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

Abstract

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.

Authors:

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)

Publication Date:: 2017-09-25

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

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1502361

Grant/Contract Number:: SC0013460

Resource Type:: Accepted Manuscript

Journal Name:: Nuclear Physics. A

Additional Journal Information:: Journal Volume: 967; Journal Issue: C; Journal ID: ISSN 0375-9474

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Transverse momentum broadening; Scale evolution of ˆq; Quark-gluon plasma PDF; Factorization

Citation Formats


                    Kumar, Amit, Bianchi, Evan, Elledge, Jacob, Majumder, Abhijit, Qin, Guang -You, and Shen, Chun. Solving the qˆ puzzle with x and scale dependence.  United States: N. p., 2017. 
Web.  doi:10.1016/j.nuclphysa.2017.05.015.

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                    Kumar, Amit, Bianchi, Evan, Elledge, Jacob, Majumder, Abhijit, Qin, Guang -You, & Shen, Chun. Solving the qˆ puzzle with x and scale dependence.  United States.  https://doi.org/10.1016/j.nuclphysa.2017.05.015

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                    Kumar, Amit, Bianchi, Evan, Elledge, Jacob, Majumder, Abhijit, Qin, Guang -You, and Shen, Chun. Mon .  
"Solving the qˆ puzzle with x and scale dependence".  United States.  https://doi.org/10.1016/j.nuclphysa.2017.05.015.  https://www.osti.gov/servlets/purl/1502361.

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@article{osti_1502361,

  title        = {Solving the qˆ puzzle with x and scale dependence},

  author       = {Kumar, Amit and Bianchi, Evan and Elledge, Jacob and Majumder, Abhijit and Qin, Guang -You and Shen, Chun},

  abstractNote = {Here we present here a possible resolution of the jet quenching parameter qˆ puzzle by exploring the momentum fraction x and scale Q2 dependence of qˆ, 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 qˆ 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 qˆ at the same temperature in RHIC collisions compared to LHC collisions.},

  doi          = {10.1016/j.nuclphysa.2017.05.015},

  journal      = {Nuclear Physics. A},

  number       = C,

  volume       = 967,

  place        = {United States},

  year         = {2017},

  month        = {9}

}

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Journal Article:

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https://doi.org/10.1016/j.nuclphysa.2017.05.015

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Figures / Tables:

Fig. 1: Evaluating q̂. (a) Jet propagating through a nucleus interact via exchange of Glauber gluon emitted from a parton inside nucleon B. (b) DGLAP evolution of PDF. (c) Scale evolution of q̂ in rest frame of nucleon B for the process shown in figure 1(a) and PDF (figure 1(b))more »

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