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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Elsevier
2017
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| Online Access: | 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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| 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 |
| building | IIUM Repository |
| collection | Online Access |
| 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. |
| first_indexed | 2025-11-14T17:01:18Z |
| format | Article |
| id | iium-63006 |
| institution | International Islamic University Malaysia |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-14T17:01:18Z |
| publishDate | 2017 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| 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 |
| 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 |
| title | 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_short | 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 |
| topic | Q Science (General) QC Physics |
| 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 |