Coherent J/ψ photoproduction in ultra-peripheral PbPb collisions at sNN=2.76TeV with the CMS experiment

The cross section for coherent J/ψ photoproduction accompanied by at least one neutron on one side of the interaction point and no neutron activity on the other side, Xn0n, is measured with the CMS experiment in ultra-peripheral PbPb collisions at √sN N = 2.76 TeV. The analysis is based on a data...

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Main Authors:	Khachatryan, Vardan, Sirunyan, A. M., Tumasyan, A. R., Adam, Wolfgang, Aşilar, Ece, Md. Ali, Mohd. Adli
Format:	Article
Language:	English English
Published:	Elsevier 2017
Subjects:	Q Science (General) QC Physics
Online Access:	http://irep.iium.edu.my/63006/ http://irep.iium.edu.my/63006/ http://irep.iium.edu.my/63006/ http://irep.iium.edu.my/63006/3/63006_Coherent%20photoproduction%20in%20ultra-peripheral%20PbPb%20collisions%20_article.htm http://irep.iium.edu.my/63006/2/63006_Coherent%20photoproduction%20in%20ultra-peripheral%20PbPb%20collisions%20_scopus.pdf

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spelling	iium-630062018-06-21T02:52:11Z http://irep.iium.edu.my/63006/ Coherent J/ψ photoproduction in ultra-peripheral PbPb collisions at sNN=2.76TeV with the CMS experiment Khachatryan, Vardan Sirunyan, A. M. Tumasyan, A. R. Adam, Wolfgang Aşilar, Ece Md. Ali, Mohd. Adli Q Science (General) QC Physics The cross section for coherent J/ψ photoproduction accompanied by at least one neutron on one side of the interaction point and no neutron activity on the other side, Xn0n, is measured with the CMS experiment in ultra-peripheral PbPb collisions at √sN N = 2.76 TeV. The analysis is based on a data sample corresponding to an integrated luminosity of 159 μb−1, collected during the 2011 PbPb run. The J/ψ mesons are reconstructed in the dimuon decay channel, while neutrons are detected using zero degree calorimeters. The measured cross section is dσcoh Xn0n /dy(J/ψ) = 0.36 ± 0.04 (stat) ± 0.04 (syst) mb in the rapidity interval 1.8 < \|y\| < 2.3. Using a model for the relative rate of coherent photoproduction processes, this Xn0n measurement gives a total coherent photoproduction cross section of dσcoh/dy(J/ψ) = 1.82±0.22 (stat)±0.20 (syst)±0.19 (theo) mb. The data strongly disfavor the impulse approximation model prediction, indicating that nuclear effects are needed to describe coherent J/ψ photoproduction in γ + Pb interactions. The data are found to be consistent with the leading twist approximation, which includes nuclear gluon shadowing. Elsevier 2017-11-10 Article PeerReviewed application/pdf en http://irep.iium.edu.my/63006/3/63006_Coherent%20photoproduction%20in%20ultra-peripheral%20PbPb%20collisions%20_article.htm application/pdf en http://irep.iium.edu.my/63006/2/63006_Coherent%20photoproduction%20in%20ultra-peripheral%20PbPb%20collisions%20_scopus.pdf Khachatryan, Vardan and Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Aşilar, Ece and Md. Ali, Mohd. Adli (2017) Coherent J/ψ photoproduction in ultra-peripheral PbPb collisions at sNN=2.76TeV with the CMS experiment. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 772. pp. 489-511. ISSN 0370-2693 https://www.sciencedirect.com/science/article/pii/S0370269317307955?via%3Dihub 10.1016/j.physletb.2017.07.001
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English English
topic	Q Science (General) QC Physics
spellingShingle	Q Science (General) QC Physics Khachatryan, Vardan Sirunyan, A. M. Tumasyan, A. R. Adam, Wolfgang Aşilar, Ece Md. Ali, Mohd. Adli Coherent J/ψ photoproduction in ultra-peripheral PbPb collisions at sNN=2.76TeV with the CMS experiment
description	The cross section for coherent J/ψ photoproduction accompanied by at least one neutron on one side of the interaction point and no neutron activity on the other side, Xn0n, is measured with the CMS experiment in ultra-peripheral PbPb collisions at √sN N = 2.76 TeV. The analysis is based on a data sample corresponding to an integrated luminosity of 159 μb−1, collected during the 2011 PbPb run. The J/ψ mesons are reconstructed in the dimuon decay channel, while neutrons are detected using zero degree calorimeters. The measured cross section is dσcoh Xn0n /dy(J/ψ) = 0.36 ± 0.04 (stat) ± 0.04 (syst) mb in the rapidity interval 1.8 < \|y\| < 2.3. Using a model for the relative rate of coherent photoproduction processes, this Xn0n measurement gives a total coherent photoproduction cross section of dσcoh/dy(J/ψ) = 1.82±0.22 (stat)±0.20 (syst)±0.19 (theo) mb. The data strongly disfavor the impulse approximation model prediction, indicating that nuclear effects are needed to describe coherent J/ψ photoproduction in γ + Pb interactions. The data are found to be consistent with the leading twist approximation, which includes nuclear gluon shadowing.
format	Article
author	Khachatryan, Vardan Sirunyan, A. M. Tumasyan, A. R. Adam, Wolfgang Aşilar, Ece Md. Ali, Mohd. Adli
author_facet	Khachatryan, Vardan Sirunyan, A. M. Tumasyan, A. R. Adam, Wolfgang Aşilar, Ece Md. Ali, Mohd. Adli
author_sort	Khachatryan, Vardan
title	Coherent J/ψ photoproduction in ultra-peripheral PbPb collisions at sNN=2.76TeV with the CMS experiment
title_short	Coherent J/ψ photoproduction in ultra-peripheral PbPb collisions at sNN=2.76TeV with the CMS experiment
title_full	Coherent J/ψ photoproduction in ultra-peripheral PbPb collisions at sNN=2.76TeV with the CMS experiment
title_fullStr	Coherent J/ψ photoproduction in ultra-peripheral PbPb collisions at sNN=2.76TeV with the CMS experiment
title_full_unstemmed	Coherent J/ψ photoproduction in ultra-peripheral PbPb collisions at sNN=2.76TeV with the CMS experiment
title_sort	coherent j/ψ photoproduction in ultra-peripheral pbpb collisions at snn=2.76tev with the cms experiment
publisher	Elsevier
publishDate	2017
url	http://irep.iium.edu.my/63006/ http://irep.iium.edu.my/63006/ http://irep.iium.edu.my/63006/ http://irep.iium.edu.my/63006/3/63006_Coherent%20photoproduction%20in%20ultra-peripheral%20PbPb%20collisions%20_article.htm http://irep.iium.edu.my/63006/2/63006_Coherent%20photoproduction%20in%20ultra-peripheral%20PbPb%20collisions%20_scopus.pdf
first_indexed	2023-09-18T21:29:19Z
last_indexed	2023-09-18T21:29:19Z
_version_	1777412403807387648

Coherent J/ψ photoproduction in ultra-peripheral PbPb collisions at sNN=2.76TeV with the CMS experiment

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