Charged-to-neutral correlation at forward rapidity in Au+Au collisions at $\sqrt{s_{NN}}$=200 GeV

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

PHYSICAL REVIEW C（2015）

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摘要

Event-by-event fluctuations of the multiplicities of inclusive charged particles and photons at forward rapidity in Au + Au collisions at root s(NN) = 200 GeV have been studied. The dominant contribution to such fluctuations is expected to come from correlated production of charged and neutral pions. We search for evidence of dynamical fluctuations of different physical origins. Observables constructed out of moments of multiplicities are used as measures of fluctuations. Mixed events and model calculations are used as base lines. Results are compared to the dynamical net-charge fluctuations measured in the same acceptance. A nonzero statistically significant signal of dynamical fluctuations is observed in excess to the model prediction when charged particles and photons are measured in the same acceptance. We find that, unlike dynamical net-charge fluctuation, charge-neutral fluctuation is not dominated by correlation owing to particle decay. Results are compared to the expectations based on the generic production mechanism of pions owing to isospin symmetry, for which no significant (<1%) deviation is observed.

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关键词

correlation,rapidity,charged particle

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