSR(2) refer to the two different models of the distribution amplitudes of the . It is seen that even a rough measurement of these decays will greatly help to discriminate different models.

    Comments:
    15 pages, 6 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1604.06595 [pdf]
    J.Phys.G(2016)·8 citations
  3. 10

    [Submitted on 22 Apr 2016] (cross-list from hep-ph)

    Could the static properties of nuclei be deduced from the dynamics of a single quark?

    B P Kosyakov🇷🇺 · E Yu Popov🇷🇺 · M A Vronskii🇷🇺

    We show that the static properties of a nucleus could arise from a single quark moving in a mean field generated by all other constituents of this nucleus. The resulting model provides a way for determining the nuclear sizes characteristic of the liquid drop model, and reasonably accurate values of magnetic moments of different nuclei with the aid of two parameters and appearing in the Cornell potential intended for use in quarkonium physics.

    Comments:
    13 pages, 5 figures; v2: published version, the title is somewhat changed, several conceptual clarifications are added
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1604.06613 [pdf]
    EPJA(2017)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE