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Nuclear Theory·nucl-th

Wednesday·October 26, 2016

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 05

    [Submitted on 25 Oct 2016] (cross-list from hep-lat)

    In-medium dispersion relations of charmonia studied by maximum entropy method

    Atsuro Ikeda🇯🇵 · Masayuki Asakawa🇯🇵 · Masakiyo Kitazawa🇯🇵

    We study in-medium spectral properties of charmonia in the vector and pseudoscalar channels at nonzero momenta on quenched lattices, especially focusing on their dispersion relation and weight of the peak. We measure the lattice Euclidean correlation functions with nonzero momenta on the anisotropic quenched lattices and study the spectral functions with the maximum entropy method. The dispersion relations of charmonia and the momentum dependence of the weight of the peak are analyzed with the maximum entropy method together with the errors estimated probabilistically in this method. We find significant increase of the masses of charmonia in medium. It is also found that the functional form of the charmonium dispersion relations is not changed from that in the vacuum within the error even at for all the channels we analyzed.

    Comments:
    11 pages, 14 figures
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1610.07787 [pdf]
    PRD(2017)·21 citations
  2. 06

    [Submitted on 25 Oct 2016] (cross-list from hep-lat)

    Equation of State for SU(3) Gauge Theory via the Energy-Momentum Tensor under Gradient Flow

    Masakiyo Kitazawa🇯🇵 · Takumi Iritani🇯🇵 · Masayuki Asakawa🇯🇵 · Tetsuo Hatsuda🇯🇵 · Hiroshi Suzuki🇯🇵

    The energy density and the pressure of SU(3) gauge theory at finite temperature are studied by direct lattice measurements of the renormalized energy-momentum tensor obtained by the gradient flow. Numerical analyses are carried out with -- corresponding to the lattice spacing --. The spatial (temporal) sizes are chosen to be , , (, , , , ) with the aspect ratio, . Double extrapolation, (the continuum limit) followed by (the zero flow-time limit), is taken using the numerical data. Above the critical temperature, the thermodynamic quantities are obtained with a few percent precision including statistical and systematic errors. The results are in good agreement with previous high-precision data obtained by using the integral method.

    Comments:
    12pages, many figures
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1610.07810 [pdf]
    PRD(2016)·101 citations
  3. 07

    [Submitted on 25 Oct 2016] (cross-list from hep-ph)

    Analytical On-shell Calculation of Higher Order Scattering: Massive Particles

    Barry R. Holstein🇺🇸

    We demonstrate that the use of on-shell methods, involving calculation of the discontinuity across the t-channel cut associated with the exchange of a pair of massless particles, can be used to evaluate loop contributions to both the electromagnetic and gravitational scattering of massive systems. In the gravitational case, the use of factorization permits a straightforward and algebraic calculation of higher order scattering results, which were obtained previously by much more arduous Feynman diagram techniques.

    Comments:
    36 pp., 5 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1610.07957 [pdf]
    9 citations

Affiliations

first authorsco-authorsvia INSPIRE