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Title: Measurement of the Shared Momentum Fraction z g using Jet Reconstruction in p + p and Au + Au Collisions with STAR

Abstract

One key difference in current energy loss models lies in the treatment of the Altarelli-Parisi, AP, splitting functions. It has been shown that the shared momentum fraction, henceforth called Jet Splitting Function z g as determined by the SoftDrop grooming process can be made a Sudakov-safe measurement of the symmetrized AP functions in p+p collisions. The STAR collaboration presents the first z g measurements at $$ \sqrt{s}$$NN = 200 GeV in p+p and Au+Au collisions, where in Au+Au we use a set of di-jets with hard cores reconstructed with a 2 GeV/c constituent cut. For a jet resolution parameter of R = 0.4, these di-jet pairs were found to be significantly imbalanced with respect to p+p, yet regained balance when all soft constituents were included. As a result, we find that within uncertainties there are no signs of a modified Jet Splitting Function on trigger or recoil sides of this di-jet selection.

Authors:
 [1]
  1. Wayne State Univ., Detroit, MI (United States)
Publication Date:
Research Org.:
Wayne State Univ., Detroit, MI (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1502368
Grant/Contract Number:  
[FG02-92ER40713]
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; Quark-gluon plasma; jets; SoftDrop; Shared Momentum Fraction

Citation Formats

Kauder, K. Measurement of the Shared Momentum Fraction zg using Jet Reconstruction in p + p and Au + Au Collisions with STAR. United States: N. p., 2017. Web. doi:10.1016/j.nuclphysa.2017.07.004.
Kauder, K. Measurement of the Shared Momentum Fraction zg using Jet Reconstruction in p + p and Au + Au Collisions with STAR. United States. doi:10.1016/j.nuclphysa.2017.07.004.
Kauder, K. Mon . "Measurement of the Shared Momentum Fraction zg using Jet Reconstruction in p + p and Au + Au Collisions with STAR". United States. doi:10.1016/j.nuclphysa.2017.07.004. https://www.osti.gov/servlets/purl/1502368.
@article{osti_1502368,
title = {Measurement of the Shared Momentum Fraction zg using Jet Reconstruction in p + p and Au + Au Collisions with STAR},
author = {Kauder, K.},
abstractNote = {One key difference in current energy loss models lies in the treatment of the Altarelli-Parisi, AP, splitting functions. It has been shown that the shared momentum fraction, henceforth called Jet Splitting Function zg as determined by the SoftDrop grooming process can be made a Sudakov-safe measurement of the symmetrized AP functions in p+p collisions. The STAR collaboration presents the first zg measurements at $ \sqrt{s}$NN = 200 GeV in p+p and Au+Au collisions, where in Au+Au we use a set of di-jets with hard cores reconstructed with a 2 GeV/c constituent cut. For a jet resolution parameter of R = 0.4, these di-jet pairs were found to be significantly imbalanced with respect to p+p, yet regained balance when all soft constituents were included. As a result, we find that within uncertainties there are no signs of a modified Jet Splitting Function on trigger or recoil sides of this di-jet selection.},
doi = {10.1016/j.nuclphysa.2017.07.004},
journal = {Nuclear Physics. A},
number = [C],
volume = [967],
place = {United States},
year = {2017},
month = {9}
}

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Figures / Tables:

Fig. 1. Fig. 1. : Trigger jets for p+p HT compared to detector level PYTHIA predictions in one examplemore » $p$$det\atop{T}$ bin at detector level. Error bars are statistical only.« less

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.