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Title: Global analysis of color fluctuation effects in proton– and deuteron–nucleus collisions at RHIC and the LHC

Abstract

We test the hypothesis that configurations of a proton with a large-x parton, xp≳0.1, have a smaller than average size. The QCD Q2 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 xp-dependence of the average interaction strength, σ(xp), 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 σ(xp) 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-xp parton should interact much more weakly than those in an average configuration, a phenomenon in line with explanations of the EMC effect for large-xp quarks in nuclei based on color screening.

Authors:
; ; ;
Publication Date:
Research Org.:
Pennsylvania State Univ., University Park, PA (United States); Univ. of Colorado, Boulder, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1477134
Alternate Identifier(s):
OSTI ID: 1610240; OSTI ID: 1671529
Grant/Contract Number:  
FG02-93ER40771; SC0018117
Resource Type:
Published Article
Journal Name:
Physical Review. D.
Additional Journal Information:
Journal Name: Physical Review. D. Journal Volume: 98 Journal Issue: 7; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Astronomy & astrophysics; physics; hard scattering; quantum chromodynamics; quark & gluon jets

Citation Formats

Alvioli, M., Frankfurt, L., Perepelitsa, D. V., and Strikman, M. Global analysis of color fluctuation effects in proton– and deuteron–nucleus collisions at RHIC and the LHC. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.98.071502.
Alvioli, M., Frankfurt, L., Perepelitsa, D. V., & Strikman, M. Global analysis of color fluctuation effects in proton– and deuteron–nucleus collisions at RHIC and the LHC. United States. https://doi.org/10.1103/PhysRevD.98.071502
Alvioli, M., Frankfurt, L., Perepelitsa, D. V., and Strikman, M. Thu . "Global analysis of color fluctuation effects in proton– and deuteron–nucleus collisions at RHIC and the LHC". United States. https://doi.org/10.1103/PhysRevD.98.071502.
@article{osti_1477134,
title = {Global analysis of color fluctuation effects in proton– and deuteron–nucleus collisions at RHIC and the LHC},
author = {Alvioli, M. and Frankfurt, L. and Perepelitsa, D. V. and Strikman, M.},
abstractNote = {We test the hypothesis that configurations of a proton with a large-x parton, xp≳0.1, have a smaller than average size. The QCD Q2 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 xp-dependence of the average interaction strength, σ(xp), 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 σ(xp) 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-xp parton should interact much more weakly than those in an average configuration, a phenomenon in line with explanations of the EMC effect for large-xp quarks in nuclei based on color screening.},
doi = {10.1103/PhysRevD.98.071502},
journal = {Physical Review. D.},
number = 7,
volume = 98,
place = {United States},
year = {Thu Oct 11 00:00:00 EDT 2018},
month = {Thu Oct 11 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevD.98.071502

Citation Metrics:
Cited by: 10 works
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Figures / Tables:

FIG. 1 FIG. 1: Schematic representation of a proton-nucleus collision with a fixed geometry of the target nucleus, with a more weakly (more strongly) interacting projectile proton on the left (right). The red tube shows the projection of the projectile proton’s transverse size through the nucleus, with impacted nucleons in red. Typicalmore » observables have contributions from both types of events, while large-xp configurations may preferentially select weakly interacting cases (left).« less

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