Coherent <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi mathvariant="normal">J</mml:mi><mml:mo stretchy="false">/</mml:mo><mml:mi>ψ</mml:mi></mml:math> photoproduction in ultra-peripheral Pb–Pb collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.gif" overflow="scroll"><mml:msqrt><mml:msub><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">NN</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>2.76</mml:mn><mml:mtext> </mml:mtext><mml:mtext>TeV</mml:mtext></mml:math>
B. AbelevLawrence Livermore National Laboratory, Livermore, CA, United StatesJ. AdamFaculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech RepublicD. AdamováNuclear Physics Institute, Academy of Sciences of the Czech Republic, Řež u Prahy, Czech RepublicA. AdareYale University, New Haven, CT, United StatesM. M. AggarwalPhysics Department, Panjab University, Chandigarh, IndiaG. Aglieri RinellaEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandM. AgnelloSezione INFN, Turin, ItalyA. G. AgocsKFKI Research Institute for Particle and Nuclear Physics, Hungarian Academy of Sciences, Budapest, HungaryA. AgostinelliDipartimento di Fisica dellʼUniversità and Sezione INFN, Bologna, ItalyS. Aguilar SalazarInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoZ. AhammedVariable Energy Cyclotron Centre, Kolkata, IndiaA. Ahmad MasoodiDepartment of Physics Aligarh Muslim University, Aligarh, IndiaN. AhmadDepartment of Physics Aligarh Muslim University, Aligarh, IndiaSul-Ah AhnGangneung-Wonju National University, Gangneung, South KoreaS. U. AhnGangneung-Wonju National University, Gangneung, South KoreaA. AkindinovInstitute for Theoretical and Experimental Physics, Moscow, RussiaD. AleksandrovRussian Research Centre Kurchatov Institute, Moscow, RussiaB. AlessandroSezione INFN, Turin, ItalyR. Alfaro MolinaInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoA. AliciCentro Fermi – Centro Studi e Ricerche e Museo Storico della Fisica “Enrico Fermi”, Rome, ItalyA. AlkinE. Almaráz AviñaSezione INFN, Turin, ItalyJ. AlmeFaculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech RepublicT. AltDipartimento di Fisica dell'Università and Sezione INFN, Bologna, ItalyV. AltiniRussian Research Centre Kurchatov Institute, Moscow, RussiaS. AltinpinarSezione INFN, Turin, ItalyI. AltsybeevSezione INFN, Bologna, ItalyC. AndreiCentro Fermi – Centro Studi e Ricerche e Museo Storico della Fisica "Enrico Fermi", Rome, ItalyA. AndronicV. AnguelovRussian Research Centre Kurchatov Institute, Moscow, RussiaJ. AnielskiFaculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech RepublicC. AnsonSezione INFN, Bologna, ItalyT. AntičićDipartimento di Fisica dell'Università and Sezione INFN, Bologna, ItalyF. AntinoriInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoP. AntonioliL. AphecetcheCentro Fermi – Centro Studi e Ricerche e Museo Storico della Fisica "Enrico Fermi", Rome, ItalyH. AppelshäuserGangneung-Wonju National University, Gangneung, South KoreaN. ArborInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoS. ArcelliSezione INFN, Turin, ItalyA. ArendN. ArmestoInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoR. ArnaldiInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoT. AronssonDipartimento di Fisica dell'Università and Sezione INFN, Bologna, ItalyI. C. ArseneSezione INFN, Bologna, ItalyM. ArslandokInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoA. AsryanA. AugustinusR. AverbeckInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoT. C. AwesJ. ÄystöFaculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech RepublicM. D. AzmiM. BachInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoA. BadalàY. W. BaekR. BailhacheInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoR. BalaInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoR. Baldini FerroliInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoA. BaldisseriF. Baltasar Dos Santos PedrosaInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoJ. BánFaculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech RepublicR. C. BaralR. BarberaInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoF. BarileInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoG. G. BarnaföldiPhysics Department, Panjab University, Chandigarh, IndiaL. S. BarnbyV. BarretRussian Research Centre Kurchatov Institute, Moscow, RussiaJ. BartkeFaculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech RepublicM. BasileInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoN. BastidInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoS. BasuSezione INFN, Turin, ItalyB. BathenSezione INFN, Turin, ItalyG. BatigneInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoB. BatyunyaSezione INFN, Turin, ItalyC. BaumannCentro Fermi – Centro Studi e Ricerche e Museo Storico della Fisica "Enrico Fermi", Rome, ItalyI. G. BeardenKenneth M. BeckGangneung-Wonju National University, Gangneung, South KoreaN. K. BeheraI. BelikovSezione INFN, Bologna, ItalyF. BelliniInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoR. BellwiedInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoE. Belmont‐MorenoSezione INFN, Turin, ItalyG. BencédiInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoS. BeolèSezione INFN, Turin, ItalyI. BerceanuCentro Fermi – Centro Studi e Ricerche e Museo Storico della Fisica "Enrico Fermi", Rome, ItalyA. BercuciY. BerdnikovD. BerényiSezione INFN, Turin, ItalyA. A. E. BergognonD. BerzanoSezione INFN, Turin, ItalyL. BetevSezione INFN, Bologna, ItalyA. BhasinA. K. BhatiInstitute for Theoretical and Experimental Physics, Moscow, RussiaJ. BhomFaculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech RepublicN. BianchiInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoL. BianchiSezione INFN, Bologna, ItalyC. BianchinCentro Fermi – Centro Studi e Ricerche e Museo Storico della Fisica "Enrico Fermi", Rome, ItalyJ. BielčíkFaculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech RepublicJ. BielčíkováFaculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech RepublicA. BilandzicS. BjelogrlicSezione INFN, Turin, Italy
2012lv
ABI
Annotatsiya
The ALICE Collaboration has made the first measurement at the LHC of J/ψ photoproduction in ultra-peripheral Pb–Pb collisions at sNN=2.76TeV. The J/ψ is identified via its dimuon decay in the forward rapidity region with the muon spectrometer for events where the hadronic activity is required to be minimal. The analysis is based on an event sample corresponding to an integrated luminosity of about 55 μb−1. The cross section for coherent J/ψ production in the rapidity interval −3.6<y<−2.6 is measured to be dσJ/ψcoh/dy=1.00±0.18(stat)−0.26+0.24(syst)mb. The result is compared to theoretical models for coherent J/ψ production and found to be in good agreement with those models which include nuclear gluon shadowing.
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