Solving the qˆ puzzle with x and scale dependence

Kumar, Amit; Bianchi, Evan; Elledge, Jacob; Majumder, Abhijit; Qin, Guang -You; Shen, Chun

doi:10.1016/j.nuclphysa.2017.05.015

Title: Solving the $\hat{q}$ puzzle with x and scale dependence

Journal Article · Mon Sep 25 00:00:00 EDT 2017 · Nuclear Physics. A

DOI:https://doi.org/10.1016/j.nuclphysa.2017.05.015· OSTI ID:1502361

Kumar, Amit ^[1]; Bianchi, Evan ^[1]; Elledge, Jacob ^[2]; Majumder, Abhijit ^[1]; Qin, Guang -You ^[3]; Shen, Chun ^[4]

Wayne State Univ., Detroit, MI (United States)
Arizona State Univ., Tempe, AZ (United States)
China Normal Univ., Wuhan (China); Wayne State Univ., Detroit, MI (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Here we present here a possible resolution of the jet quenching parameter $\hat{q}$ puzzle by exploring the momentum fraction x and scale Q² dependence of $\hat{q}$ , in addition to temperature dependence. We explore the momentum broadening of the jet due to Glauber gluon exchange with the quark-gluon plasma (QGP). This has led us to define the momentum fraction x for the partons in the QGP. We also show here, for the first time, possible forms of the parton distribution function (PDF) of the QGP. The QGP-PDF as input in $\hat{q}$ has been used to fit the PHENIX and CMS data simultaneously. We observe that the scale evolution of the QGP-PDF and the energy of the jet are the missing ingredients responsible for the enhancement of $\hat{q}$ at the same temperature in RHIC collisions compared to LHC collisions.

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Research Organization:: Wayne State Univ., Detroit, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0013460

OSTI ID:: 1502361

Journal Information:: Nuclear Physics. A, Vol. 967, Issue C; ISSN 0375-9474

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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References (6)

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