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Nuclear Theory·nucl-th

Tuesday·March 21, 2017

11 papers—8 primary·3 cross-listed

All11Primary8Cross-lists3
  1. 09

    [Submitted on 17 Mar 2017] (cross-list from hep-ph)

    Transverse Momentum Dependent Parton Distributions at Small-x

    Bo-Wen Xiao🇨🇳 · Feng Yuan🇺🇸 · Jian Zhou🇨🇳

    We study the transverse momentum dependent (TMD) parton distributions at small-x in a consistent framework that takes into account the TMD evolution and small-x evolution simultaneously. The small-x evolution effects are included by computing the TMDs at appropriate scales in terms of the dipole scattering amplitudes, which obey the relevant Balitsky-Kovchegov equation. Meanwhile, the TMD evolution is obtained by resumming the Collins-Soper type large logarithms emerged from the calculations in small-x formalism into Sudakov factors.

    Comments:
    23 pages, 9 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1703.06163 [pdf]
    NPB(2017)·80 citations
  2. 10

    [Submitted on 20 Mar 2017] (cross-list from hep-ph)

    Charmonium production in ultra-peripheral heavy ion collisions with two-photon processes

    Gong-Ming Yu🇨🇳 · Yue-Chao Yu🇨🇳 · Yun-De Li🇨🇳 · Jian-Song Wang🇨🇳

    We calculate the production of large-pTcharmonium and narrow resonance state (exotic charmonium) in proton-proton, proton-nucleus, and nucleus-nucleus collisions with the semi-coherent two-photon interactions at Relativistic Heavy Ion Collider (RHIC), Large Hadron Collider (LHC), and Future Circular Collider (FCC) energies. Using the large quasi-real photon fluxes, we present the \gamma\gamma->H differential cross section for charmonium and narrow resonance state production at large transverse momentum in ultra-peripheral heavy ion collisions. The numerical results demonstrate that the experimental study of ultra-peripheral col-lisions is feasible at RHIC, LHC, and FCC energies.

    Comments:
    11 pages, 2 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1703.06620 [pdf]
    NPB(2017)·16 citations
  3. 11

    [Submitted on 20 Mar 2017] (cross-list from hep-lat)

    Up, down, and strange nucleon axial form factors from lattice QCD

    Jeremy Green🇩🇪 · Nesreen Hasan🇩🇪 · Stefan Meinel🇺🇸 · Michael Engelhardt🇺🇸 · Stefan Krieg🇩🇪 · Jesse Laeuchli🇺🇸 · John Negele🇺🇸 · Kostas Orginos🇺🇸 · Andrew Pochinsky🇺🇸 · Sergey Syritsyn🇺🇸

    We report a calculation of the nucleon axial form factors and for all three light quark flavors in the range using lattice QCD. This work was done using a single ensemble with pion mass 317 MeV and made use of the hierarchical probing technique to efficiently evaluate the required disconnected loops. We perform nonperturbative renormalization of the axial current, including a nonperturbative treatment of the mixing between light and strange currents due to the singlet-nonsinglet difference caused by the axial anomaly. The form factor shapes are fit using the model-independent expansion. From , we determine the quark contributions to the nucleon spin and axial radii. By extrapolating the isovector , we obtain the induced pseudoscalar coupling relevant for ordinary muon capture and the pion-nucleon coupling constant. We find that the disconnected contributions to form factors are large, and give an interpretation based on the dominant influence of the pseudoscalar poles in these form factors.

    Comments:
    29 pages, 17 figures. v2: additional comparison with phenomenology and discussion of systematics; new appendix with fit parameters
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1703.06703 [pdf]
    PRD(2017)·113 citations

Affiliations

first authorsco-authorsvia INSPIRE