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Aguilar M, Alberti G, Alpat B, Alvino A, Ambrosi G, Andeen K, Anderhub H, Arruda L, Azzarello P, Bachlechner A, Barao F, Baret B, Barrau A, Barrin L, Bartoloni A, Basara L, Basili A, Batalha L, Bates J, Battiston R, Bazo J, Becker R, Becker U, Behlmann M, Beischer B, Berdugo J, Berges P, Bertucci B, Bigongiari G, Biland A, Bindi V, Bizzaglia S, Boella G, de Boer W, Bollweg K, Bolmont J, Borgia B, Borsini S, Boschini MJ, Boudoul G, Bourquin M, Brun P, Buénerd M, Burger J, Burger W, Cadoux F, Cai XD, Capell M, Casadei D, Casaus J, Cascioli V, Castellini G, Cernuda I, Cervelli F, Chae MJ, Chang YH, Chen AI, Chen CR, Chen H, Cheng GM, Chen HS, Cheng L, Chernoplyiokov N, Chikanian A, Choumilov E, Choutko V, Chung CH, Clark C, Clavero R, Coignet G, Commichau V, Consolandi C, Contin A, Corti C, Costado Dios MT, Coste B, Crespo D, Cui Z, Dai M, Delgado C, Della Torre S, Demirkoz B, Dennett P, Derome L, Di Falco S, Diao XH, Diago A, Djambazov L, Díaz C, von Doetinchem P, Du WJ, Dubois JM, Duperay R, Duranti M, D'Urso D, Egorov A, Eline A, Eppling FJ, Eronen T, van Es J, et alAguilar M, Alberti G, Alpat B, Alvino A, Ambrosi G, Andeen K, Anderhub H, Arruda L, Azzarello P, Bachlechner A, Barao F, Baret B, Barrau A, Barrin L, Bartoloni A, Basara L, Basili A, Batalha L, Bates J, Battiston R, Bazo J, Becker R, Becker U, Behlmann M, Beischer B, Berdugo J, Berges P, Bertucci B, Bigongiari G, Biland A, Bindi V, Bizzaglia S, Boella G, de Boer W, Bollweg K, Bolmont J, Borgia B, Borsini S, Boschini MJ, Boudoul G, Bourquin M, Brun P, Buénerd M, Burger J, Burger W, Cadoux F, Cai XD, Capell M, Casadei D, Casaus J, Cascioli V, Castellini G, Cernuda I, Cervelli F, Chae MJ, Chang YH, Chen AI, Chen CR, Chen H, Cheng GM, Chen HS, Cheng L, Chernoplyiokov N, Chikanian A, Choumilov E, Choutko V, Chung CH, Clark C, Clavero R, Coignet G, Commichau V, Consolandi C, Contin A, Corti C, Costado Dios MT, Coste B, Crespo D, Cui Z, Dai M, Delgado C, Della Torre S, Demirkoz B, Dennett P, Derome L, Di Falco S, Diao XH, Diago A, Djambazov L, Díaz C, von Doetinchem P, Du WJ, Dubois JM, Duperay R, Duranti M, D'Urso D, Egorov A, Eline A, Eppling FJ, Eronen T, van Es J, Esser H, Falvard A, Fiandrini E, Fiasson A, Finch E, Fisher P, Flood K, Foglio R, Fohey M, Fopp S, Fouque N, Galaktionov Y, Gallilee M, Gallin-Martel L, Gallucci G, García B, García J, García-López R, García-Tabares L, Gargiulo C, Gast H, Gebauer I, Gentile S, Gervasi M, Gillard W, Giovacchini F, Girard L, Goglov P, Gong J, Goy-Henningsen C, Grandi D, Graziani M, Grechko A, Gross A, Guerri I, de la Guía C, Guo KH, Habiby M, Haino S, Hauler F, He ZH, Heil M, Heilig J, Hermel R, Hofer H, Huang ZC, Hungerford W, Incagli M, Ionica M, Jacholkowska A, Jang WY, Jinchi H, Jongmanns M, Journet L, Jungermann L, Karpinski W, Kim GN, Kim KS, Kirn T, Kossakowski R, Koulemzine A, Kounina O, Kounine A, Koutsenko V, Krafczyk MS, Laudi E, Laurenti G, Lauritzen C, Lebedev A, Lee MW, Lee SC, Leluc C, León Vargas H, Lepareur V, Li JQ, Li Q, Li TX, Li W, Li ZH, Lipari P, Lin CH, Liu D, Liu H, Lomtadze T, Lu YS, Lucidi S, Lübelsmeyer K, Luo JZ, Lustermann W, Lv S, Madsen J, Majka R, Malinin A, Mañá C, Marín J, Martin T, Martínez G, Masciocchi F, Masi N, Maurin D, McInturff A, McIntyre P, Menchaca-Rocha A, Meng Q, Menichelli M, Mereu I, Millinger M, Mo DC, Molina M, Mott P, Mujunen A, Natale S, Nemeth P, Ni JQ, Nikonov N, Nozzoli F, Nunes P, Obermeier A, Oh S, Oliva A, Palmonari F, Palomares C, Paniccia M, Papi A, Park WH, Pauluzzi M, Pauss F, Pauw A, Pedreschi E, Pensotti S, Pereira R, Perrin E, Pessina G, Pierschel G, Pilo F, Piluso A, Pizzolotto C, Plyaskin V, Pochon J, Pohl M, Poireau V, Porter S, Pouxe J, Putze A, Quadrani L, Qi XN, Rancoita PG, Rapin D, Ren ZL, Ricol JS, Riihonen E, Rodríguez I, Roeser U, Rosier-Lees S, Rossi L, Rozhkov A, Rozza D, Sabellek A, Sagdeev R, Sandweiss J, Santos B, Saouter P, Sarchioni M, Schael S, Schinzel D, Schmanau M, Schwering G, Schulz von Dratzig A, Scolieri G, Seo ES, Shan BS, Shi JY, Shi YM, Siedenburg T, Siedling R, Son D, Spada F, Spinella F, Steuer M, Stiff K, Sun W, Sun WH, Sun XH, Tacconi M, Tang CP, Tang XW, Tang ZC, Tao L, Tassan-Viol J, Ting SCC, Ting SM, Titus C, Tomassetti N, Toral F, Torsti J, Tsai JR, Tutt JC, Ulbricht J, Urban T, Vagelli V, Valente E, Vannini C, Valtonen E, Vargas Trevino M, Vaurynovich S, Vecchi M, Vergain M, Verlaat B, Vescovi C, Vialle JP, Viertel G, Volpini G, Wang D, Wang NH, Wang QL, Wang RS, Wang X, Wang ZX, Wallraff W, Weng ZL, Willenbrock M, Wlochal M, Wu H, Wu KY, Wu ZS, Xiao WJ, Xie S, Xiong RQ, Xin GM, Xu NS, Xu W, Yan Q, Yang J, Yang M, Ye QH, Yi H, Yu YJ, Yu ZQ, Zeissler S, Zhang JG, Zhang Z, Zhang MM, Zheng ZM, Zhuang HL, Zhukov V, Zichichi A, Zuccon P, Zurbach C. First result from the Alpha Magnetic Spectrometer on the International Space Station: precision measurement of the positron fraction in primary cosmic rays of 0.5-350 GeV. PHYSICAL REVIEW LETTERS 2013; 110:141102. [PMID: 25166975 DOI: 10.1103/physrevlett.110.141102] [Show More Authors] [Citation(s) in RCA: 123] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Indexed: 06/03/2023]
Abstract
A precision measurement by the Alpha Magnetic Spectrometer on the International Space Station of the positron fraction in primary cosmic rays in the energy range from 0.5 to 350 GeV based on 6.8 × 10(6) positron and electron events is presented. The very accurate data show that the positron fraction is steadily increasing from 10 to ∼ 250 GeV, but, from 20 to 250 GeV, the slope decreases by an order of magnitude. The positron fraction spectrum shows no fine structure, and the positron to electron ratio shows no observable anisotropy. Together, these features show the existence of new physical phenomena.
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Aamodt K, Abelev B, Quintana AA, Adamová D, Adare AM, Aggarwal MM, Rinella GA, Agocs AG, Salazar SA, Ahammed Z, Masoodi AA, Ahmad N, Ahn SU, Akindinov A, Aleksandrov D, Alessandro B, Molina RA, Alici A, Alkin A, Aviña EA, Alt T, Altini V, Altinpinar S, Altsybeev I, Andrei C, Andronic A, Anguelov V, Anson C, Antičić T, Antinori F, Antonioli P, Aphecetche L, Appelshäuser H, Arbor N, Arcelli S, Arend A, Armesto N, Arnaldi R, Aronsson T, Arsene IC, Asryan A, Augustinus A, Averbeck R, Awes TC, Aystö J, Azmi MD, Bach M, Badalà A, Baek YW, Bagnasco S, Bailhache R, Bala R, Ferroli RB, Baldisseri A, Baldit A, Pedrosa FBDS, Bán J, Barbera R, Barile F, Barnaföldi GG, Barnby LS, Barret V, Bartke J, Basile M, Bastid N, Bathen B, Batigne G, Batyunya B, Baumann C, Bearden IG, Beck H, Belikov I, Bellini F, Bellwied R, Belmont-Moreno E, Beole S, Berceanu I, Bercuci A, Berdermann E, Berdnikov Y, Bergmann C, Betev L, Bhasin A, Bhati AK, Bianchi L, Bianchi N, Bianchin C, Bielčík J, Bielčíková J, Bilandzic A, Biolcati E, Blanc A, Blanco F, Blanco F, Blau D, Blume C, Boccioli M, Bock N, Bogdanov A, Bøggild H, et alAamodt K, Abelev B, Quintana AA, Adamová D, Adare AM, Aggarwal MM, Rinella GA, Agocs AG, Salazar SA, Ahammed Z, Masoodi AA, Ahmad N, Ahn SU, Akindinov A, Aleksandrov D, Alessandro B, Molina RA, Alici A, Alkin A, Aviña EA, Alt T, Altini V, Altinpinar S, Altsybeev I, Andrei C, Andronic A, Anguelov V, Anson C, Antičić T, Antinori F, Antonioli P, Aphecetche L, Appelshäuser H, Arbor N, Arcelli S, Arend A, Armesto N, Arnaldi R, Aronsson T, Arsene IC, Asryan A, Augustinus A, Averbeck R, Awes TC, Aystö J, Azmi MD, Bach M, Badalà A, Baek YW, Bagnasco S, Bailhache R, Bala R, Ferroli RB, Baldisseri A, Baldit A, Pedrosa FBDS, Bán J, Barbera R, Barile F, Barnaföldi GG, Barnby LS, Barret V, Bartke J, Basile M, Bastid N, Bathen B, Batigne G, Batyunya B, Baumann C, Bearden IG, Beck H, Belikov I, Bellini F, Bellwied R, Belmont-Moreno E, Beole S, Berceanu I, Bercuci A, Berdermann E, Berdnikov Y, Bergmann C, Betev L, Bhasin A, Bhati AK, Bianchi L, Bianchi N, Bianchin C, Bielčík J, Bielčíková J, Bilandzic A, Biolcati E, Blanc A, Blanco F, Blanco F, Blau D, Blume C, Boccioli M, Bock N, Bogdanov A, Bøggild H, Bogolyubsky M, Boldizsár L, Bombara M, Bombonati C, Book J, Borel H, Borissov A, Bortolin C, Bose S, Bossú F, Botje M, Böttger S, Boyer B, Braun-Munzinger P, Bravina L, Bregant M, Breitner T, Broz M, Brun R, Bruna E, Bruno GE, Budnikov D, Buesching H, Bugaiev K, Busch O, Buthelezi Z, Caffarri D, Cai X, Caines H, Villar EC, Camerini P, Canoa Roman V, Romeo GC, Carena F, Carena W, Carminati F, Díaz AC, Caselle M, Castellanos JC, Catanescu V, Cavicchioli C, Cepila J, Cerello P, Chang B, Chapeland S, Charvet JL, Chattopadhyay S, Chattopadhyay S, Cherney M, Cheshkov C, Cheynis B, Chiavassa E, Barroso VC, Chinellato DD, Chochula P, Chojnacki M, Christakoglou P, Christensen CH, Christiansen P, Chujo T, Cicalo C, Cifarelli L, Cindolo F, Cleymans J, Coccetti F, Coffin JP, Coli S, Balbastre GC, del Valle ZC, Constantin P, Contin G, Contreras JG, Cormier TM, Morales YC, Maldonado IC, Cortese P, Cosentino MR, Costa F, Cotallo ME, Crescio E, Crochet P, Cuautle E, Cunqueiro L, Erasmo GD, Dainese A, Dalsgaard HH, Danu A, Das D, Das I, Das K, Dash A, Dash S, De S, Moregula ADA, de Barros GOV, De Caro A, de Cataldo G, de Cuveland J, De Falco A, De Gruttola D, De Marco N, De Pasquale S, De Remigis R, de Rooij R, Debski PR, Sanchez EDC, Delagrange H, Mercado YD, Dellacasa G, Deloff A, Demanov V, Dénes E, Deppman A, Di Bari D, Di Giglio C, Di Liberto S, Di Mauro A, Di Nezza P, Dietel T, Divià R, Djuvsland Ø, Dobrin A, Dobrowolski T, Domínguez I, Dönigus B, Dordic O, Driga O, Dubey AK, Dubuisson J, Ducroux L, Dupieux P, Majumdar AKD, Majumdar MRD, Elia D, Emschermann D, Engel H, Erdal HA, Espagnon B, Estienne M, Esumi S, Evans D, Evrard S, Eyyubova G, Fabjan CW, Fabris D, Faivre J, Falchieri D, Fantoni A, Fasel M, Fearick R, Fedunov A, Fehlker D, Fekete V, Felea D, Feofilov G, Téllez AF, Ferretti A, Ferretti R, Figiel J, Figueredo MAS, Filchagin S, Fini R, Finogeev D, Fionda FM, Fiore EM, Floris M, Foertsch S, Foka P, Fokin S, Fragiacomo E, Fragkiadakis M, Frankenfeld U, Fuchs U, Furano F, Furget C, Girard MF, Gaardhøje JJ, Gadrat S, Gagliardi M, Gago A, Gallio M, Gangadharan DR, Ganoti P, Ganti MS, Garabatos C, Garcia-Solis E, Garishvili I, Gemme R, Gerhard J, Germain M, Geuna C, Gheata A, Gheata M, Ghidini B, Ghosh P, Gianotti P, Girard MR, Giraudo G, Giubellino P, Gladysz-Dziadus E, Glässel P, Gomez R, Ferreiro EG, Santos HG, González-Trueba LH, González-Zamora P, Gorbunov S, Gotovac S, Grabski V, Grajcarek R, Grelli A, Grigoras A, Grigoras C, Grigoriev V, Grigoryan A, Grigoryan S, Grinyov B, Grion N, Gros P, Grosse-Oetringhaus JF, Grossiord JY, Grosso R, Guber F, Guernane R, Gutierrez CG, Guerzoni B, Gulbrandsen K, Gunji T, Gupta A, Gupta R, Gutbrod H, Haaland Ø, Hadjidakis C, Haiduc M, Hamagaki H, Hamar G, Harris JW, Hartig M, Hasch D, Hasegan D, Hatzifotiadou D, Hayrapetyan A, Heide M, Heinz M, Helstrup H, Herghelegiu A, Hernández C, Corral GH, Herrmann N, Hetland KF, Hicks B, Hille PT, Hippolyte B, Horaguchi T, Hori Y, Hristov P, Hřivnáčová I, Huang M, Huber S, Humanic TJ, Hwang DS, Ichou R, Ilkaev R, Ilkiv I, Inaba M, Incani E, Innocenti GM, Innocenti PG, Ippolitov M, Irfan M, Ivan C, Ivanov A, Ivanov M, Ivanov V, Jachołkowski A, Jacobs PM, Jancurová L, Jangal S, Janik R, Jena S, Jirden L, Jones GT, Jones PG, Jovanović P, Jung H, Jung W, Jusko A, Kalcher S, Kaliňák P, Kalisky M, Kalliokoski T, Kalweit A, Kamermans R, Kanaki K, Kang E, Kang JH, Kaplin V, Karavichev O, Karavicheva T, Karpechev E, Kazantsev A, Kebschull U, Keidel R, Khan MM, Khan SA, Khanzadeev A, Kharlov Y, Kileng B, Kim DJ, Kim DS, Kim DW, Kim HN, Kim JH, Kim JS, Kim M, Kim M, Kim S, Kim SH, Kirsch S, Kisel I, Kiselev S, Kisiel A, Klay JL, Klein J, Klein-Bösing C, Kliemant M, Klovning A, Kluge A, Knichel ML, Koch K, Köhler MK, Kolevatov R, Kolojvari A, Kondratiev V, Kondratyeva N, Konevskih A, Kornaś E, Don CKK, Kour R, Kowalski M, Kox S, Meethaleveedu GK, Kozlov K, Kral J, Králik I, Kramer F, Kraus I, Krawutschke T, Kretz M, Krivda M, Krizek F, Krumbhorn D, Krus M, Kryshen E, Krzewicki M, Kucheriaev Y, Kuhn C, Kuijer PG, Kurashvili P, Kurepin A, Kurepin AB, Kuryakin A, Kushpil S, Kushpil V, Kweon MJ, Kwon Y, La Rocca P, Ladrón de Guevara P, Lafage V, Lara C, Lardeux A, Larsen DT, Lazzeroni C, Le Bornec Y, Lea R, Lee KS, Lee SC, Lefèvre F, Lehnert J, Leistam L, Lenhardt M, Lenti V, Monzón IL, Vargas HL, Lévai P, Li X, Lien J, Lietava R, Lindal S, Lindenstruth V, Lippmann C, Lisa MA, Liu L, Loenne PI, Loggins VR, Loginov V, Lohn S, Loizides C, Loo KK, Lopez X, Noriega ML, Torres EL, Løvhøiden G, Lu XG, Luettig P, Lunardon M, Luparello G, Luquin L, Luzzi C, Ma K, Ma R, Madagodahettige-Don DM, Maevskaya A, Mager M, Mahapatra DP, Maire A, Mal'Kevich D, Malaev M, Cervantes IM, Malinina L, Malzacher P, Mamonov A, Manceau L, Mangotra L, Manko V, Manso F, Manzari V, Mao Y, Mareš J, Margagliotti GV, Margotti A, Marín A, Markert C, Martashvili I, Martinengo P, Martínez MI, Davalos AM, García GM, Martynov Y, Masciocchi S, Masera M, Masoni A, Massacrier L, Mastromarco M, Mastroserio A, Matthews ZL, Matyja A, Mayani D, Mayer C, Mazza G, Mazzoni MA, Meddi F, Menchaca-Rocha A, Lorenzo PM, Menis I, Pérez JM, Meres M, Mereu P, Miake Y, Midori J, Milano L, Milosevic J, Mischke A, Miśkowiec D, Mitu C, Mlynarz J, Mohanty AK, Mohanty B, Molnar L, Zetina LM, Monteno M, Montes E, Morando M, De Godoy DAM, Moretto S, Morsch A, Muccifora V, Mudnic E, Muhuri S, Müller H, Munhoz MG, Munoz J, Musa L, Musso A, Nandi BK, Nania R, Nappi E, Nattrass C, Navach F, Navin S, Nayak TK, Nazarenko S, Nazarov G, Nedosekin A, Nendaz F, Newby J, Nicassio M, Nielsen BS, Niida T, Nikolaev S, Nikolic V, Nikulin S, Nikulin V, Nilsen BS, Nilsson MS, Noferini F, Nooren G, Novitzky N, Nyanin A, Nyatha A, Nygaard C, Nystrand J, Obayashi H, Ochirov A, Oeschler H, Oh SK, Oleniacz J, Oppedisano C, Velasquez AO, Ortona G, Oskarsson A, Ostrowski P, Otterlund I, Otwinowski J, Oyama K, Ozawa K, Pachmayer Y, Pachr M, Padilla F, Pagano P, Jayarathna SP, Paić G, Painke F, Pajares C, Pal S, Pal SK, Palaha A, Palmeri A, Pappalardo GS, Park WJ, Patalakha DI, Paticchio V, Pavlinov A, Pawlak T, Peitzmann T, Peresunko D, Lara CEP, Perini D, Perrino D, Peryt W, Pesci A, Peskov V, Pestov Y, Peters AJ, Petráček V, Petran M, Petris M, Petrov P, Petrovici M, Petta C, Piano S, Piccotti A, Pikna M, Pillot P, Pinazza O, Pinsky L, Pitz N, Piuz F, Piyarathna DB, Platt R, Płoskoń M, Pluta J, Pocheptsov T, Pochybova S, Podesta-Lerma PLM, Poghosyan MG, Polák K, Polichtchouk B, Pop A, Porteboeuf S, Pospíšil V, Potukuchi B, Prasad SK, Preghenella R, Prino F, Pruneau CA, Pshenichnov I, Puddu G, Pulvirenti A, Punin V, Putiš M, Putschke J, Quercigh E, Qvigstad H, Rachevski A, Rademakers A, Rademakers O, Radomski S, Räihä TS, Rak J, Rakotozafindrabe A, Ramello L, Reyes AR, Rammler M, Raniwala R, Raniwala S, Räsänen SS, Read KF, Real J, Redlich K, Renfordt R, Reolon AR, Reshetin A, Rettig F, Revol JP, Reygers K, Ricaud H, Riccati L, Ricci RA, Richter M, Riedler P, Riegler W, Riggi F, Cahuantzi MR, Rohr D, Röhrich D, Romita R, Ronchetti F, Rosinský P, Rosnet P, Rossegger S, Rossi A, Roukoutakis F, Rousseau S, Roy C, Roy P, Montero AJR, Rui R, Rivetti A, Rusanov I, Ryabinkin E, Rybicki A, Sadovsky S, Safařík K, Sahoo R, Sahu PK, Saini J, Saiz P, Sakai S, Sakata D, Salgado CA, Samanta T, Sambyal S, Samsonov V, Castro XS, Sándor L, Sandoval A, Sano M, Sano S, Santo R, Santoro R, Sarkamo J, Saturnini P, Scapparone E, Scarlassara F, Scharenberg RP, Schiaua C, Schicker R, Schmidt C, Schmidt HR, Schreiner S, Schuchmann S, Schukraft J, Schutz Y, Schwarz K, Schweda K, Scioli G, Scomparin E, Scott PA, Scott R, Segato G, Selyuzhenkov I, Senyukov S, Seo J, Serci S, Serradilla E, Sevcenco A, Sgura I, Shabratova G, Shahoyan R, Sharma N, Sharma S, Shigaki K, Shimomura M, Shtejer K, Sibiriak Y, Siciliano M, Sicking E, Siemiarczuk T, Silenzi A, Silvermyr D, Simonetti G, Singaraju R, Singh R, Singhal V, Sinha BC, Sinha T, Sitar B, Sitta M, Skaali TB, Skjerdal K, Smakal R, Smirnov N, Snellings R, Søgaard C, Soloviev A, Soltz R, Son H, Song J, Song M, Soos C, Soramel F, Spyropoulou-Stassinaki M, Srivastava BK, Stachel J, Stan I, Stefanek G, Stefanini G, Steinbeck T, Steinpreis M, Stenlund E, Steyn G, Stocco D, Stock R, Stokkevag CH, Stolpovskiy M, Strmen P, Suaide AAP, Vásquez MAS, Sugitate T, Suire C, Sukhorukov M, Sumbera M, Susa T, Swoboda D, Symons TJM, de Toledo AS, Szarka I, Szostak A, Tagridis C, Takahashi J, Takaki JDT, Tauro A, Tavlet M, Muñoz GT, Telesca A, Terrevoli C, Thäder J, Thomas D, Thomas JH, Tieulent R, Timmins AR, Tlusty D, Toia A, Torii H, Toscano L, Tosello F, Traczyk T, Truesdale D, Trzaska WH, Tsuji T, Tumkin A, Turrisi R, Turvey AJ, Tveter TS, Ulery J, Ullaland K, Uras A, Urbán J, Urciuoli GM, Usai GL, Vacchi A, Vajzer M, Vala M, Palomo LV, Vallero S, van der Kolk N, van Leeuwen M, Vande Vyvre P, Vannucci L, Vargas A, Varma R, Vasileiou M, Vasiliev A, Vechernin V, Veldhoen M, Venaruzzo M, Vercellin E, Vergara S, Vernekohl DC, Vernet R, Verweij M, Vickovic L, Viesti G, Vikhlyantsev O, Vilakazi Z, Baillie OV, Vinogradov A, Vinogradov L, Vinogradov Y, Virgili T, Viyogi YP, Vodopyanov A, Voloshin K, Voloshin S, Volpe G, von Haller B, Vranic D, Øvrebekk G, Vrláková J, Vulpescu B, Vyushin A, Wagner B, Wagner V, Wan R, Wang D, Wang Y, Wang Y, Watanabe K, Wessels JP, Westerhoff U, Wiechula J, Wikne J, Wilde M, Wilk A, Wilk G, Williams MCS, Windelband B, Karampatsos LX, Yang H, Yang S, Yasnopolskiy S, Yi J, Yin Z, Yokoyama H, Yoo IK, Yu W, Yuan X, Yushmanov I, Zabrodin E, Zach C, Zampolli C, Zaporozhets S, Zarochentsev A, Závada P, Zaviyalov N, Zbroszczyk H, Zelnicek P, Zenin A, Zgura I, Zhalov M, Zhang X, Zhou D, Zichichi A, Zinovjev G, Zoccarato Y, Zynovyev M. Elliptic flow of charged particles in Pb-Pb collisions at sqrt[S(NN)] = 2.76 TeV. PHYSICAL REVIEW LETTERS 2010; 105:252302. [PMID: 21231580 DOI: 10.1103/physrevlett.105.252302] [Show More Authors] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2010] [Indexed: 05/30/2023]
Abstract
We report the first measurement of charged particle elliptic flow in Pb-Pb collisions at sqrt[S(NN)] =2.76 TeV with the ALICE detector at the CERN Large Hadron Collider. The measurement is performed in the central pseudorapidity region (|η|<0.8) and transverse momentum range 0.2<p t<5.0 GeV/c. The elliptic flow signal v₂, measured using the 4-particle correlation method, averaged over transverse momentum and pseudorapidity is 0.087 ± 0.002(stat) ± 0.003(syst) in the 40%-50% centrality class. The differential elliptic flow v₂ p t reaches a maximum of 0.2 near p t =3 GeV/c. Compared to RHIC Au-Au collisions at sqrt[S(NN)] 200 GeV, the elliptic flow increases by about 30%. Some hydrodynamic model predictions which include viscous corrections are in agreement with the observed increase.
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