Content area

Abstract

We test the hypothesis that configurations of a proton with a large-\(x\) parton, \(x_p \gtrsim 0.1\), have a smaller than average size. The QCD \(Q^2\) evolution equations suggest that these small configurations also have a significantly smaller interaction strength, which has observable consequences in collisions with nuclei. We perform a global analysis of jet production data in proton- and deuteron-nucleus collisions at RHIC and the LHC. Using a model which takes a distribution of interaction strengths into account, we quantitatively extract the \(x_p\)-dependence of the average interaction strength, \(\sigma(x_p)\), over a wide kinematic range. By comparing the RHIC and LHC results, our analysis finds that the interaction strength for small configurations, while suppressed, grows faster with collision energy than does that for average configurations. We check that this energy dependence is consistent with the results of a method which, given \(\sigma(x_p)\) at one energy, can be used to quantitatively predict that at another. This finding further suggests that at even lower energies, nucleons with a large-\(x_p\) parton should interact much more weakly than those in an average configuration, a phenomenon in line with explanations of the EMC effect for large-\(x_p\) quarks in nuclei based on color screening.

Details

1009240
Title
Global analysis of color fluctuation effects in proton- and deuteron-nucleus collisions at RHIC and the LHC
Publication title
arXiv.org; Ithaca
Publication year
2018
Publication date
Sep 18, 2018
Section
High Energy Physics - Experiment; High Energy Physics - Phenomenology; Nuclear Experiment
Publisher
Cornell University Library, arXiv.org
Source
arXiv.org
Place of publication
Ithaca
Country of publication
United States
University/institution
Cornell University Library arXiv.org
e-ISSN
2331-8422
Source type
Working Paper
Language of publication
English
Document type
Working Paper
Publication history
 
 
Online publication date
2018-10-17
Milestone dates
2017-09-14 (Submission v1); 2018-09-18 (Submission v2)
Publication history
 
 
   First posting date
17 Oct 2018
ProQuest document ID
2076678588
Document URL
https://www.proquest.com/publiccontent/working-papers/global-analysis-color-fluctuation-effects-proton/docview/2076678588/sem-2?accountid=40258
Full text outside of ProQuest
Copyright
© 2018. This work is published under http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.
Last updated
2020-03-06
Database
Publicly Available Content Database