Isolation of Flow and Nonflow Correlations by Two- and Four-Particle Cumulant Measurements of Azimuthal Harmonics in $\sqrt{s_{_{\rm NN}}} =$ 200 GeV Au+Au Collisions

N M Abdelwahab,X Zhu,H M Spinka,M J Skoby,J M Landgraf,S Heppelmann,J Seger,G Van Nieuwenhuizen,A Bhasin,Sekar Ramachandran,Jing Zhao,Z P Zhang,J R Novak,T P Burton,R A Kycia, J H Lee,B A Trzeciak,H Masui,S Y Noh,L C De Silva, R Lednicky,Kai Kang,P Kravtsov,A Sarkar,W B Schmidke, S Mioduszewski,P Chaloupka,D Mcdonald,Ik Yoo, K S Engle,Z M Li, A K Bhati, Z Ahammed,Y X Pan,T Pawlak,K Xin,N Xu,Wei Yan,A Kechechyan,Feng Ding, J M Campbell,I G Bordyuzhin,D R Gangadharan, R E Tribble,J M Nelson, J L Romero,N R Sahoo,N Poljak, D Cebra,Y Pandit,W Borowski, M A Lisa,Wenyuan Li,J Bouchet,Kwanghoon Oh,S Vokal,A V Brandin,Pradip Kumar Sahu,Y F Wu,J K Adkins,Xiaodong Li, A H Tang,J Alford,T Kollegger,C Anson,R Debbe,H F Chen,G W Hoffmann,P Filip,D P Kikola,Zhe Sun,I Kisel,Li Yi,K D Landry,F J M Geurts,Shuying Zhang,O Rusnakova,Z Ye,Y Guo,E P Sichtermann,J Schambach,D Keane, S Margetis,S G Brovko,R Derradi De Souza, M C Cervantes, J H Chen, Jingti Deng, Feng Liu,G Nigmatkulov,S K Das,M Strikhanov,Q H Xu,Lalit Kumar, G Wang,J R Stevens,A Quintero, J B Roberts, J Turnau,B Haag,S Bultmann, N Smirnov,O Evdokimov,L C Bland, M Cherney,M Planinic, C Markert,M K Mustafa, M Shao,D D Koetke,I Koralt, S Gliske,Hao Pei,T D S Stanislaus, D G Underwood,Joseph S Takahashi,W W Jacobs,L G Efimov,A Aparin,D Tlusty,P Tribedy, J Lauret,J C Dunlop, J Bielcik, Yao Sun,B Pawlik,T G Dedovich,A N Vasiliev, X L Wang,M Przybycien,X M Sun,A Schmah,J Konzer, A Hirsch,S Kabana,Saurabh Chattopadhyay,D A Morozov,O V Rogachevskiy,Zhixin Xu,S W Wissink,T S Mcshane,A A Derevschikov, M A Szelezniak,X Huang,B Stringfellow, B Mohanty,M R Girard,Xu Cui,I Sakrejda,B Surrow,A Kisiel,L Didenko,H S Matis,D J Hofman,M Calderon De La Barca Sanchez,D Solanki,Richard G Stock,P Yepes,J Porter,P Djawotho,Zheng Xiao,J Engelage,Md Nasim, B Srivastava,Y Fisyak,H Wieman, I Kulakov,H Jang,Yixiao Zhang,Chengquan Li, J W Harris,K Kauder,H Xu,Michal Simko,Z H Khan,J Fedorisin, J L Zhang,V Okorokov,W Guryn,F Videbaek,A Gibson,H Zbroszczyk,A Ohlson,I Alekseev,Hui Wang, M M Aggarwal,Peter M Huck, T J Humanic, S Salur,Feng Wang, J G Cramer,L Kotchenda,J H Thomas,C M Du,C Yang, T K Nayak,C Perkins,Wei Xie, Zuping Tang,J Rusnak,Y Zoulkarneeva,R S Longacre,M Sumbera,D Grosnick,B Di Ruzza,J S Wang,Junsheng Cheng,L Ruan,Rashidul Haque,D Arkhipkin,G Van Buren,T Ullrich,A Davila Leyva,Xiaoyi Dong,A R Timmins, E C Aschenauer, R Vertesi,K Yip,D Smirnov, H Caines,Neha B Shah,J Chwastowski,S Raniwala, A Chikanian, J Putschke, A F Kraishan,L Adamczyk,Z Chang,A Sandacz,P Sorensen,N K Pruthi,A Vossen, K Poniatowska, M Lomnitz,P V Shanmuganathan,G Agakishiev, B K Sharma, Yuhong Xu, S Gupta,O Eyser,C Dilks,A K Gupta,S Horvat,L Eun,G S Averichev,Y Panebratsev,A Kesich,G Contin,S Trentalange,M Vandenbroucke,H J Crawford,M M Mondal,O D Tsai,P Bhattarai,E G Judd,J C Webb, A Lebedev,M J M Codrington,Lx Han,K Krueger,J A Vanfossen,Q Y Shou,R Fatemi,C K Riley,N Schmitz,Ying Wang,D P Mahapatra,D R Beavis,X Luo,B S Page,E Sangaline,J E Draper,E W Oldag,E Shahaliev,C E Flores,Li Chen,T J M Symons, Yihong Yang,L V Nogach,A Ogawa,Fuxin Zhao,B Huang,S S Shi,M Tokarev,G D Westfall,L Greiner,R Varma,Y G Ma,J M Butterworth,Y H Zhu,H W Ke, B K Nandi, J Bielcikova,N Yu,Geoffrey I Webb,J Pluta,T Ljubicic,Sergio Fazio, R Bellwied,M A C Lamont, C A Gagliardi,W Q Shen,Asma Hamed,I Bunzarov,Y P Viyogi,N G Minaev,G Odyniec,Yunze Li,John Ross,P Pile,R Cendejas,W J Llope, R P Scharenberg,G Eppley, C Zhong,D N Svirida,Amit Banerjee,G Igo,L E Dunkelberger,D S Gunarathne, R Majka,D Kalinkin,X P Zhang,H Z Huang,J L Drachenberg,P Seyboth,A M Poskanzer,Han Qiu,R L Ray, R Raniwala,L K Kosarzewski, Joshua Xu,T Tarnowsky, S B Nurushev,Wangjian Zha,D L Olvitt,G M S Vasconcelos,J Sandweiss,W Christie,M Wada, G L Ma,D Garand,H G Ritter,A Roy

PHYSICS LETTERS B（2015）

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摘要

A data-driven method was applied to Au+Au collisions at root S-NN = 200 GeV made with the STAR detector at RHIC to isolate pseudorapidity distance Delta eta-dependent and Delta eta-independent correlations by using two- and four-particle azimuthal cumulant measurements. We identified a Delta eta-independent component of the correlation, which is dominated by anisotropic flow and flow fluctuations. It was also found to be independent of. within the measured range of pseudorapidity vertical bar eta vertical bar < 1. In 20-30% central Au+Au collisions, the relative flow fluctuation was found to be 34% +/- 2%(stat.) +/- 3%(sys.) for particles with transverse momentum p(T) less than 2 GeV/c. The Delta eta-dependent part, attributed to nonflow correlations, is found to be 5% +/- 2%(sys.) relative to the flow of the measured second harmonic cumulant at vertical bar Delta eta vertical bar > 0.7. (C) 2015 The Authors. Published by Elsevier B.V.

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关键词

Heavy-ion,Flow,Nonflow

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