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Nuclear Theory·nucl-th

Monday·June 15, 2020

7 papers—4 primary·3 cross-listed

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  1. 05

    [Submitted on 11 Jun 2020] (cross-list from hep-ph)

    QCD2019 Workshop Summary

    S.J. Brodsky🇺🇸 · V.D. Burkert🇺🇸 · D.S. Carman🇺🇸 · J.P. Chen🇺🇸 · Z.-F. Cui🇨🇳 · M. Döring🇺🇸 · H.G. Dosch🇩🇪 · J.P. Draayer🇺🇸 · L. Elouadrhiri🇺🇸 · D.I. Glazier🇬🇧 · A.N. Hiller Blin🇺🇸 · T. Horn🇺🇸 and 17 other authors

    The topical workshop {\it Strong QCD from Hadron Structure Experiments} took place at Jefferson Lab from Nov. 6-9, 2019. Impressive progress in relating hadron structure observables to the strong QCD mechanisms has been achieved from the {\it ab initio} QCD description of hadron structure in a diverse array of methods in order to expose emergent phenomena via quasi-particle formation. The wealth of experimental data and the advances in hadron structure theory make it possible to gain insight into strong interaction dynamics in the regime of large quark-gluon coupling (the strong QCD regime), which will address the most challenging problems of the Standard Model on the nature of the dominant part of hadron mass, quark-gluon confinement, and the emergence of the ground and excited state hadrons, as well as atomic nuclei, from QCD. This workshop aimed to develop plans and to facilitate the future synergistic efforts between experimentalists, phenomenologists, and theorists working on studies of hadron spectroscopy and structure with the goal to connect the properties of hadrons and atomic nuclei available from data to the strong QCD dynamics underlying their emergence from QCD. These results pave the way for a future breakthrough extension in the studies of QCD with an Electron-Ion Collider in the U.S.

    Comments:
    Summary and outlook of the "Strong QCD from Hadron Structure Experiment" topical Workshop at Jefferson Lab, November 4-8, 2019, Newport News, VA, USA, 65 pages, 57 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2006.06802 [pdf]
    IJMPE(2020)·76 citations
  2. 06

    [Submitted on 12 Jun 2020] (cross-list from hep-ph)

    Constraining gluon density of pions at large by pion-induced production

    Wen-Chen Chang🇹🇼 · Jen-Chieh Peng🇺🇸 · Stephane Platchkov🇫🇷 · Takahiro Sawada🇯🇵

    The gluon distributions of the pion obtained from various global fits exhibit large variations among them. Within the framework of the color evaporation model, we show that the existing pion-induced production data, usually not included in the global fits, can impose useful additional constraints on the pion parton distribution functions (PDFs). In particular, these data can probe the pion's gluon densities at large . Existing pion-induced data covering a broad range of beam momenta are compared with next-to-leading-order QCD calculations using various sets of pion PDFs. It is found that data measured at forward rapidity and at sufficiently high beam momentum are sensitive to the large- gluon distribution of pions. The current data favor the Sutton-Martin-Roberts-Stirling and Gluck-Reya-Vogt pion PDFs, containing significant gluon content at large .

    Comments:
    33 pages, 12 figures and 4 tables. Published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2006.06947 [pdf]
    PRD(2020)·39 citations
  3. 07

    [Submitted on 12 Jun 2020] (cross-list from hep-ph)

    Acoplanarity of QED pairs accompanied by nuclear dissociation in ultra-peripheral heavy ion collisions

    James Daniel Brandenburg🇨🇳 · Wei Li🇺🇸 · Lijuan Ruan🇺🇸 · Zebo Tang🇨🇳 · Zhangbu Xu🇺🇸 · Shuai Yang🇺🇸 · Wangmei Zha🇨🇳

    This paper investigates the transverse momentum broadening effect for electromagnetic production of dileptons in ultra-peripheral heavy ion collisions accompanied by nuclear dissociation. The electromagnetic dissociation probability of nuclei for different neutron multiplicities is estimated, which could serve as a centrality definition (i.e. impact parameter estimate) in ultra-peripheral collisions. In the framework of lowest-order QED, the acoplanarity of dilepton pairs is calculated for different neutron emission scenarios in ultra-peripheral collisions, indicating significant impact-parameter dependence. The verification of impact-parameter dependence is crucially important to understand the broadening effect observed in hadronic heavy-ion collisions.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2006.07365 [pdf]
    23 citations

Affiliations

first authorsco-authorsvia INSPIRE