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Title: Estimating nonlinear effects in forward dijet production in ultra-peripheral heavy ion collisions at the LHC

Using the framework that interpolates between the leading power limit of the color glass condensate and the high energy (or k T ) factorization we calculate the direct component of the forward dijet production in ultra-peripheral Pb–Pb collisions atCMenergy 5.1 TeV per nucleon pair. The formalism is applicablewhen the average transversemomentum of the dijet system P T is much bigger than the saturation scale Q s , P T >> Qs , while the imbalance of the dijet system can be arbitrary. The cross section is uniquely sensitive to theWeizsäcker–Williams (WW) unintegrated gluon distribution, which is far less known from experimental data than the most common dipole gluon distribution appearing in inclusive small-x processes. We also calculated cross sections and nuclear modification ratios using WW gluon distribution obtained from the dipole gluon density through the Gaussian approximation. The dipole gluon distribution used to get WW was fitted to the inclusive HERA data with the nonlinear extension of unified BFKL+DGLAP evolution equation. The saturation effects are visible but rather weak for realistic p T cut on the dijet system, reaching about 20% with the cut as low as 6 GeV. Finally, we find that the LO collinear factorization with nuclear leading-twistmore » shadowing predicts quite similar effects.« less
Authors:
 [1] ;  [2] ;  [2] ;  [1] ;  [1]
  1. Pennsylvania State Univ., University Park, PA (United States). Dept. of Physics
  2. Polish Academy of Sciences, Krakow (Poland). Inst. of Nuclear Physics
Publication Date:
Grant/Contract Number:
FG02-93ER20097; SC0002145; FG02-93ER40771; 2015/17/B/ST2/01838; 2013/10/E/ST2/00656
Type:
Published Article
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: 77; Journal Issue: 5; Journal ID: ISSN 1434-6044
Publisher:
Springer
Research Org:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS
OSTI Identifier:
1361943
Alternate Identifier(s):
OSTI ID: 1389276

Kotko, P., Kutak, K., Sapeta, S., Stasto, A. M., and Strikman, M.. Estimating nonlinear effects in forward dijet production in ultra-peripheral heavy ion collisions at the LHC. United States: N. p., Web. doi:10.1140/epjc/s10052-017-4906-6.
Kotko, P., Kutak, K., Sapeta, S., Stasto, A. M., & Strikman, M.. Estimating nonlinear effects in forward dijet production in ultra-peripheral heavy ion collisions at the LHC. United States. doi:10.1140/epjc/s10052-017-4906-6.
Kotko, P., Kutak, K., Sapeta, S., Stasto, A. M., and Strikman, M.. 2017. "Estimating nonlinear effects in forward dijet production in ultra-peripheral heavy ion collisions at the LHC". United States. doi:10.1140/epjc/s10052-017-4906-6.
@article{osti_1361943,
title = {Estimating nonlinear effects in forward dijet production in ultra-peripheral heavy ion collisions at the LHC},
author = {Kotko, P. and Kutak, K. and Sapeta, S. and Stasto, A. M. and Strikman, M.},
abstractNote = {Using the framework that interpolates between the leading power limit of the color glass condensate and the high energy (or kT ) factorization we calculate the direct component of the forward dijet production in ultra-peripheral Pb–Pb collisions atCMenergy 5.1 TeV per nucleon pair. The formalism is applicablewhen the average transversemomentum of the dijet system PT is much bigger than the saturation scale Qs , PT >> Qs , while the imbalance of the dijet system can be arbitrary. The cross section is uniquely sensitive to theWeizsäcker–Williams (WW) unintegrated gluon distribution, which is far less known from experimental data than the most common dipole gluon distribution appearing in inclusive small-x processes. We also calculated cross sections and nuclear modification ratios using WW gluon distribution obtained from the dipole gluon density through the Gaussian approximation. The dipole gluon distribution used to get WW was fitted to the inclusive HERA data with the nonlinear extension of unified BFKL+DGLAP evolution equation. The saturation effects are visible but rather weak for realistic pT cut on the dijet system, reaching about 20% with the cut as low as 6 GeV. Finally, we find that the LO collinear factorization with nuclear leading-twist shadowing predicts quite similar effects.},
doi = {10.1140/epjc/s10052-017-4906-6},
journal = {European Physical Journal. C, Particles and Fields},
number = 5,
volume = 77,
place = {United States},
year = {2017},
month = {5}
}