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Nuclear Theory·nucl-th

Wednesday·December 12, 2018

8 papers—5 primary·3 cross-listed

All8Primary5Cross-lists3
  1. 06

    [Submitted on 11 Dec 2018] (cross-list from hep-ph)

    Double parton scattering and the proton transverse structure at the LHC

    Matteo Rinaldi🇮🇹 · Federico Alberto Ceccopieri🇧🇪

    We consider double parton distribution functions (dPDFs), essential quantities in double parton scattering (DPS) studies, which encode novel non perturbative insight on the partonic proton structure. We develop the formalism to extract this information from dPDFs and present results by using constituent quark model calculations within the Light-Front approach, focusing on radiatively generated gluon dPDFs. Moreover, we generalize the relation between the mean transverse partonic distance between two active partons in a DPS process and the so called effective cross section to include partonic correlations and the so called 2v1 mechanism contribution. Finally we investigate the impact of relativistic effects on digluon distributions and study the structure of the corresponding longitudinal and transverse correlations.

    Comments:
    24 pages, 11 figures, 6 tables. Version accepted for publication in JHEP
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1812.04286 [pdf]
    JHEP(2019)·24 citations
  2. 07

    [Submitted on 11 Dec 2018] (cross-list from hep-ph)

    Geometrical scaling of prompt photons in heavy ion collisions

    Michal Praszalowicz🇵🇱

    We discuss geometrical scaling (GS) for the prompt (direct) photons produced in heavy ion collisions. To this end we first introduce the concept of GS and illustrate its emergence on the example of charged particles. Next, we analyse direct photon data from RHIC and from the LHC. We show that the data support the hypothesis of GS in terms of participant number related to different centrality classes. We also study GS at different energies, however a more detailed study will be possible only when data for at least three different energies from one experiment will be available and also when we use the data obtained from the collisions of large systems (Cu+Cu, Au+Au, Pb+Pb) and small systems (p+p, d+Au, p+Au).

    Comments:
    10 page, 7 figures, talk at the ISMD 2018 in Singapore
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1812.04524 [pdf]
    EPJ Web Conf.(2019)·5 citations
  3. 08

    [Submitted on 11 Dec 2018] (cross-list from hep-ph)

    Single-Transverse-Spin Asymmetries in Exclusive Photo-production of J/psi in Ultra-Peripheral Collisions in the Fixed-Target Mode at the LHC and in the Collider Mode at RHIC

    J.P. Lansberg🇫🇷 · L. Massacrier🇫🇷 · L. Szymanowski🇵🇱 · J. Wagner🇵🇱

    We investigate the potentialities offered by the study of J/psi exclusive photo-production in ultra-peripheral collisions at a fixed-target experiment using the proton and lead LHC beams (generically denoted as AFTER@LHC) on hydrogen targets and at RHIC in the collider mode. We compare the expected counting rates in both set-ups. Studying Single-Transverse-Spin Asymmetries (A_N) in such a process provides a direct path to the proton Generalised Parton Distribution (GPD) E_g(x,xi,t). We evaluate the expected precision on A_N for realistic conditions with the LHCb detector in pH(pol) and PbH(pol) collisions. We also discuss prospects with polarised deuterium and helium targets in the case of AFTER@LHC.

    Comments:
    9 pages, 14 figures, 2 tables, LaTeX uses elsarticle
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1812.04553 [pdf]
    PLB(2019)·15 citations

Affiliations

first authorsco-authorsvia INSPIRE