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Nuclear Theory·nucl-th

Monday·August 31, 2020

4 papers—1 primary·3 cross-listed

All4Primary1Cross-lists3
  1. 02

    [Submitted on 27 Aug 2020] (cross-list from hep-lat)

    Electrical conductivity of the quark-gluon plasma: perspective from lattice QCD

    Gert Aarts🇬🇧 · Aleksandr Nikolaev🇬🇧

    A discussion on the electrical conductivity of the quark-gluon plasma as determined by lattice QCD is given. After a reminder of basic definitions and expectations, various methods for spectral reconstruction are reviewed, including the use of Ansätze and sum rules, the Maximum Entropy and Backus-Gilbert methods, and Tikhonov regularisation. A comprehensive overview of lattice QCD results obtained so far is given, including a comparison of the different lattice formulations. A noticeable consistency for the conductivities obtained is seen, in spite of the differences in the lattice setups and spectral reconstruction methods. It is found that in the case of quenched QCD little temperature dependence of is seen in the temperature range investigated, while for QCD with dynamical quarks a reduction of in the vicinity of the thermal crossover is observed, compared to its value in the QGP. Several open questions are posed at the end.

    Comments:
    13 pages, 3 figures, invited contribution to the EPJA topical issue "Theory of hot matter and relativistic heavy-ion collisions (THOR)"
    Subjects:
    High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    2008.12326 [pdf]
    EPJA(2021)·51 citations
  2. 03

    [Submitted on 28 Aug 2020] (cross-list from hep-ph)

    Nucleon Tomography and Generalized Parton Distribution at Physical Pion Mass from Lattice QCD

    Huey-Wen Lin🇺🇸

    We present the first lattice calculation of the nucleon isovector unpolarized generalized parton distribution (GPD) at the physical pion mass using a lattice ensemble with 2+1+1 flavors of highly improved staggered quarks (HISQ) generated by MILC Collaboration, with lattice spacing ~fm and volume . We use momentum-smeared sources to improve the signal at nucleon boost momentum GeV, and report results at nonzero momentum transfers in . Nonperturbative renormalization in RI/MOM scheme is used to obtain the quasi-distribution before matching to the lightcone GPDs. The three-dimensional distributions and at are presented, along with the three-dimensional nucleon tomography and impact-parameter--dependent distribution for selected Bjorken at GeV in scheme.

    Comments:
    Typos fixed. Removed data using twisted-boundary conditions
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    2008.12474 [pdf]
    PRL(2021)·113 citations
  3. 04

    [Submitted on 28 Aug 2020] (cross-list from hep-ph)

    An analysis of transverse momentum spectra of various jets produced in high energy collisions

    Yang-Ming Tai🇨🇳 · Pei-Pin Yang🇨🇳 · Fu-Hu Liu🇨🇳

    With the framework of the multi-source thermal model, we analyze the experimental transverse momentum spectra of various jets produced in different collisions at high energies. Two energy sources, a projectile participant quark and a target participant quark, are considered. Each energy source (each participant quark) is assumed to contribute to the transverse momentum distribution to be the TP-like function, i.e. a revised Tsallis--Pareto-type function. The contribution of the two participant quarks to the transverse momentum distribution is then the convolution of two TP-like functions. The model distribution can be used to fit the experimental spectra measured by different collaborations. The related parameters such as the entropy index-related, effective temperature, and revised index are then obtained. The trends of these parameters are useful to understand the characteristic of high energy collisions.

    Comments:
    18 pages, 11 figures. Advances in High Energy Physics, accepted
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2008.12554 [pdf]
    Adv.High Energy Phys.(2021)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE