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Nuclear Theory·nucl-th

Friday·April 14, 2017

13 papers—9 primary·4 cross-listed

All13Primary9Cross-lists4
  1. 10

    [Submitted on 12 Apr 2017] (cross-list from hep-ph)

    Quenching of vector boson-tagged jets at the LHC

    Hongxi Xing🇺🇸

    Electroweak boson-tagged jet measurements provide a promising experimental channel to accurately study the physics of jet production and propagation in dense QCD medium. In this talk, we present theoretical predictions for the nuclear-induced attenuation of the differential cross section for isolated photon-tagged and -tagged jet production in heavy ion collisions, and provide theoretical interpretations to the recent LHC data. We demonstrate quantitatively the significance of collisional and radiative energy losses, as revealed in the strong momentum asymmetry and nuclear modification in central lead-lead reactions.

    Comments:
    4 pages, 4 figures, presented at Quark Matter 2017 conference
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1704.03930 [pdf]
    NPA(2017)·0 citations
  2. 11

    [Submitted on 13 Apr 2017] (cross-list from hep-ph)

    Status of nuclear PDFs after the first LHC p-Pb run

    Hannu Paukkunen🇫🇮

    In this talk, I overview the recent progress on the global analysis of nuclear parton distribution functions (nuclear PDFs). After first introducing the contemporary fits, the analysis procedures are quickly recalled and the ambiguities in the use of experimental data outlined. Various nuclear-PDF parametrizations are compared and the main differences explained. The effects of nuclear PDFs in the LHC p-Pb hard-process observables are discussed and some future prospects sketched.

    Comments:
    A transcript of the plenary talk delivered in the Quark Matter 2017 conference
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1704.04036 [pdf]
    NPA(2017)·18 citations
  3. 12

    [Submitted on 13 Apr 2017] (cross-list from hep-ph)

    Latest results from the EbyE NLO EKRT model

    Kari J. Eskola🇫🇮 · Harri Niemi🇩🇪 · Risto Paatelainen🇫🇮 · Kimmo Tuominen🇫🇮

    We review the results from the event-by-event next-to-leading order perturbative QCD + saturation + viscous hydrodynamics (EbyE NLO EKRT) model. With a simultaneous analysis of LHC and RHIC bulk observables we systematically constrain the QCD matter shear viscosity-to-entropy ratio eta/s(T), and test the initial state computation. In particular, we study the centrality dependences of hadronic multiplicities, pT spectra, flow coefficients, relative elliptic flow fluctuations, and various flow-correlations in 2.76 and 5.02 TeV Pb+Pb collisions at the LHC and 200 GeV Au+Au collisions at RHIC. Overall, our results match remarkably well with the LHC and RHIC measurements, and predictions for the 5.02 TeV LHC run are in an excellent agreement with the data. We probe the applicability of hydrodynamics via the average Knudsen numbers in the space-time evolution of the system and viscous corrections on the freeze-out surface.

    Comments:
    5 pages, 12 figure panels, talk by K.J.E. in Quark Matter 2017, the XXVI International Conference on Ultrarelativistic Heavy-Ion Collisions, February 6-11, 2017, to appear in the proceedings
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1704.04060 [pdf]
    NPA(2017)·13 citations
  4. 13

    [Submitted on 13 Apr 2017] (cross-list from hep-ph)

    Bound state equation for the Nakanishi weight function

    J. Carbonell🇫🇷 · T. Frederico🇧🇷 · V.A. Karmanov🇷🇺

    The bound state Bethe-Salpeter amplitude was expressed by Nakanishi using a two-dimensional integral representation, in terms of a smooth weight function , which carries the detailed dynamical information. A similar, but one-dimensional, integral representation can be obtained for the Light-Front wave function in terms of the same weight function . By using the generalized Stieltjes transform, we first obtain in terms of the Light-Front wave function in the complex plane of its arguments. Next, a new integral equation for the Nakanishi weight function is derived for a bound state case. It has the standard form , where is a two-dimensional integral operator. We give the prescription for obtaining the kernel starting with the kernel of the Bethe-Salpeter equation. The derivation is valid for any kernel given by an irreducible Feynman amplitude.

    Comments:
    12 pages, 1 figure, to appear in Phys. Lett. B
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1704.04160 [pdf]
    PLB(2017)·23 citations

Affiliations

first authorsco-authorsvia INSPIRE