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Nuclear Theory·nucl-th

Thursday·August 29, 2019

8 papers—2 primary·6 cross-listed

All8Primary2Cross-lists6
  1. 03

    [Submitted on 27 Aug 2019] (cross-list from hep-ph)

    Gluonic Probe for the Short Range Correlation in Nucleus

    Ji Xu🇨🇳 · Feng Yuan🇺🇸

    We investigate the gluonic probe to the nucleon-nucleon short range correlation (SRC) in nucleus through heavy flavor production in deep inelastic scattering (DIS). The relevant EMC effects of structure function will provide a universality test of the SRCs which have been extensively studied in the quark-channel. These SRCs can also be studied through the sub-threshold production of heavy flavor in collisions at the intermediate energy electron-ion collider, including open Charm and () production.

    Comments:
    6 pages, 2 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1908.10413 [pdf]
    PLB(2020)·21 citations
  2. 04

    [Submitted on 27 Aug 2019] (cross-list from hep-ph)

    Cold quark matter with heavy quarks and the stability of charm stars

    José C. Jiménez🇧🇷 · Eduardo S. Fraga🇧🇷

    We study the effects of heavy quarks on the equation of state for cold and dense quark matter obtained from perturbative QCD, yielding observables parametrized only by the renormalization scale. We investigate the thermodynamics of charm quark matter under the constraints of equilibrium and electric charge neutrality in a region of densities where perturbative QCD is, in principle, much more reliable. We also analyze the stability of charm stars, which might be realized as a new branch of ultradense hybrid compact stars, and find that such quark stars are unstable under radial oscillations.

    Comments:
    8 pages, 6 figures; v2: figure added, references added, modifications to the text and figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1908.10415 [pdf]
    PRD(2020)·8 citations
  3. 05

    [Submitted on 27 Aug 2019] (cross-list from hep-lat)

    Parton Physics on a Quantum Computer

    Henry Lamm🇺🇸 · Scott Lawrence🇺🇸 · Yukari Yamauchi (for the NuQS Collaboration)🇺🇸

    Parton distribution functions and hadronic tensors may be computed on a universal quantum computer without many of the complexities that apply to Euclidean lattice calculations. We detail algorithms for computing parton distribution functions and the hadronic tensor in the Thirring model. Their generalization to QCD is discussed, with the conclusion that the parton distribution function is best obtained by fitting the hadronic tensor, rather than direct calculation. As a side effect of this method, we find that lepton-hadron cross sections may be computed relatively cheaply. Finally, we estimate the computational cost of performing such a calculation on a digital quantum computer, including the cost of state preparation, for physically relevant parameters.

    Comments:
    7 pg, 1 fig, v2 changed to match version accepted to PRR
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    1908.10439 [pdf]
    PRResearch(2020)·128 citations
  4. 06

    [Submitted on 28 Aug 2019] (cross-list from nucl-ex)

    Possible Formation of QGP-droplets in Proton-Proton Collisions at the CERN Large Hadron Collider

    Raghunath Sahoo🇮🇳

    Proton-proton (pp) collisions have been traditionally used as a baseline measurement in the search for a deconfined state of matter in heavy-ion collisions at ultrarelativistic energies. The unprecedented collision energies that are available at the Large Hadron Collider (LHC) at the European Laboratory for Nuclear Research (CERN) have illuminated new challenges in understanding the possible formation of droplets of this deconfined matter of partonic degrees of freedom in hadronic collisions, especially in high-multiplicity events. Enhancement of multi-strange particles compared to pions, degree of collectivity, comparable freeze-out temperature with heavy-ion collisions, observation of a long-range ridge-like structure for high-multiplicity events are some of the experimental observations in this direction. In this article, we discuss some of the experimental observables and outline new theoretical directions to understand the possibilities of exploring the formation of QGP-droplets in pp collisions at the LHC.

    Comments:
    6-pages, Featured invited article for beginners in the field, appeared in AAPPS Bulletin
    Subjects:
    Nuclear Experiment (nucl-ex); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1908.10566 [pdf]
    AAPPS Bull.(2019)·53 citations
  5. 07

    [Submitted on 28 Aug 2019] (cross-list from hep-ph)

    Interacting hadron resonance gas model in magnetic field and the fluctuations of conserved charges

    Guruprasad Kadam🇮🇳 · Somenath Pal🇮🇳 · Abhijit Bhattacharyya🇮🇳

    In this paper we discuss the interacting hadron resonance gas model in presence of a constant external magnetic field. The short range repulsive interaction between hadrons are accounted through van der Waals excluded volume correction to the ideal gas pressure. Here we take the sizes of hadrons as (pion radius) fm, (kaon radius) fm, (all other meson radii) fm and (baryon radii) fm. We analyse the effect of uniform background magnetic field on the thermodynamic properties of interacting hadron gas. We especially discuss the effect of interactions on the behaviour of magnetization of low temperature hadronic matter. The vacuum terms have been regularized using magnetic field independent regularization scheme. We find that the magnetization of hadronic matter is positive which implies that the low temperature hadronic matter is paramagnetic. We further find that the repulsive interactions have very negligible effect on the overall magnetization of the hadronic matter and the paramagnetic property of the hadronic phase remains unchanged. We have also investigated the effects of short range repulsive interactions as well as the magnetic field on the baryon and electric charge number susceptibilities of hadronic matter within the ambit of excluded volume hadron resonance gas model.

    Comments:
    Revised manuscript, 20 pages, 8 captioned figures, Accepted for publication in Journal of Physics G
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1908.10618 [pdf]
    J.Phys.G(2020)·28 citations
  6. 08

    [Submitted on 28 Aug 2019] (cross-list from hep-lat)

    Moments of nucleon generalized parton distributions from lattice QCD simulations at physical pion mass

    C. Alexandrou (Univ. of Cyprus & Cyprus Inst.)🇨🇾 · S. Bacchio (Cyprus Inst.)🇨🇾 · M. Constantinou (Temple Univ.)🇺🇸 · P. Dimopoulos (Rome Tor Vergata)🇮🇹 · J. Finkenrath (Cyprus Inst.)🇨🇾 · R. Frezzotti (Rome Tor Vergata)🇮🇹 · K. Hadjiyiannakou (Cyprus Inst.)🇨🇾 · K. Jansen (DESY-Zeuthen)🇩🇪 · B. Kostrzewa (Univ. of Bonn)🇩🇪 · G. Koutsou (Cyprus Inst.)🇨🇾 · C. Lauer (Temple Univ. & Argonne National Lab.)🇺🇸 · C. Urbach (Univ. of Bonn)🇩🇪

    We present results for the moments of nucleon isovector vector and axial generalised parton distribution functions computed within lattice QCD. Three ensembles of maximally twisted mass clover-improved fermions simulated with a physical value of the pion mass are analyzed. Two of these ensembles are generated using two degenerate light quarks. A third ensemble is used having, in addition to the light quarks, strange and charm quarks in the sea. A careful analysis of the convergence to the ground state is carried out that is shown to be essential for extracting the correct nucleon matrix elements. This allows a controlled determination of the unpolarised, helicity and tensor second Mellin moments. The vector and axial-vector generalised form factors are also computed as a function of the momentum transfer square up to about 1 GeV. The three ensembles allow us to check for unquenching effects and to assess lattice finite volume effects.

    Comments:
    Published version. Typos corrected, references and figures added. 22 pages, 17 figures
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1908.10706 [pdf]
    PRD(2020)·98 citations

Affiliations

first authorsco-authorsvia INSPIRE