Spectra of identified high-p_{T} π^{±} and p(p¯) in Cu+Cu collisions at sqrt[s_{NN}]=200 GeV

B. I. Abelev, M. M. Aggarwal, Z. Ahammed,A. V. Alakhverdyants,B. D. Anderson,D. Arkhipkin,G. S. Averichev,J. Balewski,L. S. Barnby,S. Baumgart,D. R. Beavis, R. Bellwied,F. Benedosso,M. J. Betancourt,R. R. Betts,A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova,B. Biritz,L. C. Bland,B. E. Bonner,J. Bouchet,E. Braidot,A. V. Brandin,A. Bridgeman,E. Bruna,S. Bueltmann,I. Bunzarov, T. P. Burton,X. Z. Cai,H. Caines,M. Calderón de la Barca Sánchez,O. Catu, D. Cebra,R. Cendejas,M. C. Cervantes,Z. Chajecki,P. Chaloupka,S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen,J. Cheng,M. Cherney, A. Chikanian,K. E. Choi,W. Christie,P. Chung,R. F. Clarke,M. J. M. Codrington,R. Corliss, J. G. Cramer,H. J. Crawford,D. Das,S. Dash,A. Davila Leyva,L. C. De Silva,R. R. Debbe,T. G. Dedovich,M. DePhillips,A. A. Derevschikov,R. Derradi de Souza,L. Didenko,P. Djawotho,S. M. Dogra, X. Dong, J. L. Drachenberg,J. E. Draper,J. C. Dunlop,M. R. Dutta Mazumdar,L. G. Efimov,E. Elhalhuli,M. Elnimr,J. Engelage,G. Eppley,B. Erazmus, M. Estienne,L. Eun,O. Evdokimov,P. Fachini,R. Fatemi,J. Fedorisin,R. G. Fersch,P. Filip,E. Finch,V. Fine,Y. Fisyak,C. A. Gagliardi,D. R. Gangadharan, M. S. Ganti,E. J. Garcia-Solis,A. Geromitsos,F. Geurts,V. Ghazikhanian,P. Ghosh,Y. N. Gorbunov,A. Gordon,O. Grebenyuk,D. Grosnick,B. Grube, S. M. Guertin,A. Gupta,N. Gupta,W. Guryn,B. Haag,T. J. Hallman,A. Hamed,L.-X. Han,J. W. Harris, J. P. Hays-Wehle,M. Heinz,S. Heppelmann, A. Hirsch, E. Hjort, A. M. Hoffman,G. W. Hoffmann,D. J. Hofman,R. S. Hollis,H. Z. Huang, T. J. Humanic,L. Huo, G. Igo,A. Iordanova, P. Jacobs,W. W. Jacobs,P. Jakl,C. Jena,F. Jin,C. L. Jones, P. G. Jones,J. Joseph,E. G. Judd, S. Kabana,K. Kajimoto,K. Kang,J. Kapitan,K. Kauder,D. Keane,A. Kechechyan,D. Kettler,D. P. Kikola,J. Kiryluk,A. Kisiel, S. R. Klein,A. G. Knospe,A. Kocoloski,D. D. Koetke,T. Kollegger,J. Konzer,M. Kopytine,I. Koralt,W. Korsch,L. Kotchenda,V. Kouchpil,P. Kravtsov, K. Krueger,M. Krus,L. Kumar,P. Kurnadi, M. A. C. Lamont,J. M. Landgraf,S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky,C.-H. Lee,J. H. Lee, W. Leight,M. J. LeVine,C. Li,L. Li,N. Li, W. Li,X. Li,Y. Li,Z. Li, G. Lin, S. J. Lindenbaum, M. A. Lisa, F. Liu,H. Liu, J. Liu,T. Ljubicic,W. J. Llope,R. S. Longacre,W. A. Love,Y. Lu,G. L. Ma,Y. G. Ma,D. P. Mahapatra,R. Majka,O. I. Mall,L. K. Mangotra,R. Manweiler, S. Margetis,C. Markert,H. Masui,H. S. Matis,Yu. A. Matulenko,D. McDonald,T. S. McShane, A. Meschanin,R. Milner,N. G. Minaev, S. Mioduszewski, A. Mischke,M. K. Mitrovski, B. Mohanty,M. M. Mondal,D. A. Morozov, M. G. Munhoz,B. K. Nandi,C. Nattrass,T. K. Nayak,J. M. Nelson,P. K. Netrakanti,M. J. Ng,L. V. Nogach,S. B. Nurushev, G. Odyniec,A. Ogawa,H. Okada,V. Okorokov, D. Olson,M. Pachr,B. S. Page,S. K. Pal,Y. Pandit,Y. Panebratsev,T. Pawlak, T. Peitzmann,V. Perevoztchikov,C. Perkins, W. Peryt,S. C. Phatak,P. Pile,M. Planinic,M. A. Ploskon,J. Pluta,D. Plyku,N. Poljak,A. M. Poskanzer,B. V. K. S. Potukuchi,C. B. Powell,D. Prindle, C. Pruneau,N. K. Pruthi,P. R. Pujahari, J. Putschke, R. Raniwala,S. Raniwala,R. L. Ray,R. Redwine,R. Reed,J. M. Rehberg,H. G. Ritter,J. B. Roberts,O. V. Rogachevskiy,J. L. Romero,A. Rose, C. Roy,L. Ruan,M. J. Russcher,R. Sahoo,S. Sakai,I. Sakrejda, T. Sakuma, S. Salur,J. Sandweiss,E. Sangaline,J. Schambach, R. P. Scharenberg,N. Schmitz,T. R. Schuster,J. Seele,J. Seger,I. Selyuzhenkov,P. Seyboth,E. Shahaliev, M. Shao,M. Sharma,S. S. Shi,E. P. Sichtermann,F. Simon,R. N. Singaraju,M. J. Skoby, N. Smirnov,P. Sorensen, J. Sowinski,H. M. Spinka, B. Srivastava,T. D. S. Stanislaus,D. Staszak,J. R. Stevens,R. Stock, M. Strikhanov,B. Stringfellow,A. A. P. Suaide,M. C. Suarez,N. L. Subba, M. Sumbera,X. M. Sun,Y. Sun, Z. Sun,B. Surrow,T. J. M. Symons,A. Szanto de Toledo,J. Takahashi,A. H. Tang, Z. Tang,L. H. Tarini,T. Tarnowsky,D. Thein,J. H. Thomas,J. Tian,A. R. Timmins,S. Timoshenko,D. Tlusty,M. Tokarev, T. A. Trainor,V. N. Tram,S. Trentalange, R. E. Tribble,O. D. Tsai,J. Ulery,T. Ullrich,D. G. Underwood,G. Van Buren,G. van Nieuwenhuizen,J. A. Vanfossen,R. Varma,G. M. S. Vasconcelos,A. N. Vasiliev,F. Videbaek,Y. P. Viyogi,S. Vokal,S. A. Voloshin,M. Wada,M. Walker, F. Wang, G. Wang,H. Wang,J. S. Wang,Q. Wang,X. Wang,X. L. Wang, Y. Wang,G. Webb,J. C. Webb,G. D. Westfall,C. Whitten,H. Wieman,E. Wingfield,S. W. Wissink,R. Witt,Y. Wu, W. Xie,N. Xu,Q. H. Xu,W. Xu, Y. Xu,Z. Xu,L. Xue,Y. Yang,P. Yepes,K. Yip,I.-K. Yoo,Q. Yue,M. Zawisza,H. Zbroszczyk,W. Zhan,S. Zhang,W. M. Zhang,X. P. Zhang,Y. Zhang,Z. P. Zhang, J. Zhao, C. Zhong,J. Zhou, W. Zhou, X. Zhu,Y. H. Zhu,R. Zoulkarneev,Y. Zoulkarneeva

PHYSICAL REVIEW C（2010）

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摘要

We report new results on identified (anti) proton and charged pion spectra at large transverse momenta (3 < p(T) < 10 GeV/c) from Cu + Cu collisions at root s(NN) = 200 GeV using the STAR detector at the Relativistic Heavy Ion Collider (RHIC). This study explores the system size dependence of two novel features observed at RHIC with heavy ions: the hadron suppression at high-p(T) and the anomalous baryon to meson enhancement at intermediate transverse momenta. Both phenomena could be attributed to the creation of a new form of QCD matter. The results presented here bridge the system size gap between the available pp and Au + Au data, and allow for a detailed exploration of the onset of the novel features. Comparative analysis of all available 200 GeV data indicates that the system size is a major factor determining both the magnitude of the hadron spectra suppression at large transverse momenta and the relative baryon to meson enhancement.

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关键词

quantum chromodynamics,mesons,comparative analysis,exploration,hadrons,baryons,pions

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