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Title: Confronting the impact parameter dependent JIMWLK evolution with HERA data

Abstract

The small-x evolution of protons is determined from numerical solutions of the JIMWLK equations, starting from an initial condition at moderate x for a finite size proton. The resulting dipole amplitude is used to calculate the total reduced cross section σ r and charm reduced cross section σ rc, as well as diffractive vector meson production. We compare results to experimental data from HERA and discuss fundamental problems arising from the regime sensitive to non-perturbative physics. We emphasize that information on the gluonic content of the proton, gluon spatial distributions and correlations over wide ranges in x, which can in principle be constrained by our study, are essential ingredients for describing the initial state in proton-proton and proton-ion collisions. Future electron nucleus collisions at an electron-ion collider will provide important additional insight for heavier nuclei. As a result, we further demonstrate that it is not possible to probe gluon saturation in electron-proton collision at HERA energies and that electron-heavy ion collisions will be essential to access the saturation regime.

Authors:
;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Under Secretary for Science and Energy (US)
OSTI Identifier:
1464581
Alternate Identifier(s):
OSTI ID: 1471187
Report Number(s):
BNL-209041-2018-JAAM
Journal ID: ISSN 2470-0010; PRVDAQ; 034013
Grant/Contract Number:  
AC02-05CH11231; SC0012704
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 98 Journal Issue: 3; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Mäntysaari, Heikki, and Schenke, Björn. Confronting the impact parameter dependent JIMWLK evolution with HERA data. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.98.034013.
Mäntysaari, Heikki, & Schenke, Björn. Confronting the impact parameter dependent JIMWLK evolution with HERA data. United States. doi:10.1103/PhysRevD.98.034013.
Mäntysaari, Heikki, and Schenke, Björn. Tue . "Confronting the impact parameter dependent JIMWLK evolution with HERA data". United States. doi:10.1103/PhysRevD.98.034013.
@article{osti_1464581,
title = {Confronting the impact parameter dependent JIMWLK evolution with HERA data},
author = {Mäntysaari, Heikki and Schenke, Björn},
abstractNote = {The small-x evolution of protons is determined from numerical solutions of the JIMWLK equations, starting from an initial condition at moderate x for a finite size proton. The resulting dipole amplitude is used to calculate the total reduced cross section σr and charm reduced cross section σrc, as well as diffractive vector meson production. We compare results to experimental data from HERA and discuss fundamental problems arising from the regime sensitive to non-perturbative physics. We emphasize that information on the gluonic content of the proton, gluon spatial distributions and correlations over wide ranges in x, which can in principle be constrained by our study, are essential ingredients for describing the initial state in proton-proton and proton-ion collisions. Future electron nucleus collisions at an electron-ion collider will provide important additional insight for heavier nuclei. As a result, we further demonstrate that it is not possible to probe gluon saturation in electron-proton collision at HERA energies and that electron-heavy ion collisions will be essential to access the saturation regime.},
doi = {10.1103/PhysRevD.98.034013},
journal = {Physical Review D},
number = 3,
volume = 98,
place = {United States},
year = {2018},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.98.034013

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Cited by: 3 works
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