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

The CMS collaboration

doi:10.1016/j.physletb.2017.07.001

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

The CMS collaboration

Yerevan Physics Institute
Institut für Hochenergiephysik
Vienna University of Technology
National Centre for Particle and High Energy Physics
Universite Paris-Saclay
European Organization for Nuclear Research
Imperial College London
University of Antwerp
Vrjie Universiteit Brussel
Université Libre de Bruxelles
State Key Laboratory of Nuclear Physics and Technology
Ghent University
University of Louvain
Université de Strasbourg
Université de Mons
Centro Brasileiro de Pesquisas Fisicas
Rua São Francisco de Xavier
University of Campinas (UNICAMP)
São Paulo State University
Federal University of ABC (UFABC)
Centre national de la recherche scientifique
Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences
University of Sofia
Beihang University
Institute of High Energy Physics, Chinese Academy of Sciences
Ip Paris
Universidad de Los Andes, Colombia
CSIC-Univ. Cantabria
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split
Faculty of Science, University of Split
Ruđer Bošković Institute
University of Cyprus
Charles University
Joint Institute for Nuclear Research, Dubna
Egyptian Network of High Energy Physics
Zewail City of Science and Technology
Ain Shams University
British University in Egypt
National Institute of Chemical Physics and Biophysics, Tallinn
University of Helsinki
Helsinki Institute of Physics
LUT University
Université de Haute Alsace
Université Paris-Sud
IGFL, Université de Lyon, Université Lyon 1
Georgian Technical University
Tbilisi State University
Ilia State University (ISU)
RWTH Aachen University
c/o DESY
Universität Hamburg
Joint Faculty of the Brandenburg University of Technology Cottbus Senftenberg
Universität Karlsruhe/Forschungszentrum Karlsruhe
Moscow State University
NCSR Demokritos
University of Athens
University of Ioannina
Wigner Research Centre for Physics
Institute of Nuclear Research ATOMKI
University of Debrecen
National Institute of Science Education and Research
Indian Institute of Science Education and Research Bhopal
Panjab University
University of Delhi
Saha Institute of Nuclear Physics
Bhabha Atomic Research Centre
Tata Institute of Fundamental Research, Mumbai
King Abdulaziz University
University of Visva-Bharati
University of Ruhuna
Indian Institute of Science Education and Research (IISER)
Institute for Research in Fundamental Sciences (IPM)
Isfahan University of Technology
University of Tehran
Islamic Azad University, Science and Research Branch
University College Dublin
INFN Sezione di Bari
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Politecnico di Bari
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Università degli Studi di Catania
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Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
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Università degli Studi della Basilicata
Università G. Marconi
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University of Padova
Laboratori Nazionali di Legnaro
INFN Sezione di Pavia
University of Pavia
INFN Sezione di Perugia
University of Perugia
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Scuola Normale Superiore di Pisa
University of Siena
University of Pisa
Purdue University
Sezione di Roma
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Laboratory of Molecular Pathology
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Kangwon National University
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Institute for Nuclear Research of the Russian Academy of Sciences
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National Research Nuclear University MEPhI
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
Kurchatov Institute
University of Belgrade
University of Belgrade
Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT)
Universidad Autónoma de Madrid
University of Oviedo
National Technical University of Athens
Riga Technical University
Eötvös Loránd University
Warsaw University of Technology
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ETH Zurich
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University of Bristol
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University of Southampton
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Women and Infants Hospital of Rhode Island-Warren Alpert Medical School of Brown University
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136 Citations (Scopus)

Abstract

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, X_n0_n, is measured with the CMS experiment in ultra-peripheral PbPb collisions at s_NN=2.76TeV. The analysis is based on a data sample corresponding to an integrated luminosity of 159μb⁻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 dσ_{X_n0_n} ^coh/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 X_n0_n measurement gives a total coherent photoproduction cross section of dσ^coh/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.

Original language	English
Pages (from-to)	489-511
Number of pages	23
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	772
DOIs	https://doi.org/10.1016/j.physletb.2017.07.001
Publication status	Published - 10 Sept 2017

Keywords

CMS
Heavy ion collisions
J/Psi
Physics
UPC
Ultra-peripheral collisions

Access to Document

10.1016/j.physletb.2017.07.001

Cite this

@article{ecde7e6427b94c2283d35734f3323781,

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

abstract = "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 sNN=2.76TeV. The analysis is based on a data sample corresponding to an integrated luminosity of 159μb−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 dσXn0n coh/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.",

keywords = "CMS, Heavy ion collisions, J/Psi, Physics, UPC, Ultra-peripheral collisions",

author = "\{The CMS collaboration\} and V. Khachatryan and Sirunyan, \{A. M.\} and A. Tumasyan and W. Adam and E. Asilar and T. Bergauer and J. Brandstetter and E. Brondolin and M. Dragicevic and J. Er{\"o} and M. Flechl and M. Friedl and R. Fr{\"u}hwirth and Ghete, \{V. M.\} and C. Hartl and N. H{\"o}rmann and J. Hrubec and M. Jeitler and A. K{\"o}nig and M. Krammer and I. Kr{\"a}tschmer and D. Liko and T. Matsushita and I. Mikulec and D. Rabady and N. Rad and B. Rahbaran and H. Rohringer and J. Schieck and R. Sch{\"o}fbeck and J. Strauss and W. Treberer-Treberspurg and W. Waltenberger and Wulz, \{C. E.\} and V. Mossolov and N. Shumeiko and \{Suarez Gonzalez\}, J. and A. Zghiche and F. Beaudette and C. Charlot and O. Davignon and \{Granier de Cassagnac\}, R. and M. Nguyen and C. Ochando and P. Paganini and R. Salerno and Y. Sirois and A. Zabi and Sauvan, \{J. B.\} and \{De Wit\}, A.",

note = "Publisher Copyright: {\textcopyright} 2017 The Author(s)",

year = "2017",

month = sep,

day = "10",

doi = "10.1016/j.physletb.2017.07.001",

language = "English",

volume = "772",

pages = "489--511",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Coherent J/ψ photoproduction in ultra-peripheral PbPb collisions at sNN=2.76TeV with the CMS experiment

AU - The CMS collaboration

AU - Khachatryan, V.

AU - Sirunyan, A. M.

AU - Tumasyan, A.

AU - Adam, W.

AU - Asilar, E.

AU - Bergauer, T.

AU - Brandstetter, J.

AU - Brondolin, E.

AU - Dragicevic, M.

AU - Erö, J.

AU - Flechl, M.

AU - Friedl, M.

AU - Frühwirth, R.

AU - Ghete, V. M.

AU - Hartl, C.

AU - Hörmann, N.

AU - Hrubec, J.

AU - Jeitler, M.

AU - König, A.

AU - Krammer, M.

AU - Krätschmer, I.

AU - Liko, D.

AU - Matsushita, T.

AU - Mikulec, I.

AU - Rabady, D.

AU - Rad, N.

AU - Rahbaran, B.

AU - Rohringer, H.

AU - Schieck, J.

AU - Schöfbeck, R.

AU - Strauss, J.

AU - Treberer-Treberspurg, W.

AU - Waltenberger, W.

AU - Wulz, C. E.

AU - Mossolov, V.

AU - Shumeiko, N.

AU - Suarez Gonzalez, J.

AU - Zghiche, A.

AU - Beaudette, F.

AU - Charlot, C.

AU - Davignon, O.

AU - Granier de Cassagnac, R.

AU - Nguyen, M.

AU - Ochando, C.

AU - Paganini, P.

AU - Salerno, R.

AU - Sirois, Y.

AU - Zabi, A.

AU - Sauvan, J. B.

AU - De Wit, A.

PY - 2017/9/10

Y1 - 2017/9/10

N2 - 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 sNN=2.76TeV. The analysis is based on a data sample corresponding to an integrated luminosity of 159μb−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 dσXn0n coh/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.

AB - 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 sNN=2.76TeV. The analysis is based on a data sample corresponding to an integrated luminosity of 159μb−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 dσXn0n coh/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.

KW - CMS

KW - Heavy ion collisions

KW - J/Psi

KW - Physics

KW - UPC

KW - Ultra-peripheral collisions

U2 - 10.1016/j.physletb.2017.07.001

DO - 10.1016/j.physletb.2017.07.001

M3 - Article

AN - SCOPUS:85030700462

SN - 0370-2693

VL - 772

SP - 489

EP - 511

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics