J/ψ production as a function of charged particle multiplicity in pp collisions at
Betty Bezverkhny Abelev,Jaroslav Adam,D Adamova,A Adare,M M Aggarwal,G Aglieri Rinella,A G Agocs,A Agostinelli,S Aguilar Salazar,Z Ahammed,A Ahmad Masoodi,N Ahmad,S U Ahn,A Akindinov,D Aleksandrov,B Alessandro,R Alfaro Molina,A Alici,A Alkin,E Almaraz Avina,J Alme,T Alt,V Altini,S Altinpinar,I Altsybeev,C Andrei,A Andronic,V Anguelov,J Anielski,C Anson,T Anticic,F Antinori,P Antonioli,L Aphecetche,H Appelshauser,N Arbor,S Arcelli,A Arend,N Armesto,R Arnaldi,T Aronsson,I C Arsene,M Arslandok,A Asryan,A Augustinus,R Averbeck,T C Awes,J Aysto,M D Azmi,M Bach,A Badala,Y W Baek,R Bailhache,R Bala,R Baldini Ferroli,A Baldisseri,A Baldit,F Baltasar Dos Santos Pedrosa,J Ban,Rama Chandra Baral,R Barbera,Francesco Barile,Gergely Gabor Barnafoldi,L S Barnby,V Barret,J Bartke,M Basile,N Bastid,B Bathen,G Batigne,B Batyunya,C Baumann,I G Bearden,H P Beck,I Belikov,F Bellini,R Bellwied,E Belmontmoreno,Gyula Bencedi,S Beole,I Berceanu,A Bercuci,Y Berdnikov,Daniel Berenyi,Carsten Bergmann,Dario Berzano,L Betev,A Bhasin,A K Bhati, N Bianchi,L Bianchi,C Bianchin,J Bielcik,J Bielcikova,A Bilandzic,S Bjelogrlic,Francisco Pena Blanco,D Blau,C Blume,M Boccioli,Nicholas A Bock,A Bogdanov,H Boggild,M Bogolyubsky,L Boldizsar,M Bombara,J Book,H Borel,A Borissov, S C Bose,F Bossu,M Botje,S Bottger,B Boyer,P Braunmunzinger,M Bregant,T Breitner,Tyler Allen Browning,Michal Broz,R Brun,E Bruna,G Bruno,D Budnikov,H Buesching,S Bufalino,K Bugaiev,Oliver Busch,Z Buthelezi,D Caballero Orduna,D Caffarri,X Cai,H Caines,E Calvo Villar,P Camerini,V Canoa Roman,G Cara Romeo,F Carena,W Carena,N Carlin Filho,F Carminati,C A Carrillo Montoya,A Casanova Diaz,J Castillo Castellanos,J F Castillo Hernandez,Ester Anna Rita Casula,V Catanescu,C Cavicchioli,Jan Cepila,P Cerello,B Chang,S Chapeland,J L Charvet,S Chattopadhyay,M Cherney,C Cheshkov,B Cheynis,E Chiavassa,V Chibante Barroso,D D Chinellato, P Chochula,M Chojnacki,P Christakoglou,C H Christensen,P Christiansen,T Chujo,S U Chung,C Cicalo,L Cifarelli,F Cindolo,J Cleymans,F Coccetti,F Colamaria,Domenico Colella,G Conesa Balbastre,Z Conesa Del Valle,P Constantin,G Contin,J G Contreras,T M Cormier,Y Corrales Morales,P Cortese,I Cortes Maldonado,M R Cosentino,Filippo Costa,M E Cotallo,E Crescio,Philippe Crochet,E Cruz Alaniz,E Cuautle,L Cunqueiro,A Dainese,H H Dalsgaard,A Danu,Indra J Das,K Das,Dipak K Das,Sadhana Dash,Ajay Kumar Dash, S De,A De Azevedo Moregula,G O V De Barros,A De Caro,G De Cataldo,J De Cuveland,A De Falco,D De Gruttola,H Delagrange,E Del Castillo Sanchez,A Deloff,V Demanov,N De Marco,E Denes,S De Pasquale,A Deppman,G D Erasmo,R De Rooij,D Di Bari,T Dietel,C Di Giglio,S Di Liberto, A Di Mauro,P Di Nezza,R Divia,O Djuvsland,A Dobrin,T Dobrowolski,Isabel Dominguez,Benjamin Donigus,O Dordic,Olga Driga,A K Dubey,L Ducroux,P Dupieux,M R Dutta Majumdar,D Elia,D Emschermann,H Engel,H A Erdal, B Espagnon,M Estienne,S Esumi,David Evans,G Eyyubova,D Fabris,J Faivre,D Falchieri,A Fantoni,M Fasel,R Fearick,A Fedunov,D Fehlker,Linus Feldkamp,D Felea,G Feofilov,A Fernandez Tellez,R Ferretti,A Ferretti,J Figiel,M A S Figueredo,S Filchagin, D Finogeev,F M Fionda,E M Fiore,M Floris,S Foertsch,P Foka,S L Fokin,E Fragiacomo,M Fragkiadakis,U Frankenfeld,U Fuchs, C Furget,M Fusco Girard,J J Gaardhoje, M Gagliardi,A Gago,M Gallio,D R Gangadharan,P Ganoti,C Garabatos,E Garciasolis,I Garishvili,J Gerhard,M Germain,C Geuna,A Gheata,M Gheata,B Ghidini,P K Ghosh,P Gianotti,M R Girard,P Giubellino,E Gladyszdziadus,P Glassel,R Gomez,E G Ferreiro,L H Gonzaleztrueba, P Gonzalezzamora,S Gorbunov,A Goswami,S Gotovac,V Grabski,Lukasz Kamil Graczykowski,R Grajcarek,A Grelli,A Grigoras,C Grigoras,V Grigoriev,Ara Grigoryan,Smbat Grigoryan,B Grinyov,N Grion,Philippe C Gros,Jan Fiete Grosseoetringhaus,J Y Grossiord,R Grosso,F Guber,R Guernane,C Guerra Gutierrez,B Guerzoni,M Guilbaud,K Gulbrandsen,T Gunji,Anil K Gupta,Ramesh C Gupta,H H Gutbrod,Oystein Senneset Haaland,C Hadjidakis,M Haiduc,H Hamagaki,G Hamar,B H Han,L D Hanratty,A Hansen,Z Harmanova,J W Harris,M Hartig,D Hasegan,D Hatzifotiadou,A Hayrapetyan,Stefan Thomas Heckel,Markus Ansgar Heide,H Helstrup,A Herghelegiu,G Herrera Corral,N Herrmann,K F Hetland,B Hicks,P T Hille, B Hippolyte,T Horaguchi,Yoichi Hori,P Hristov,I Hřivnacova,Min Huang,S Huber,T J Humanic,Dae Sung Hwang,R Ichou,R Ilkaev,I Ilkiv,Masayuki Inaba,E Incani,Gian Michele Innocenti,P G Innocenti,M Ippolitov,M Irfan,C Ivan, Mikhail Alexeevich Ivanov,A N Ivanov,Vladimir Ivanov,Oleksii Ivanytskyi,A Jacholkowski,P Jacobs,L Jancurova,Haeng Jin Jang,S Jangal,M Janik,R Janik,P H S Y Jayarathna,S Jena,R T Jimenez Bustamante,L Jirden,P G Jones,Hyeran Jung,Woojin Jung, A Jusko,A B Kaidalov,V Kakoyan,S Kalcher,P Kaliňak,M Kalisky,T Kalliokoski,Alexander Philipp Kalweit,K Kanaki,J H Kang,V Kaplin,A Karasu Uysal,Oleg Karavichev, T Karavicheva,Evgeny Karpechev,A V Kazantsev,U Kebschull,R Keidel,Shuaib Ahmad Khan,M M Khan,Palash Khan,A Khanzadeev,Y Kharlov,Bjarte Kileng, Mugyeom Kim, Taehyo Kim,Jun Suk Kim,S H Kim,Dong Wook Kim,Bumman Kim,S Kirsch,I Kisel,Sergey Kiselev,A Kisiel,J Klay,J Klein,C Kleinbosing,M Kliemant,A Kluge,Michael Linus Knichel,A G Knospe,K Koch,M K Kohler,A Kolojvari,V Kondratiev,Natalia Kondratyeva,A Konevskikh,A Korneev,C Kottachchi Kankanamge Don,R Kour,M Kowalski,S Kox,G Koyithatta Meethaleveedu,J F Kral,I Kralik,Frederick Kramer,I Kraus,T Krawutschke,Michal Krelina,M Kretz,M Krivda,F Krizek,M Krus,Evgeny Kryshen,M Krzewicki,Y Kucheriaev,C Kuhn,P G Kuijer,Podist Kurashvili,A B Kurepin,A Kuryakin,V Kushpil,S Kushpil,H Kvaerno,M J Kweon,Y Kwon,P Ladron De Guevara,Igor Lakomov,Rune Langoy,C Lara,Antoine Xavier Lardeux,P La Rocca,C Lazzeroni,R Lea,Y Le Bornec,K S Lee,S C Lee,F Lefevre,J Lehnert,L Leistam,M Lenhardt,V Lenti,H Leon,I Leon Monzon,H Leon Vargas,Peter Levai,J Lien,R Lietava,Svein Lindal,V Lindenstruth,Christian Lippmann,M A Lisa,Lei Liu,P I Loenne,V R Loggins,Vitaly Loginov,S Lohn,D Lohner,C Loizides,Kai Krister Loo,X Lopez,E Lopez Torres,G Lovhoiden,X G Lu,P Luettig,M Lunardon,Jun Luo,G Luparello,L Luquin,C Luzzi,K Ma,Ronghua Ma,D M Madagodahettigedon,A Maevskaya,M Mager,D P Mahapatra,Antonin Maire,Mikhail Malaev,I Maldonado Cervantes,L Malinina, D Malʼkevich,P Malzacher,A Mamonov,L Manceau,L K Mangotra,V I Manko,F Manso,V Manzari,Yaxian Mao,Massimiliano Marchisone,J J Mares,G V Margagliotti,A Margotti,A Marin,C A Marin Tobon,C Markert,I Martashvili,P Martinengo,M Martinez,A Martinez Davalos,G Martinez Garcia,Y Martynov,A Mas,S Masciocchi,M Masera,Alberto Masoni,L Massacrier,M Mastromarco,A Mastroserio,Z L Matthews,A Matyja,D Mayani, Christine Mayer,Joel Anthony Mazer,M A Mazzoni,F Meddi,A Menchacarocha,J Mercado Perez,Michal Meres,Y Miake,L Milano,Jovan Milosevic,A Mischke,Aditya Nath Mishra,D Miśkowiec,Ciprian Mihai Mitu,J Mlynarz,B Mohanty,A K Mohanty,L Molnar,L Montano Zetina,M Monteno,E Montes,T Moon,M Morando,D A Moreira De Godoy,Sandra Moretto,Andreas Morsch,V Muccifora,Eugen Mudnic,Sanjib Muhuri,H Muller,M G Munhoz,L Musa,A Musso,B K Nandi,R Nania,E Nappi,C Nattrass,N P Naumov,S Navin,T K Nayak,S Nazarenko,G Nazarov,A Nedosekin,Maria Nicassio,B S Nielsen,T Niida,S Nikolaev,V Nikolic,Sergey Nikulin,Vladimir Nikulin,B S Nilsen,M S Nilsson,F Noferini,P Nomokonov,G Nooren,N Novitzky,A S Nyanin,A Nyatha,C Nygaard,J Nystrand,A Ochirov,H Oeschler,Sun Kyung Oh,Janusz Oleniacz,C Oppedisano,A Ortiz Velasquez,Giacomo Ortona,A Oskarsson,P Ostrowski,J Otwinowski,K Oyama,K Ozawa,Yvonne Chiara Pachmayer,M Pachr,Fatima Padilla,P Pagano,G Paic,F Painke,C Pajares,S Pal,A Palaha,A Palmeri,Vardanush Papikyan,G S Pappalardo,Woo Jin Park,Annika Passfeld,B Pastircak,D I Patalakha,V Paticchio,A I Pavlinov,T Pawlak,T Peitzmann,E Pereira De Oliveira Filho,D Peresunko,C E Perez Lara,E Perez Lezama,D Perini,D Perrino,W Peryt,A Pesci,V Peskov,Y Pestov,V Petracek,M Petran,M Petris,P Petrov,M Petrovici,Catia Petta,S Piano,A Piccotti,M Pikna,P Pillot,O Pinazza,L Pinsky,N Pitz,F Piuz,Danthasinghe Piyarathna,M Ploskon,J Pluta,T Pocheptsov,Sona Pochybova,P L M Podestalerma,Martin Poghosyan,K Polak,B Polichtchouk,Adrian Pop, S Porteboeufhoussais,V Pospisil,B V K S Potukuchi,Sanjay K Prasad,R Preghenella,F Prino,C Pruneau,Igor Pshenichnov,S Puchagin,G Puddu,J Pujol Teixido,A Pulvirenti,Valery Punin,M Putis,J Putschke,E Quercigh,Henrik Qvigstad,A Rachevski,A Rademakers,S Radomski,T S Raiha,J Rak,A Rakotozafindrabe,L Ramello,A Ramirez Reyes, S Raniwala,R Raniwala,Sami Sakari Rasanen,Bogdan Theodor Rascanu,Deepika Rathee,K F Read,J S Real,Krzysztof Redlich,P Reichelt,M Reicher, R Renfordt,A R Reolon,A Reshetin,F Rettig,J P Revol,K Reygers,L Riccati,R A Ricci,T Richert,M Richter,P Riedler,W Riegler,F Riggi,M Rodriguez Cahuantzi,K Roed,D Rohr,D Rohrich,Rosa Romita,F Ronchetti,P Rosnet,S Rossegger,A M Rossi,F Roukoutakis,C Roy,Philippe Roy,A J Rubio Montero,R Rui,Evgeny Ryabinkin,A Rybicki,S A Sadovsky,K Safařik,R N Sahoo,P K Sahu,Jogender Saini, Hirotoshi Sakaguchi,Shunsuke Sakai,D Sakata,C Salgado,Jai Samuel Nielsen Salzwedel,Sanjeev Singh Sambyal,V Samsonov,X Sanchez Castro,L Sandor,A Sandoval,S Sano,M Sano,R Santo,R Santoro,J Sarkamo,E Scapparone,F Scarlassara,R P Scharenberg,Claudiu Cornel Schiaua,R Schicker,C Schmidt,H R Schmidt,S Schreiner,Simone Schuchmann,J Schukraft,Y Schutz, Katrin Schwarz,K Schweda,G Scioli,E Scomparin,P A Scott,Robert A Scott,G Segato,I Selyuzhenkov,S Senyukov,Jungmin Seo,S Serci,E Serradilla,Adrian Sevcenco,I Sgura,A Shabetai,G Shabratova,R Shahoyan,N Sharma,Seema Sharma,K Shigaki,M Shimomura,K Shtejer,Y Sibiriak,M Siciliano,E Sicking,S Siddhanta,T Siemiarczuk,D Silvermyr,G Simonetti,R N Singaraju,Rajendra Singh,Subhash Singha,B C Sinha,T Sinha,B Sitar,M Sitta,T B Skaali,K Skjerdal,R Smakal,N Smirnov,R Snellings,C Sogaard,R A Soltz, Hyeongjin Son, Jk Song, Minho Song,C Soos,F Soramel,Iwona Anna Sputowska,M Spyropouloustassinaki,B Srivastava,J Stachel,Ionel Stan,G Stefanek, G F Stefanini,T Steinbeck,M Steinpreis,E Stenlund,Gideon Francois 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PHYSICS LETTERS B（2012）
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摘要
The ALICE Collaboration reports the measurement of the relative J/psi yield as a function of charged particle pseudorapidity density dN(ch)/d eta in pp collisions at root s = 7 TeV at the LHC. J/psi particles are detected for p(t) > 0, in the rapidity interval vertical bar y vertical bar < 0.9 via decay into e(+)e(-), and in the interval 2.5 < y < 4.0 via decay into mu(+)/mu(-) pairs. An approximately linear increase of the J/psi yields normalized to their event average (dN(J/psi)/dy)/(dN(J/psi)/dy) with (dN(ch)/c eta)/(dN(ch)/d eta) is observed in both rapidity ranges, where dN(ch)/d eta is measured within vertical bar eta vertical bar < 1 and p(t) > 0. In the highest multiplicity interval with (dN(ch)/d eta)(bin)) = 24.1, corresponding to four times the minimum bias multiplicity density, an enhancement relative to the minimum bias J/psi yield by a factor of about 5 at 2.5 < y <4 (8 at vertical bar y vertical bar < 0.9) is observed. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.
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