J/ψ photoproduction in Pb-Pb peripheral collisions at sNN=5 TeV

R Aaij,S Klaver,S Kotriakhova,A Leflat,B G Siddi,O Yushchenko,A Golutvin,C Haen,M De Serio,B Pietrzyk,T J V Bowcock,S Malde,L Shekhtman,C Trippl,A Semennikov,G Mancinelli,B D C Westhenry,A Minotti,C R Jones,M De Cian,F Muheim,A Bitadze,S Perazzini,T Boettcher,M Mccann,A Palano,B Leverington,L Del Buono,P Muzzetto,Ph Ghez,J H Lopes,S De Capua,C L Da Silva,S Blusk,O Lupton,O Maev,G Graziani,S Neubert,V Vagnoni,D Pinci,A Jawahery,S Esen,X Yuan,M Rotondo,M Veltri,K Belous,H V Cliff,W Parker,S Vecchi,F Teubert,U Egede,M Vesterinen,R Calabrese,A Vorobyev,D Lucchesi,L Tomassetti,N Neufeld,E Ben-Haim,A Contu,I Polyakov,C Gaspar,L Giubega,A Dovbnya,M Shapkin,D Savrina,A Gioventù,G Panshin,S Ricciardi,R Mcnulty,C Matteuzzi,P E L Clarke,A Zhelezov,G Ciezarek,A Bertolin,A Schopper,J J Back,E Jans,C Fitzpatrick,V Kudryavtsev,Ia Bezshyiko,L L Pappalardo,M Van Beuzekom,A Buonaura,A Lusiani,B Couturier,T Kvaratskheliya,Ph Charpentier,V Chobanova,H.-P Dembinski,C Langenbruch,F Polci,G Raven,S Simone,F Stagni,P Gandini,A Hicheur,R Lindner,W Qian,C Göbel,C Parkes,M.-N Minard,U Uwer,V Obraztsov,M T Tran,S A Wotton,C Satriano,G Passaleva,L Grillo,S Hansmann-Menzemer,M Tobin,G Bencivenni,B Schmidt,P Griffith,A Bursche,P Owen,R Jacobsson,B Khanji,M Needham,P Durante,M Van Veghel,A Gomes,N Sagidova,M S Rangel,E Van Herwijnen,V Egorychev,D Melnychuk,F Machefert,T Pajero,T Kirn,V Tisserand,G Lanfranchi,C B Van Hulse,E Thomas,C J G Onderwater,N Harnew,S Monteil,J Closier,Y Li,U Marconi,M Patel,O Steinkamp,A B Rodrigues,I Nasteva,S Kholodenko,F Blanc,N K Watson,G Corti,A Falabella,J A B Coelho,M Andreotti,E Santovetti,M Schmelling,R Currie,L Kravchuk,M Pappagallo,O De Aguiar Francisco,L De Paula,A Satta,A Ukleja,F Suljik,G Manca,L Sun,A C Dos Reis,D Xiao,A Grecu,P Perret,F F Wilson,P Collins,V Dobishuk,L Garrido,F Fontanelli,G Carboni,E Gushchin,N Tuning,M Gandelman,S H Lee,M Van Dijk,C Patrignani,F Dordei,S Luchuk,F J P Soler,J Maratas,O Zenaiev,P Naik,D Vieira,V Gibson,S Farry,S Easo,D Hynds,B Spaan,J Marks,Y Zhou,A Lai,M Palutan,A Petrolini,J M De Miranda,R Le Gac,A Oyanguren,R Santacesaria,R J Barlow,A Bay,R Schwemmer,S Kandybei,V Shevchenko,P De Simone,G Wormser,S Gambetta,V Chulikov,A Massafferri,A Ustyuzhanin,G Cavallero,A Snoch,A Dziurda,T Lesiak,O Schneider,D C Craik,P Vincent,M Witek,E Cogneras,K De Bruyn,D De Simone,B Dey,C Bozzi,X Han,M Karacson,V Vorobyev,P Campana,A Battig,E Polycarpo,R Mountain,J He,V Placinta,A Dzyuba,R Nandakumar,M Straticiuc,D Manuzzi,K Heijhoff,S Cholak,I A Monroy,D Wiedner,M Kucharczyk,P Spradlin,G Haefeli,E Rodrigues,P Di Nezza,M J Morello,M Fiorini,R A Fini,K Müller,J A De Vries,P Krokovny,D Websdale,S Zucchelli,B Jost,A Pearce,K Wyllie,T Gys,A Davis,R Lefèvre,Y Zhang,M D Sokoloff,I Longstaff,G Martellotti,G Alkhazov,T Ruf,S Eidelman,T D Nguyen,G Valenti,F Maciuc,M H Schune,H Malygina,I Carli,X K Zhou ,M Martinelli,S E Hollitt,M Karpov ,T Harrison,R I Rabadán Trejo ,C Bertella,A G Downes ,G Meier,A Usachov,H Yin,T H Hancock,N 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Schulte,S T’jampens ,M Ramos Pernas,Alexander Mclean Marshall ,F Pisani,P Carniti,A Bizzeti,T H Lin ,T Gaintseva,L An,L M Greeven ,S Bifani,C Nguyen-Mau,J J Saborido Silva,J Brodzicka,A Konoplyannikov,M Stahl,Z Aliouche,W Baldini,M Alexander,L Meyer Garcia,G Morello,B Fang,R Silva Coutinho,J Wang,V Duk,M Frank,W Krupa,E Shmanin,H Dijkstra,W Barter,C J Pawley ,E Zaffaroni,S Maccolini,Eduard Ursov ,A M Hennequin,S Nieswand,G J Kunde,J S Butter,M Ferro‐Luzzi ,X Liang,L Carus ,E Gersabeck,Z Ren,J G Smeaton,M Calvo Gomez,D Marangotto,C T Dean,M Mulder,M Cattaneo,Aleksandr Solovev ,R Litvinov ,М Королев ,J García Pardiñas,M Brodski,S Schael,Xu Li ,P Vázquez Regueiro ,M Pili,V Coco,A M Donohoe ,C Pappenheimer,M Veronesi,M Rama,M Ferrillo,J J Velthuis,A Mauri,A Beiter,G Frau,J Fu,C Burr,S Petrucci,V Denysenko,M Hilton,K Dreimanis,L Capriotti,E Graugés,A Chernov,E B Shields ,А Малинин ,F Baryshnikov,B Małecki ,L R Madhan Mohan,I Bediaga,H Viemann,M Calvi,F Martínez Vidal ,X Zhu,A Maevskiy,L M 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doi:10.1103/physrevc.105.l032201

Abstract

The photoproduction of J/ψ mesons at low transverse momentum is studied in peripheral lead-lead collisions collected by the LHCb Collaboration at a center-of-mass energy per nucleon pair of 5TeV, corresponding to an integrated luminosity of 210 μb−1. The J/ψ candidates are reconstructed through the prompt decay into two muons of opposite charge in the rapidity region of 2.0<y<4.5. The results significantly improve previous measurements and are compared to the latest theoretical prediction.Received 9 August 2021Accepted 14 February 2022DOI:https://doi.org/10.1103/PhysRevC.105.L032201Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.©2022 CERN, for the LHCb CollaborationPhysics Subject Headings (PhySH)Research AreasPhotonuclear reactionsPhysical SystemsQuarkoniaNuclear Physics

Highlights

One of the main open subjects in ultrarelativistic heavyion physics is the study of the quark-gluon plasma (QGP), an exotic state of hadronic matter predicted by quantum chromodynamics (QCD)
The ALICE [11] and STAR [12] Collaborations measured an excess with respect to expectations from purely hadronic production of J/ψ mesons at very low pT, where pT is the component of the J/ψ momentum transverse to the beam, in hadronic lead-lead (Pb√-Pb) collisions at the center-of-mass energy per nucleon pair sN√N = 2.76 TeV and gold-gold collisions at sNN = 200 GeV (193 GeV)
It was posited that this excess is due to photoproduced J/ψ mesons, caused by the coherent interaction of the large electromagnetic fields generated by the projectile with the target nucleus [13]

Summary

Npart σpart

In this Letter, the J/ψ photoproduction differential yield is measured, defined as d YJ/iψ. MB tot d2YJ/iψ = d YJ/iψ 1 , (2) d pTdy dy pT where i indicates the Nc range, NJi/ψ is the number of photoproduced J/ψ meson candidates reconstructed through the J/ψ → μ+μ− decay channel in the (pT, y) interval of width ( pT, y), B = (5.961 ± 0.033)% [24] is the branching fraction of the decay J/ψ → μ+μ−, NMi B is the total number of MB events, and εtiot is the efficiency to reconstruct and select the J/ψ candidates. An unbinned fit of these candidates is performed using a Crystal Ball (CB) function for the signal and a first-order polynomial for the background. J/ψ mesons are disentangled through an unbinned maximum likelihood fit to the dimuon pT spectrum.

Data Signal Background

Data No overlap effects Overlap effects