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Xinnian Wang - One of the best experts on this subject based on the ideXlab platform.

  • parton energy loss and the generalized jet transport coefficient
    Physical Review D, 2019
    Co-Authors: Y Zhang, Xinnian Wang
    Abstract:

    We revisit radiative parton energy loss in deeply inelastic scattering (DIS) off a large nucleus within the perturbative QCD approach. We calculate the Gluon radiation spectra induced by double parton scattering in DIS without collinear expansion in the transverse momentum of initial Gluons as in the original high-twist approach. The final radiative Gluon spectrum can be expressed in terms of the convolution of hard partonic parts and unintegrated or transverse momentum dependent (TMD) quark-Gluon correlations. The TMD quark-Gluon correlation can be factorized approximately as a product of initial quark distribution and TMD Gluon distribution which can be used to define the generalized or TMD jet transport coefficient. Under the static scattering center and soft radiative Gluon approximation, we recover the result by Gylassy-Levai-Vitev in the first order of the opacity expansion. The difference as a result of the soft radiative Gluon approximation is investigated numerically under the static scattering center approximation.

Jean-françois Colonna - One of the best experts on this subject based on the ideXlab platform.

Şener Özönder - One of the best experts on this subject based on the ideXlab platform.

  • Long range azimuthal correlations of multiple Gluons in Gluon saturation limit
    Physical Review D, 2016
    Co-Authors: Şener Özönder
    Abstract:

    We calculate the inclusive Gluon correlation function for arbitrary number of Gluons with full rapidity and transverse momentum dependence for the initial glasma state of the p-p, p-A, and A-A collisions. The formula we derive via superdiagrams generates cumulants for any number of Gluons. Higher order cumulants contain information on correlations between multiple Gluons, and they are necessary for calculations of higher dimensional ridges as well as flow coefficients from multiparticle correlations.

  • Triple-Gluon and quadruple-Gluon azimuthal correlations from glasma and higher-dimensional ridges
    Physical Review D, 2015
    Co-Authors: Şener Özönder
    Abstract:

    We calculate the triple- and quadruple-Gluon inclusive distributions with arbitrary rapidity and azimuthal angle dependences in the Gluon saturation regime by using glasma diagrams. Also, we predict higher-dimensional ridges in triple- and quadruple-hadron correlations for p-p and p-Pb collisions at LHC, which have yet to be measured. In p-p and p-Pb collisions at the top LHC energies, Gluon saturation is expected to occur since smaller Bjorken-$x$ values are being probed. Glasma diagrams, which are enhanced at small-$x$, include the Gluon saturation effects, and they are used for calculating the long-range rapidity correlations ("ridges") and $v_n$ moments of the azimuthal distribution of detected hadrons. The glasma description reproduces the systematics of the data on both p-p and p-Pb ridges. As an alternative, relativistic hydrodynamics has also been applied to these small systems quite successfully. With the triple- and quadruple-Gluon azimuthal correlations, this work aims to set the stage by going beyond the double-Gluon azimuthal correlations in order to settle unambiguously the origin of "collectivity" in p-p and p-Pb collisions. We derive the triple- and quadruple-Gluon azimuthal correlation functions in terms of unintegrated Gluon distributions at arbitrary rapidities and azimuthal angles of the produced Gluons. Then, unintegrated Gluon distributions from the running coupling Balitsky-Kovchegov evolution equation are used to calculate the triple- and quadruple-Gluon correlations for various parameters of Gluon momenta, initial scale for small-$x$ evolution and beam energy.

Y Zhang - One of the best experts on this subject based on the ideXlab platform.

  • parton energy loss and the generalized jet transport coefficient
    Physical Review D, 2019
    Co-Authors: Y Zhang, Xinnian Wang
    Abstract:

    We revisit radiative parton energy loss in deeply inelastic scattering (DIS) off a large nucleus within the perturbative QCD approach. We calculate the Gluon radiation spectra induced by double parton scattering in DIS without collinear expansion in the transverse momentum of initial Gluons as in the original high-twist approach. The final radiative Gluon spectrum can be expressed in terms of the convolution of hard partonic parts and unintegrated or transverse momentum dependent (TMD) quark-Gluon correlations. The TMD quark-Gluon correlation can be factorized approximately as a product of initial quark distribution and TMD Gluon distribution which can be used to define the generalized or TMD jet transport coefficient. Under the static scattering center and soft radiative Gluon approximation, we recover the result by Gylassy-Levai-Vitev in the first order of the opacity expansion. The difference as a result of the soft radiative Gluon approximation is investigated numerically under the static scattering center approximation.

Dirk H Rischke - One of the best experts on this subject based on the ideXlab platform.

  • debye screening and the meissner effect in a two flavor color superconductor
    Physical Review D, 2000
    Co-Authors: Dirk H Rischke
    Abstract:

    I compute the Gluon self-energy in a color superconductor with two flavors of massless quarks, where condensation of Cooper pairs breaks SU(3){sub c} to SU(2){sub c}. At zero temperature, there is neither Debye screening nor a Meissner effect for the three Gluons of the unbroken SU(2){sub c} subgroup. The remaining five Gluons attain an electric as well as a magnetic mass. For temperatures approaching the critical temperature for the onset of color superconductivity, or for Gluon momenta much larger than the color-superconducting gap, the self-energy assumes the form given by the standard hard-dense loop approximation. The Gluon self-energy determines the coefficient of the kinetic term in the effective low-energy theory for the condensate fields. (c) 2000 The American Physical Society.

  • debye screening and the meissner effect in a three flavor color superconductor
    Physical Review D, 2000
    Co-Authors: Dirk H Rischke
    Abstract:

    I compute the Gluon self-energy in a color superconductor with three flavors of massless quarks, where condensation of Cooper pairs breaks the color and flavor SU(3){sub c}xU(3){sub V}xU(3){sub A} symmetry of QCD to the diagonal subgroup SU(3){sub c+V}. At zero temperature, all eight electric Gluons obtain a Debye screening mass, and all eight magnetic Gluons a Meissner mass. The Debye as well as the Meissner masses are found to be equal for the different Gluon colors. These masses determine the coefficients of the kinetic terms in the effective theory for the low-energy degrees of freedom. Their values agree with those obtained by Son and Stephanov. (c) 2000 The American Physical Society.

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