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Nuclear Theory·nucl-th

Monday·March 27, 2017

5 papers—3 primary·2 cross-listed

All5Primary3Cross-lists2
  1. 04

    [Submitted on 23 Mar 2017] (cross-list from hep-lat)

    Off-forward gluonic structure of vector mesons

    W. Detmold🇺🇸 · D. Pefkou🇺🇸 · P. E. Shanahan🇺🇸

    The spin-independent and transversity generalised form factors (GFFs) of the meson are studied using lattice QCD calculations with light quark masses corresponding to a pion mass MeV. One transversity and three spin-independent GFFs related to the lowest moments of leading-twist spin-independent and transversity gluon distributions are obtained at six non-zero values of the momentum transfer up to 1.2 GeV. These quantities are compared with the analogous spin-independent quark GFFs and the electromagnetic form factors determined on the same lattice ensemble. The results show quantitative distinction between the spatial distribution of transversely polarised gluons, unpolarised gluons, and quarks, and point the way towards further investigations of the gluon structure of nucleons and nuclei.

    Comments:
    Corrections to Eqs. (7), (8) and the unnumbered equation in Appendix B
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1703.08220 [pdf]
    PRD(2017)·17 citations
  2. 05

    [Submitted on 24 Mar 2017] (cross-list from hep-ph)

    Quark transverse spin-orbit correlations

    Amit Bhoonah (ETH Zürich)🇨🇭 · Cédric Lorcé (Ecole polytechnique, CPHT)🇫🇷

    We extend the study of quark spin-orbit correlations in the nucleon to the case of transverse polarization. At the leading-twist level, this completes the spin structure of the quark kinetic energy-momentum tensor. In particular, we revisit the transversity decomposition of angular momentum proposed a decade ago by Burkardt and introduce a new transverse correlation, namely between quark transversity and orbital angular momentum. We also provide for the first time the Wandzura-Wilczek expression for the second Mellin moment of twist-3 transversity generalized parton distributions, along with a new sum rule. Based on lattice calculation results, we conclude that the quark transverse spin-orbit correlation is negative for both up and down flavors, just like in the longitudinal case.

    Comments:
    7 pages, 1 table
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1703.08322 [pdf]
    PLB(2017)·22 citations

Affiliations

first authorsco-authorsvia INSPIRE