Study of J/\u03c8 azimuthal anisotropy at forward rapidity in Pb-Pb collisions at sqrt{s_{mathrm{NN}}}=5.02 TeV

N Bastid,A Vodopyanov,D Voscek,J Lehrbach,A Festanti,D Di Bari,D Röhrich,M Kim,F Carnesecchi,E Hellbär,R Grosso,V Grabski,E N Umaka,N Zaviyalov,T Alt,A A Capon,A Sarkar,M Agnello,A Bhasin,S V Nesbo,G Herrera Corral,P G Kuijer,A Mamonov,S P Pathak,T J Humanic,M Ogino,M Rodríguez Cahuantzi,Y Ding,C Andrei,T Richert,J Hota,N Poljak,P Karczmarczyk,M K Habib,A M Veen,J Eum,G Luparello,A Zichichi,K F Hetland,Y Berdnikov,A Kalweit,X Li,S Pisano,S A Voloshin,C Hills,V Yurchenko,M Ivanov,B A Trzeciak,A Rustamov,C D Galvan,A Pop,J Park,A Karasu Uysal,A Vinogradov,R Haake,J Bielčíková,M A Saleh,C Petta,J Lien,S Sadhu,N K Behera,P Ghosh,S Sadovsky,D Hutter,M J Kweon,G V Margagliotti,M Faggin,G Eulisse,S Kar,M Lupi,M A S Figueredo,M A Lisa,P Bartalini,M Vargyas,R Turrisi,T B Skaali,L Barioglio,R Barbera,R J Ehlers,G Feofilov,V Litichevskyi,D Sekihata,B Kileng,K Gajdosova,S Porteboeuf-Houssais,T Kollegger,B Ketzer,C Roy,A Rehman,V Samsonov,J.-P Revol,A Masoni,A Francescon,T Chujo,V Nikulin,F Colamaria,S P Rode,J Margutti,A Rotondi,J T Buxton,X Zhang,L Ducroux,D Das,Y Miake,L Pinsky,A Bercuci,G Conesa Balbastre,V Kaplin,E Meninno,A Harton,D A Moreira De Godoy,C Jena,I Vorobyev,K Garg,B Guerzoni,A Mastroserio,F M Fionda,M K Köhler,G Neskovic,V Barret,M Mukherjee,A Maevskaya,A Matyja,M Masera,C Garabatos,L Aphecetche,J Schukraft,M Šumbera,J Jadlovsky,S Lehner,A Alici,E Karpechev,M Mohisin Khan,K Shigaki,I.-K Yoo,G Wilk,D Silvermyr,S Shirinkin,M Suleymanov,R Anwar,M Bombara,R Xu,B Alessandro,A Khanzadeev,C Lippmann,D Adamová,B Sahoo,P Dupieux,R Raniwala,K M Sielewicz,N Zardoshti,A Sevcenco,V Izucheev,S Delsanto,F Meddi,J Pan,A Dobrin,L Görlich,M Marquard,L Massacrier,J Kumar,J Song,N De Marco,V Muccifora,B T Rascanu,M Colocci,E Perez Lezama,M Malaev,S Sahoo,P Závada,R Lavicka,S Kiselev,L O D L Pimentel,J Pluta,M Fasel,B Paul,M Wang,H Bhatt,P Gasik,M A Mazzoni,F P A Damas,S A Khan,E J Kim,N Zhigareva,M Vala,I Sputowska,A K Duggal,M Šefčík,F Grosa,D Evans,P Vande Vyvre,G Trombetta,A Shabanov,B Windelband,N Bianchi,E Bruna,A Tauro,J Otwinowski,B S Nielsen,V Kučera,D Budnikov,R Shahoyan,L Cunqueiro,A Kisiel,A M Whitehead,H Hushnud,M Oravec,C Blume,C Kobdaj,P Cortese,S Raniwala,V Punin,S Rajput,K Redlich,V Vechernin,S Moretto,Z Vilakazi,F Herrmann,F Soramel,R C Lemmon,W E Witt,C Grigoras,E Rogochaya,E Kondratyuk,B Polichtchouk,B Hohlweger,J Kim,J Adolfsson,T Gunji,M Zhalov,M Jin,Y Kharlov,S Raha,F Ronchetti,A Kurepin,B Hippolyte,G Tejeda Muñoz,L Musa,L Feldkamp,A Villatoro Tello,S Senyukov,P Kurashvili,P Giubilato,A Bianchi,V Ivanov,D Caffarri,U Fuchs,A Kravčáková,D Mal’Kevich,M Krivda,M Van Leeuwen,J Viinikainen,K Schwarz,H A Andrews,B Espagnon,F Costa,J Stachel,L Greiner,A Baldisseri,C Zampolli,O Dordic,M Mazzilli,A Toia,Z Conesa Del Valle,P Huhn,M L Knichel,F Roukoutakis,J L Klay,M Pikna,F Manso,A Danu,M Vasileiou,R Gupta,J Castillo Castellanos,S Nikulin,J Sochan,B Cheynis,A Grelli,R Averbeck,P Martinengo,M G Munhoz,T M Cormier,A Gupta,A Dubla,M Floris,T Dahms,S Parmar,F Scarlassara,N Sarkar,D Domenicis Gimenez,S Nikolaev,A Zarochentsev,R Schicker,H Zbroszczyk,A Dainese,J Bhom,L A P Moreno,T Antičić,P Pillot,P Crochet,C Bedda,L Vermunt,M Jercic,M G Poghosyan,W J Llope,I Králik,S Khan,G Paić,H Caines,M B Gay Ducati,L Altenkamper,R Sultanov,D Varga,E López Torres,A Bolozdynya,A R Timmins,A Akindinov,T Chowdhury,I Pshenichnov,Z Buthelezi,K Yamakawa,H Kim,J Kvapil,J S Kim,S Chapeland,V Grigoriev,N Tanaka,I Kisel,S Gorbunov,K Suzuki,B Kim,P Luettig,J W Van Hoorne,N Valle,G Volpe,N Topilskaya,H Natal Da Luz,E Ryabinkin,F Reidt,M Sharma,S Kundu,W Carena,R Nayak,S Filchagin,R Singaraju,F Prino,M Angeletti,R Nania,C M Mitu,S Siddhanta,R Hannigan,A Lardeux,O Pinazza,R Rath,R Orava,A Alkin,J L Martinez,C Markert,L Fabbietti,R Sahoo,C Oppedisano,D Thakur,J Niedziela,J Zhu,D Blau,N Sharma,M Guittiere,S Chattopadhyay,O Villalobos Baillie,B Lim,A Grigoryan,A Tikhonov,G Simonetti,M A Völkl,F Sozzi,E Bartsch,P Sahoo,P Christiansen,P Larionov,C Schiaua,S Hayashi,D Horak,J Mitra,G Boca,J L Bazo Alba,P Gianotti,M Martinez Pedreira,A Songmoolnak,A Collu,S Bagnasco,D L D Keijdener,T Tsuji,T Kim,S Murray,E Masson,J M Gronefeld,P Sarma,S Cho,J Rak,A Rakotozafindrabe,P C Batzing,P Dhankher,J Klein,S Yano,G G Barnaföldi,K Røed,G Bonomi,E Scapparone,D De Gruttola,M Tarhini,C Hadjidakis,J Nystrand,M Concas,R Preghenella,D Pagano,V Vislavicius,S Fokin,S Saarinen,H Zhu,S Kirsch,R Alfaro Molina,B Jacak,S Grigoryan,L Micheletti,V Anguelov,I C Arsene,M G Târzilă ,N Mohammadi,S U Chung,Z Ahammed,Luis Gustavo Pereira ,X L Li,I G Bearden,F Riggi,S Piano,H M Ljunggren,M Krüger,Ashutosh Dash ,M Nicassio,Y Watanabe,Sanjeev Kumar ,B Wagner,I Selyuzhenkov,Jonghun Yoon ,M Ippolitov,T Hussain,K Šafařı́k ,M Shimomura,R Arnaldi,E Fragiacomo,D B Piyarathna,E Botta,K Gulbrandsen,C Pruneau ,P Rosnet,M C S Williams,L Leardini,A Castro ,R Bellwied,Jens Robert Luhder ,B Von Haller,M B Jadhav,N Apadula,S Lindal,G Bencédi ,V Papikyan,H Pereira Da Costa,Z Yin,A Ohlson,O Karavichev,A I Sheikh,J De Cuveland,Mike Henry Petrus Sas ,Y Melikyan,J Saini,A Margotti,E Mudnić ,Solangel Rojas Torres ,A C Oliveira Da Silva,G Batigne,H R Schmidt,J P Wessels,E Kryshen,G L Usai,B Di Ruzza,G Aglieri Rinella,J Crkovská,L Malinina,D Elia,T Virgili,L G E Beltran,B Teyssier,J J Gaardhøje,P Sett,K Kindra,K Mikhaylov,H Murakami,Z Khabanova,I Altsybeev,A Fernández Téllez,T K Nayak,Robert Helmut Münzer ,U Kebschull,C Furget,A G Knospe,C Terrevoli,A Maire,E Laudi,S Panebianco,F Thoresen,M Kofarago,N Van Der Kolk,P Bunčić ,M R Cosentino,M Fusco Girard,M Krzewicki,P Pareek,Tomasz Piotr Trzciński ,R Varma,J Vrláková,L Ramello,S Vergara Limón,R Ilkaev,H Hamagaki,P Dillenseger,D Vranić ,T E Hilden,P Ganoti,Miguel Ignacio Arratia Munoz ,X Lopez,Horst Sebastian Scheid ,J Mareš,C Klein,Y Zhu,A Gómez Ramírez ,A Narayan,J Onderwaater,Qasim Waheed Malik ,Y Corrales Morales,Jasper Elias Parkkila ,E Brücken ,D Thomas,Sandro Christian Wenzel ,S Nazarenko,S Trogolo,K Schweda,O Jevons,X Ren,Magnus Rentsch Ersdal ,Chun-Lu Huang ,B Rumyantsev,A S Sharma ,S W Lindsay,A Rossi,Christoph Mayer ,J Wiechuła ,Przemyslaw Stefan Rokita ,J Wilkinson,C Schmidt,M Mager,L K Graczykowski,P F T Matuoka ,Lee Stuart Barnby ,H M Alfanda ,Emma González Hernández ,A De ,D Finogeev,A Wegrzynek,P Braun‐Munzinger ,S Muhuri,E Willsher,R Lietava,E Calvo Villar,I Stan,J Cabala,Z Zhou,M Schmidt,C Soncco,P Malzacher,C Ristea,D Aleksandrov,J Faivre,K Puranapanda,C Deplano,T Siemiarczuk,J Seger ,R Vértesi,C Cheshkov,V Zherebchevskii,S Pochybová ,V Ratza,A M Mathis,Y Sekiguchi,Marco Toppi ,U Frankenfeld,Y Mao,Justin Thomas Blair ,H Hassan,I R Bhat,M Šuljić ,W H Trzaska,J Putschke,Mustafa Anaam ,R A Bertens,P Lončar ,G Scioli,D Hatzifotiadou,A Furs,M Al-Turany,Sk Noor Alam ,O Kovalenko,B Schaefer,M Martı́nez ,R Rui,Rajendra Nath Patra ,Alexander Kluge ,D D Chinellato,T Sugitate,T Karavicheva,S Kim,B Batyunya,P Kaliňák ,P Hristov,A Mischke,S Klewin,M Płoskoń ,B Naik,S Bufalino,V Zaccolo,G Nooren,M Kowalski,Yue Shi Lai ,S Mhlanga,R Guernane,H Oh,G De Cataldo,Y Ali,A Vargas,Y Kwon,S Evdokimov,A Fantoni,D Berényi ,V Belyaev,C Ceballos Sànchez ,J Wikne,S Foertsch,A Shangaraev,D Colella,D J Kim,J C C Noris,P Reichelt,T S Tveter,Omar Vázquez Rueda ,N Smirnov,P Foka,M Chartier,B Bhattacharjee,A Augustinus,H Borel,S Chandra,M Bonora,T W Snellman,S Costanza,A Vasiliev,F Barile,S De Pasquale,K Rosłon ,R Singh,A A P Suaide,S Sumowidagdo,A Liu,C De Conti,D M Goméz Coral,A Herghelegiu,A P Mohanty ,P González-Zamora,K Münning,K Ullaland,D S D Albuquerque,C Jahnke,S Sakai,A Harlenderova,L Betev,Lukas Nellen ,R Tieulent,H Hillemanns,N Hussain,A Khatun,M D Azmi,M Gagliardi,S Yalcin,S Swain,P Camerini,V Loginov,K Nayak,A Konevskikh,M Puccio,C Bourjau,G Bruno ,X Peng,G Simatovic,E Cuautle,P Chochula,C Kuhn,R Bala,M Marchisone,R Majka ,R A Negrao De Oliveira,S De,G Bíró ,D Kim,F Lehas,A Tumkin,P Strmeň ,D Stocco,G Fiorenza,B Erazmus,A Bøgdanov ,V Pacik,R Hosokawa,S Gotovac,M Słupecki ,M Weber,G Hamar,M B Zimmermann,C Suire,F Křížek ,Monika Joanna Jakubowska ,S Thakur,P La Rocca,R Divià,K Voloshin,P Roy,A Khuntia,J Oleniacz,L Bianchi,S Lee,F Flor,T A Broker,Sushanta Tripathy ,J C Hamon,U Tabassam,A Deisting,R Rogalev,L Koska,Dukhishyam Mallick ,A Deloff,J Ghosh,D Berzano,P Riedler,N Kondratyeva,S Dudi,M Sitta,H Yokoyama,M H Oliver ,H Buesching,P Palni,Guido Alexander Willems ,I Belikov,H Pei,A Feliciello,I Léon Monźon ,F Erhardt,Ganesh Jagannath Tambave ,R Langoy,E Nappi,Z Zhang,E A R Casula,A Borissov,Anastasia Maria Barbano ,J Takahashi,Victor Jose Gaston Feuillard ,Piotr Jan Konopka ,Matthias Richter ,E Stenlund,N A Martin,S Biswas,A Jusko,M Ball,A Khan ,P Nomokonov,M Janik ,Y Pestov,S Kushpil,A Di Mauro,T Peitzmann,D F Lodato,L Kumar,A Telesca,A De Falco,B K Nandi,S Hornung,V Chibante Barroso,M Meres,A Passfeld,A Menchaca‐Rocha ,Partha Pratim Bhaduri ,C.j Myers ,A M Kubera,M U Naru,R T Jimenez Bustamante,Adrian Fereydon Nassirpour ,Y Sibiriak,C Loizides,Joon Ho Kang ,J Norman,P Lévai,P L.m Podesta-Lerma ,J P Iddon,D Røhr ,S Beolè ,V Trubnikov,J D Mulligan,I Lakomov,Aditya Nath Mishra ,A Caliva,S Arcelli,Raúl Arteche Díaz ,T Sinha,J Butt ,J F Grosse-Oetringhaus,J Bielčík,M Germain,F Noferini,Soren Pontoppidan Sorensen ,P G Jones,P K Sahu,K Barth,D F Weiser,Nicolas Schmidt ,H Engel,Y Zhang,K Lapidus,Sumit Kumar Saha ,A Shabetai,F Cindolo,Erin Frances Gauger ,A.b Kurepin ,C Anson,R Keidel,M Lunardon,A Morreale,K L Graham,S Dani,P Bühler ,M Broz,M R Haque,R Bailhache,O Busch,A Morsch,S R Navarro,S Aiola,I B Guzman,S Jaelani,D Mühlheim,Ø Djuvsland,U Westerhoff,B Sitár ,V Manzari,J G Contreras,L Kreis,V González ,Q Y Shou ,M Hamid,P Jacobs ,W Poonsawat,Y W Baek,Hermann Franz Degenhardt ,A Chauvin,P Glässel,Raimond Snellings ,L Bratrud,M Gallio,B Chang,Sang Un Ahn ,A Ortiz Velasquez,Y Zhou,J W Harris,V Peskov,V Manko,Rabi Soto Camacho ,P Antonioli,A Francisco,Henrique José Correia Zanoli ,A Öskarsson ,K Reygers,Edgar Dominguez Rosas ,W Riegler,E Endress,V Lindenstruth,H Bello Martínez ,M Konyushikhin,J Figiel,Maksim Melnik Storetvedt ,G G Fronzé ,A Zaman,R Renfordt,W Shaikh,R Vernet,A Adler,E García-Solis ,S Acharya,Haavard Helstrup ,S G Weber,K Oyama,A K Dubey,G Zinovjev,M Keil,A Bilandzic,M Inaba,P Giubellino,E Serradilla,P Christakoglou,E Scomparin,A Uras,L Tropp,R Nair,F Pliquett,S Basu,A Rybicki,I Das,Sami Sakari Rasanen ,I Ravasenga,Rafael Peretti Pezzi ,F Ng,F Rami,M Petrovici,A Andronic,M Planinić ,L Cifarelli,C Cicalò ,A Utrobicic,C Nattrass,N Jacazio,D Sarkar,L Valencia Palomo,V Petráček,Y Pachmayer,H Beck,M M Aggarwal,O Vázquez Doce,E Epple,F Bock,Shamik Ghosh ,Meike Charlotte Danisch ,C Hughes,A Nyanin,A Szabó ,P W Stankus ,S Dash,A Reshetin,V Riabov,J Alme,T Mrnjavac,J Zmeskal,V Pozdniakov,C H Christensen,M Bregant,Ashok Kumar Pandey ,V Singhal,B Dönigus,E Vercellin,M S Islam,Dae Sung Hwang ,T Dietel,Dimitar Lubomirov Mihaylov ,C Zhao,A Maŕın ,M M Kielbowicz,M M Mieskolainen,C Klein-Bösing,A Badalá ,S M Mahmood,S 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doi:10.1007/jhep02(2019)012

Abstract

The second (v2) and third (v3) flow harmonic coefficients of J/ψ mesons are measured at forward rapidity (2.5 < y < 4.0) in Pb-Pb collisions at sqrt{s_{mathrm{NN}}}=5.02 TeV with the ALICE detector at the LHC. Results are obtained with the scalar product method and reported as a function of transverse momentum, pT, for various collision centralities. A positive value of J/ψ v3 is observed with 3.7σ significance. The measurements, compared to those of prompt D0 mesons and charged particles at mid-rapidity, indicate an ordering with vn(J/ψ) < vn(D0) < vn(h±) (n = 2, 3) at low and intermediate pT up to 6 GeV/c and a convergence with v2(J/ψ) ≈ v2(D0) ≈ v2(h±) at high pT above 6–8 GeV/c. In semi-central collisions (5–40% and 10–50% centrality intervals) at intermediate pT between 2 and 6 GeV/c, the ratio v3/v2 of J/ψ mesons is found to be significantly lower (4.6σ) with respect to that of charged particles. In addition, the comparison to the prompt D0-meson ratio in the same pT interval suggests an ordering similar to that of the v2 and v3 coefficients. The J/ψ v2 coefficient is further studied using the Event Shape Engineering technique. The obtained results are found to be compatible with the expected variations of the eccentricity of the initial-state geometry.

Highlights

IntroductionCentral Pb-Pb collisions at the center of mass energy per nucleon pair of sNN = 5.02 TeV indicates a significant positive v2 coefficient [19]
Recent measurements of D-meson azimuthal asymmetry in Pb-Pb collisions are interpreted as collective behavior of the charm quarks at low pT and path-length dependent charm-quark energy loss at high pT [23, 24]
Such an observation suggests that, at high pT, the azimuthal asymmetry of the J/ψ mesons as well as that of charged particles and prompt D0 mesons is possibly governed by in-medium path-length dependent energy-loss effects

Summary

Introduction

Central Pb-Pb collisions at the center of mass energy per nucleon pair of sNN = 5.02 TeV indicates a significant positive v2 coefficient [19] This result is compatible with the hypothesis of J/ψ production via recombination of thermalized c andc quarks from the QGP medium predominantly at low pT, but the magnitude and the transverse momentum dependence of the v2 coefficient differ significantly from theoretical calculations [12,13,14]. Recent measurements of D-meson azimuthal asymmetry in Pb-Pb collisions are interpreted as collective behavior of the charm quarks at low pT and path-length dependent charm-quark energy loss at high pT [23, 24]. At high pT above 6–8 GeV/c, the observed azimuthal anisotropy of the final-state particles is believed to come from path-length dependent parton energy loss inside the QGP.

Methods

Results

Conclusion