6533b86cfe1ef96bd12c7f2f

RESEARCH PRODUCT

Measurement of an Excess in the Yield ofJ/ψat Very LowpTin Pb–Pb Collisions atsNN=2.76  TeV

L. NellenE. FragiacomoBoris BatyunyaJogender SainiChristian SchmidtIan Gardner BeardenPaolo GiubellinoAlexey KuryakinFilimon RoukoutakisAndry Malala RakotozafindrabeTuva Ora Herenui RichertMarkus Bernhard ZimmermannRosario NaniaManuel ColocciA. Villatoro TelloE. López TorresHåvard HelstrupRitsuya HosokawaFedor GuberM. BombaraConstantinos LoizidesA. KolojvariL. M. MinerviniE. Pereira De Oliveira FilhoGraham Richard LeePeter KalinakValery PuninM. SanoMikhail MalaevS.a. ZaporozhetsAustin Vincent HartonA. Karasu UysalAdriana TelescaD. M. Goméz CoralAndrey ZarochentsevJoel Anthony MazerD. BudnikovMartin PoghosyanJ. L. KlayA. R. ReolonAntonio UrasElisa MeninnoCaterina DeplanoSylvain ChapelandAlexander Philipp KalweitPiotr Jan GasikL. A. P. MorenoAli OkatanChristoph MayerU. FrankenfeldBenjamin Andreas HessBogdan Theodor RascanuM. MaseraSergey FilchaginMarco BregantD. Domenicis GimenezJ. PlutaEvgeny RyabinkinYongwook BaekE. MontesF. PrinoB. PolichtchoukAstrid VauthierMichal KopcikA. Rodriguez MansoA. Di MauroChristian ChristensenM. KretzVikas SinghalAntonino ZichichiM. Spyropoulou-stassinakiMarcelo Gameiro MunhozPeter Braun-munzingerSanjeev Singh SambyalMin Jung KweonValeria MucciforaJussi Samuli ViinikainenDmitry FinogeevE. A. R. CasulaMarian KrivdaRalf KeidelAlice ZimmermannMais Kazim Oglu SuleymanovLaurent DucrouxPragati SahooAlexander AkindinovVicente GonzálezOliver Werner ArnoldY. SekiguchiInayat Rasool BhatLilit KarayanS. Vergara LimónParaskevi GanotiPeter LevaiSk Noor AlamDmitry BlauC. RoyM. ValaSubhash SinghaAlexander MamonovRene BellwiedGergely Gabor BarnafoldiCatherine Micaela SilvestreM. C. S. WilliamsArturo TauroG. Tejeda MuñozSoyeon ChoJulius Maximilian GronefeldA. G. BogdanovVladimir KaplinVytautas VislaviciusOksana ShaduraMarek KowalskiMichael Andreas WinnAnnika PassfeldGrzegorz Andrzej WilkMatthias RichterG. Herrera CorralVolodymyr ChelnokovJ. PorterHao WangWanchaloem PoonsawatY. F. RyabovA. De FalcoE. M. FioreSteffen Georg WeberP. L. M. Podesta-lermaRosario TurrisiY. WatanabeTomas Wilhelm SnellmanJ. R. M. AlmarazM. SpacekAndrei Ionut HerghelegiuHeiko EngelD. R. GangadharanThorsten Sven KolleggerS. SadovskyDomenico ColellaFranco MeddiFranck MansoA. NedosekinO. Villalobos BaillieChristian LippmannM. KeilAndile Mothegi WhiteheadM. WildeP. Vande VyvreTsubasa OkuboSonia ParmarMaria VasileiouA. M. RossiV. PaticchioVladimir KovalenkoC. BianchinEvgeny KondratyukM. A. LisaGyula BencediMonika Joanna JakubowskaMartin Andreas VolklVladimir SamsonovDirk HutterM. HeideJinjin PanSergey GorbunovR. T. Jimenez BustamanteM. Rodríguez CahuantziChinorat KobdajRinaldo RuiJ. W. Van HoorneR. A. RicciA. K. BhatiH. Pereira Da CostaIonel StanLevente MolnarAlessandra LattucaJochen KleinLawrence PinskyEleazar CuautleCristina TerrevoliMaitreyee MukherjeeChristine NattrassSergey KiselevJørgen André LienBruno EspagnonMaciej SlupeckiA. MaireAnton JuskoNikolai SmirnovLinus FeldkampAndres SandovalJames Declan MulliganT. J. HumanicRaimond SnellingsSudipan DeRune LangøyRoberta ArnaldiIvan KralikZ. Conesa Del ValleTrine Spedstad TveterR. RussoM. Fusco GirardRaphael Noel TieulentK. ŠAfaříkPreeti DhankherIvan KiselE. NappiA. A. VinogradovPietro CorteseTheo Alexander BrokerDong Jo KimSang Un AhnValentina ZaccoloP. PillotMaximiliano PuccioAndreas MorschDong-hyun KimMiroslav PiknaIndranil DasJacek Tomasz OtwinowskiShingo SakaiMario SittaJaroslav AdamUwe WesterhoffM. PlaninicV. P. KondratievT. BreitnerS. K. GhoshHans Rudolf SchmidtAndrey VasilievRainer Arno Ernst RenfordtEnrico ScomparinSergey EvdokimovJason KaminC. Alves Garcia PradoJihyun BhomAndrew Michael KuberaA. M. GagoPetr NomokonovY. J. KwonA. Szanto De ToledoJ. ZhuCristina BeddaKatie Leanne GrahamSedat AltinpinarT. K. NayakØYstein Senneset HaalandFrancesco BossuAlexander DeistingMartin SchulcJ. AnielskiRashmi RaniwalaCristiane JahnkeM. FaselLucile RonfletteSean MurrayJan WagnerM. A. S. FigueredoV. LentiB. GrinyovUlrich FuchsSandro BjelogrlicSona PochybovaS. K. OhNaghmeh MohammadiA. SzczepankiewiczMarton VargyasC. E. Pérez LaraMichelangelo AgnelloAndre MischkeMichal MeresTiziano VirgiliF. SoramelCorrado GargiuloManoj Bhanudas JadhavAli ZamanGilda ScioliLeonid VinogradovGabor KissJohanna StachelClaude Andre PruneauAndrea DublaOleksandr KovalenkoSatoshi YanoGiuseppe TrombettaD. A. Moreira De GodoyClaudiu Cornel SchiauaS. LiRamona LeaJ. W. HarrisRoberto BarberaA. RachevskiJuan Carlos Cabanillas NorisElena BottaR. VarmaCynthia Marie HadjidakisA. Fernández TéllezL. Calero DiazLuciano MusaRicha GuptaI. E. YushmanovSaehanseul OhSebastian KlewinSandra MorettoAndrea DanuP. Ladron De GuevaraGuillaume BatignePooja PareekJanet Elizabeth SegerAndrea FrancesconE. Calvo VillarFederico AntinoriPradip Kumar SahuEvgeny KarpechevG. Aglieri RinellaAnik GuptaMeidana HuangErin Frances GaugerEugen MudnicJorn Henning PutschkeAlexander SzaboFilip KrizekBranislav SitarDario BerzanoAnju BhasinCvetan Valeriev CheshkovRadiy IlkaevGerardus NoorenJan MusinskyOmbretta PinazzaHiroki YokoyamaStefan KirschSergey NikulinAlexei KhanzadeevSilvia MasciocchiAjay Kumar DashG. Conesa BalbastrePeter Martin JacobsSidharth Kumar PrasadSilvia ArcelliH. BøggildDaniel BerenyiKenta ShigakiPremomoy GhoshJon Christopher WikneStefania BufalinoE. StenlundNatalia KondratyevaMateusz Andrzej PloskonChaosong GaoSaikat BiswasArild VelureGiacomo BrunoD. HatzifotiadouPredrag BuncicLaszlo BoldizsarJ. TakahashiKjetil UllalandN. De MarcoVolodymyr YurchenkoAntonija UtrobicicP. H. S. Y. JayarathnaPaola GianottiLukasz Kamil GraczykowskiVladimir IzucheevMarco MarquardGiuseppe SimonettiNaoto TanakaHui ZhangRalf Peter AverbeckJ. Castillo CastellanosJamila Bashir ButtY. SibiriakMarc WeberRenu BalaDavid Michael RohrMauro Rogerio CosentinoC. G. YaldoA. J. CastroIwona Anna SputowskaAndrea AliciS. BeoleC. Lagana FernandesNima ZardoshtiE. Belmont-morenoFrancesco RiggiFouad RamiIlya SelyuzhenkovPaolo MartinengoBuddhadeb BhattacharjeeD. W. KimD. PeresunkoKirill VoloshinRenaud VernetC. Klein-bösingG. A. FeofilovC. De ContiA. S. NyaninF. BelliniM. ZhalovNur HussainMaciej Pawel SzymanskiJesse Thomas BuxtonPanagiota FokaKishora NayakKilian Eberhard SchwarzMesut ArslandokAlessandro FerrettiKonstantin MikhaylovMichal SefcikFilippo CostaBoris WagnerS. L. La PointeC. GarabatosDai-mei ZhouWerner RieglerPaolo CameriniSergey VoloshinBasanta Kumar NandiSvein LindalRishat SultanovPing YangN. ZaviyalovA. Gomez RamirezHt YangAnnelies Marianne VeenVito ManzariKristin Fanebust HetlandD. MiśkowiecYves Roland SchutzViktor RiabovFabio Filippo ColamariaAnthony Robert TimminsAdam Ryszard KisielL. CunqueiroH.b. KimA. J. Rubio Montero10E. SpiritiChristian Claude KuhnJ. JadlovskyFederica SozziElena RoccoJ.-y. GrossiordT.h. KimH. AppelshäuserMohamad TarhiniKetil RøedTyler Allen BrowningOliver BuschB. ErazmusHans Peter BeckJ. Martin BlancoC. YasarStefano PianoAttiq Ur RehmanKi-seok ChoiMotoi InabaIgor PshenichnovF. CarenaCristian AndreiVenelin AnguelovEliane EppleTaku GunjiJin Hee YoonAna Maria MarinC. ZhangP. CerelloRathijit BiswasI. León MonzónJozef FerenceiJacopo MarguttiA. VyushinTome AnticicMarta VerweijPeter Zahariev HristovKen OyamaJ. Figiel116L. V. MalininaC. CicaloIouri BelikovThomas DietelMikolaj KrzewickiEwa Gladysz-dziadusJan RakRaffaele GrossoZ. YinS. BöttgerMiljenko SuljicMichael Linus KnichelMonika KofaragoDonald M. McdonaldRahul Ramachandran NairStefano TrogoloZ. ButheleziTomas VanatShuaib Ahmad KhanA. B. KurepinBeomsu ChangG. ViestiAlina Gabriela GrigorasR. BelmontC. OppedisanoTatiana DrozhzhovaJens WiechulaSalvatore AiolaYu. V. KharlovSergey NikolaevMihaela GheataF. BockRoman LietavaP. CrochetAnastasia Maria BarbanoLivio BianchiEugenio ScapparoneYou ZhouAnton AlkinGuy PaicBenjamin AudurierFederico CindoloJovan MilosevicM. EstienneSanjib MuhuriP. RoyPascal DillensegerCostin GrigorasLaura FabbiettiAnders Garritt KnospeS. MahajanL. ŠáNdorG. PudduDaiki SekihataCatalin-lucian RisteaD. VranicVitaly LoginovMihai NiculescuG. S. PappalardoP. G. KuijerMichael WangAlberto BaldisseriN. PoljakAlexandru Florin DobrinR. RomitaRaymond James EhlersSohail Musa MahmoodZixuan SongAditya Nath MishraRoberto DiviaDimitry AleksandrovS. Porteboeuf-houssaisD. S. HwangF. ScarlassaraA. FelicielloWladyslaw Henryk TrzaskaPatrick Simon ReicheltSergey NazarenkoShinichi HayashiMadalina-gabriela TarzilaSarita SahooE. Perez LezamaYvonne Chiara PachmayerChristoph BlumeAdela KravcakovaAndrzej RybickiAlberica ToiaGideon Francois SteynVit KuceraCiprian Mihai MituM. Mohisin KhanC. SøgaardEsther BartschI. BerceanuBorge Svane NielsenFrancesco NoferiniE. DénesMohd Danish AzmiH. León VargasMagnus MagerPeter ChochulaSatyajit JenaNikita AgrawalChristophe Pierre SuireMukesh SharmaPeter MalzacherG. StefanekVladimir NikulinR. OravaDaniel Michael MuhlheimVardanush PapikyanR. Alfaro MolinaR. ScottW. J. ParkPietro AntonioliJ.a. MaresMaria HaiducBoris HippolyteMarielle ChartierGyulnara EyyubovaLidia Maria GorlichKenneth Francis ReadGrazia LuparelloJan CepilaC. PettaDagmar AdamováZhuo ZhouVladimir BelyaevJ. T. BlairLuisa CifarelliRudiger HaakeKrzysztof RedlichBrigitte CheynisSami Sakari RasanenAshutosh PandeyJubin MitraO. A. GrachovPaolo BartaliniRajendra Nath PatraM. Van LeeuwenJ. H. KangAlexander BorissovX. CaiArtem ShangaraevAlexander KlugeRedmer Alexander BertensEdmundo Javier Garcia-solisSabyasachi SiddhantaK. BarthPodist KurashviliY. P. ViyogiBastian BathenS. K. PalCarsten KleinChengxin ZhaoNatasha SharmaHenrik QvigstadHannes JungG. V. MargagliottiA. SharmaMichal BrozTeodor SiemiarczukXiang ZhangGennady ZinovjevSadhana DashM. Martinez PedreiraK. SchwedaAnnalisa MastroserioDieter RøhrichJan Fiete Grosse-oetringhausM. NicassioMikhail IppolitovOleg KaravichevNatalia ZhigarevaS. De PasqualeL. Montaño ZetinaAlla MaevskayaZubayer AhammedIgor AltsybeevM. I. MartínezSeyong KimH. Bello MartinezNicole Alice MartinDmitry Mal'kevichTsunehiro KobayashiV. GrigorievG. SimatovicJohan AlmeLuciano RamelloLaszlo OlahF. ErhardtM. E. ConnorsY. Corrales MoralesUdo Wolfgang KebschullKohei TerasakiPascal DupieuxAndrea DaineseSergey FokinR. D. MajkaJ. ThäderToralf Bernhard SkaaliM. ZyzakK. ShtejerLinda VickovicSlavka JadlovskaMichael Henry OliverTorsten AltMahmut OzdemirG. Martínez GarcíaJitendra KumarDavide Francesco LodatoM. G. FleckD. FabrisYonghong ZhangIgor LakomovAlberto MasoniBenjamin DonigusBikash SinhaMohammad Ahmad SalehP. PapcunN. GrionA. B. KurepinHerve BorelHideki HamagakiP. González-zamoraChristophe FurgetJean Willy Andre CleymansVolker LindenstruthDavid Dobrigkeit ChinellatoF. RonchettiSven GotovacBruno AlessandroHelmut Oskar OeschlerZabulon VilakaziJ. Mercado PérezP. La RoccaDavid Olle Rickard SilvermyrBarbara GuerzoniAlberto CalivaS. P. SorensenH. CainesSudhir RaniwalaTatiana KaravichevaDezso VargaAndrew John LoweD. De GruttolaAnselmo MargottiPeter ChristiansenTatsuya ChujoT. PeitzmannMihai PetroviciAra GrigoryanM. VajzerSubikash ChoudhuryAlberto ColluD. EliaBernd Stefan WindelbandVarlen GrabskiEmilia LeograndeFiorella FiondaS. LeeB. Von HallerArturo Alejandro Menchaca-rochaJ. S. KimDebasish DasM. BorriD. L. D. KeijdenerRanbir SinghMandeep KourLeonardo MilanoL. AphecetcheKrzysztof Marek SielewiczJ. G. ContrerasLaure Marie MassacrierMalgorzata Anna JanikIvan VorobyevBoris TeyssierY. VinogradovL. Valencia PalomoAlessandro GrelliElisa LaudiM. CherneyMatti Mikael MieskolainenRosi ReedPrabhat Ranjan PujahariThomas Michael CormierLokesh KumarPeter StrmenAjay KumarG. De CataldoR. Cruz AlbinoSiegfried Valentin FoertschS. SchuchmannS. K. BasuM. VeldhoenAlessandra FantoniAngela BadalaHartmut HillemannsMarco LeoncinoHua PeiAnand Kumar DubeyHans Martin LjunggrenVladimir IvanovDidier AlexandreVladimir VecherninTim SchusterC. Ceballos SanchezJan PospíšilMuhammad Umair NaruXing Long LiJaime NormanG. L. UsaiPetr ZávadaSanjeev KumarKristjan Herlache GulbrandsenA. C. Oliveira Da SilvaNicola BianchiDeepika RatheeChristina MarkertPaul Christoph BätzingCharalampos KouzinopoulosJohannes Peter WesselsJ. CerkalaAlexandru BercuciAnte BilandzicMadan M. AggarwalG. HamarD. WatanabeUzma TabassamYasuo MiakeAlexis Jean-michel MasWisla CarenaMartino GagliardiPalash KhanDavide CaffarriA. Ortiz VelasquezStefano BagnascoJohannes Hendrik StillerM. V. IvanovNirbhay Kumar BeheraD. Di BariJihye SongS. EsumiM. IrfanS. U. ChungLee Stuart BarnbyPiero GiubilatoXavier Bernard LopezJaroslav BielcikElena RogochayaM. KimP. I. LoenneAnton AndronicH. J. JangBaldo SahlmullerA. De CaroJ. Van Der MaarelP. Di NezzaBharati NaikY. PestovFelix ReidtV. Chibante BarrosoRaghunath SahooValerie Ramillien BarretSerhiy SenyukovM. A. Diaz CorcheroMohammad TariqV. PetrovØYstein DjuvslandZhiqing ZhangRaphaelle Marie BailhacheErmanno VercellinI. S. ZguraM. A. MazzoniArtem KonevskikhTahir HussainDebojit SarkarPeter GlasselR. N. SingarajuChristian BourjauFrancesco BarileJoakim NystrandAntoine Xavier LardeuxJ. P. RevolA. ZaborowskaGanesh Jagannath TambaveHenner BueschingErik BrückenJ. L. CharvetDavid H. EvansRoy Crawford LemmonAndrea FestantiJana BielcikovaBjarte KilengRama Chandra BaralPeter Graham JonesSmbat GrigoryanDiego StoccoRainer Martin SchickerAndrzej DeloffJ. BookAndre AugustinusI. ErdemirMarie GermainAlice Elisabeth OhlsonR. H. MunzerAlexander VodopyanovAlexandr TumkinJeremy John WilkinsonAgneta OskarssonA. MatyjaFabian NgG. VolpeJanusz OleniaczY. BerdnikovAna VargasDanthasinghe PiyarathnaKgotlaesele SenosiMichal SumberaA. A. P. SuaideDennis Franz WeiserI. Maldonado CervantesElena BrunaM. BasileH. J. C. ZanoliF. CarnesecchiAndrei GheataSara ValleroEvgeny KryshenKlaus Johannes ReygersAstrid MorrealeTorsten DahmsI. Cortés MaldonadoM. A. TangaroRoberto PreghenellaMarek ChojnackiE. SerradillaJai Samuel Nielsen SalzwedelSupriya DasArtur FursJ. De CuvelandMassimiliano MarchisoneDeepa ThomasVladislav MankoP. RosnetBogdan VulpescuVladimir PeskovIonut Christian ArseneAndrey ReshetinSukalyan ChattopadhyayMarcello LunardonV. J. G. FeuillardI. K. YooAlexandre ShabetaiC. LaraJ. BartkePetra RiedlerM. VenaruzzoStefan Thomas HeckelAmalia PopRachid GuernaneChitrasen JenaImrich SzarkaNicole BastidAnkhi RoyBedangadas MohantyBiswarup PaulLatchezar BetevJ. J. GaardhøjeFatiha LehasH. Natal Da LuzHongbo ZhuA. Batista CamejoJeremi NiedzielaE. G. FerreiroPaolo PaganoAdrian SevcencoSonia RajputV. PetráčekRuben ShahoyanJanka VrlakovaTomoya TsujiArseniy ShabanovMyunggeun SongLucia LeardiniJurgen SchukraftChiara ZampolliSatyabrata KarVictor TrubnikovJulien FaivreXiaowen RenPanagiotis ChristakoglouG. Koyithatta MeethaleveeduPhilipp Johannes LuettigYury MelikyanOlja DordicT. P. SinhaHanna Paulina ZbroszczykT. Sugitate45Michele FlorisJongsik EumM. GallioJacobus OnderwaaterSibaji Raha

subject

Nuclear reactionPhysicsParticle physics010308 nuclear & particles physicsBranching fractionNuclear TheoryHadronGeneral Physics and AstronomyQuarkonium01 natural sciences7. Clean energyNuclear physics13. Climate action0103 physical sciencesQuark–gluon plasmaHigh Energy Physics::ExperimentRapidityImpact parameterNuclear Experiment010306 general physicsGlauber

description

We report on the first measurement of an excess in the yield of J/ψ at very low transverse momentum (pT< 0.3 GeV/c) in peripheral hadronic Pb-Pb collisions at √sNN = 2.76 TeV, performed by ALICE at the CERN LHC. Remarkably, the measured nuclear modification factor of J/ψ in the rapidity range 2.5< y< 4 reaches about 7 (2) in the pT range 0- 0.3 GeV/c in the 70-90% (50-70%) centrality class. The J/ψ production cross section associated with the observed excess is obtained under the hypothesis that coherent photoproduction of J/ψ is the underlying physics mechanism. If confirmed, the observation of J/ψ coherent photoproduction in Pb-Pb collisions at impact parameters smaller than twice the nuclear radius opens new theoretical and experimental challenges and opportunities. In particular, coherent photoproduction accompanying hadronic collisions may provide insight into the dynamics of photoproduction and nuclear reactions, as well as become a novel probe of the Quark-Gluon Plasma.

yearjournalcountryeditionlanguage
2016-06-02Physical Review Letters
https://doi.org/10.1103/physrevlett.116.222301