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Nuclear Theory·nucl-th

Thursday·May 7, 2015

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 05

    [Submitted on 5 May 2015] (cross-list from hep-ph)

    Model of the N-Quark Potential in SU(N) Gauge Theory using Gauge-String Duality

    Oleg Andreev🇷🇺

    We use gauge-string duality to model the -quark potential in pure Yang-Mills theories. For , the result agrees remarkably well with lattice simulations. The model smoothly interpolates between almost the -law at small distances and the Y-law at large distances.

    Comments:
    5 pages, 4 figures; v2: improved discussion, references added; v3: presentation improved
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1505.01067 [pdf]
    PLB(2016)·23 citations
  2. 06

    [Submitted on 5 May 2015] (cross-list from hep-ph)

    Calculating TMDs of a Large Nucleus: Quasi-Classical Approximation and Quantum Evolution

    Yuri V. Kovchegov🇺🇸 · Matthew D. Sievert🇺🇸

    We set up a formalism for calculating transverse-momentum-dependent parton distribution functions (TMDs) using the tools of saturation physics. By generalizing the quasi-classical Glauber-Gribov-Mueller/McLerran-Venugopalan approximation to allow for the possibility of spin-orbit coupling, we show how any TMD can be calculated in the saturation framework. This can also be applied to the TMDs of a proton by modeling it as a large "nucleus." To illustrate our technique, we calculate the quark TMDs of an unpolarized nucleus at large-x: the unpolarized quark distribution and the quark Boer-Mulders distribution. We observe that spin-orbit coupling leads to mixing between different TMDs of the nucleus and of the nucleons. We then consider the evolution of TMDs: at large-x, in the double-logarithmic approximation, we obtain the Sudakov form factor. At small-x the evolution of unpolarized-target quark TMDs is governed by BK/JIMWLK evolution, while the small-x evolution of polarized-target quark TMDs appears to be dominated by the QCD Reggeon.

    Comments:
    56 pages, 14 figures; v2: typos corrected, references added; v3: more typos corrected, title slightly modified
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1505.01176 [pdf]
    NPB(2016)·61 citations
  3. 07

    [Submitted on 5 May 2015] (cross-list from hep-ph)

    Thermalization of Quark-Gluon Plasma in Magnetic Field at Strong Coupling

    Kiminad A. Mamo🇺🇸 · Ho-Ung Yee🇺🇸

    We study thermalization of strongly coupled gauge theory plasma in the presence of magnetic field using the AdS/CFT correspondence. We utilize the falling energy-shell model as a holographic description of gauge theory plasma undergoing thermalization, and find the effect of magnetic field on thermalization time in various space-time dimensions. Our results demonstrate that magnetic field universally hastens thermalization of strongly coupled gauge theory plasma.

    Comments:
    10 pages, 4 figures; references added, published in PRD
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1505.01183 [pdf]
    PRD(2015)·14 citations
  4. 08

    [Submitted on 16 Apr 2015] (cross-list from hep-ph)

    Excitation function of elastic scattering from a unitarily extended Bialas-Bzdak model

    F. Nemes🇨🇭 · T. Csörgő🇭🇺 · M. Csanád🇭🇺

    The Bialas-Bzdak model of elastic proton-proton scattering assumes a purely imaginary forward scattering amplitude, which consequently vanishes at the diffractive minima. We extended the model to arbitrarily large real parts in a way that constraints from unitarity are satisfied. The resulting model is able to describe elastic scattering not only at the lower ISR energies but also at 7~TeV in a statistically acceptable manner, both in the diffractive cone and in the region of the first diffractive minimum. The total cross-section as well as the differential cross-section of elastic proton-proton scattering is predicted for the future LHC energies of 13, 14, 15~TeV and also to 28~TeV. A non-trivial, significantly non-exponential feature of the differential cross-section of elastic proton-proton scattering is analyzed and the excitation function of the non-exponential behavior is predicted. The excitation function of the shadow profiles is discussed and related to saturation at small impact parameters.

    Comments:
    arXiv admin note: substantial text overlap with arXiv:1412.0813
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1505.01415 [pdf]
    Int.J.Mod.Phys.A(2015)·33 citations

Affiliations

first authorsco-authorsvia INSPIRE