Midrapidity Antiproton-To-Proton Ratio From Au+Au Collisions At Root S(Nn)=130 Gev

Caleb M Adler,V I Yurevich,A. Lebedev, B Srivastava,Y. Fisyak,A Schuttauf,D G Underwood,H Wieman,K. Krueger,H M Spinka,M.J. LeVine,V. Eckardt,M. Kaneta,Robert Lee Wells,S S Shimanskii,E. Hjort,P W M Jacobs,Z Milosevich,V Trofimov, W Peryt,Peter G Jones,Y. Chen,J.M. Landgraf,P. Fachini,S E Vigdor,B Norman,S. Heppelmann,J Seger,J.C. Dunlop,V.W. Leontiev,V.V. Belaga,D Reichhold,G.J. Igo, John W Harris,A. Maliszewski,M Strikhanov, Jose A Castillo,E Potrebenikova,T J M Symons,C. Kuhn,V L Rykov,D E Greiner,A Ridiger,W.S. Deng,A Yokosawa,V Perevoztchikov,J G Reid,S.R. Klein,V A Moiseenko,T A Trainor,L. Martin,E G Judd, J F Carroll,A E Yakutin,S Radomski,M Tokarev,G D Westfall,J B Roberts,K E Shestermanov,P Szarwas, D. Lynn,P. Kravtsov,L.C. Bland,J N Marx, C Roy,A Szanto De Toledo,L. Madansky,V. Ghazikhanian,N. Gagunashvili,I Sakrejda,M. Germain, J Nystrand,N Xu, T.J. Humanic, D M Moltz, N Smirnov,O V Rogachevski,Fei Wang,S A Voloshin,J.G. Cramer, L.S. Barnby,J H Thomas,S V Razin,M. Cherney,R L Ray,Z. Ahammed,N Schmitz,H. Long,J Pluta,S.P. Chernenko,C E Allgower,Aleksei A Kuznetsov,E D Platner,V S Shvetcov,T Pawlak,T. Ljubicic,M B Tonjes,I Savin,A. Kisiel,M.A.C. Lamont,Zhikun Xu,T Ullrich,M Oldenburg,T.J. Hallman, A V Brandin,M.I. Ferguson,R.S. Longacre, Manuel E Kaplan,K.J. Foley,O. Barannikova, Jianying Zhang,D Russ,G Rai,C F Moore,Yu Melnick,M M De Moura,S W Wissink,T S Mcshane,W.A. Love,Alfonso F Cardenas,S. Lange,S. Bekele, M G Munhoz,V.B. Dunin,A N Zubarev, Jacqueline A Takahashi,W.W. Jacobs,L.G. Efimov,V. Emelianov, C.L. Kunz, D Olson,S B Nurushev, E Sugarbaker, T. LeCompte,H Stroebele,Reinhard Stock,H.S. Matis,L S Schroeder, P Nevski,Mark Anderson, Qingnan Li,C.O. Blyth,J. Berger, O. Grachov,F. Laue,B.E. Bonner,G Paic,A A P Suaide, J T Mitchell, D. Cebra,N G Minaev,S Panitkin, M A Lisa, C Suire,C Whitten,G Van Buren,Yu A Matulenko,W.J. Llope, R P Scharenberg,G. Eppley,G.J. Kunde,O Ravel,J.E. Draper,J.P. Coffin,G S Mutchler,G Skoro,A N Vasiliev,R. Majka,M. Heffner,A. Klyachko,J. Grabski,V O Tikhomirov,H. Caines,H.Z. Huang,E. Gushin,A H Tang,A.S. Konstantinov, A. Hirsch, Jianrong Yang,I. Johnson, A. Chikanian,M. Horsley,S Trentalange,R.Kh. Kutuev,M. DeMello,C.P. Landsdell,G.W. Hoffmann,A M Poskanzer,C A Ogilvie,D. Flierl,F Retiere, A Meschanin,Shital K Chattopadhyay,B. Lasiuk,E J Stephenson,V. Grigoriev,Y V Zanevski,M. Kramer,L. Kotchenda,T. Herston,A C Saulys, B. Hippolyte, T Wenaus,H. Huemmler,B. Erazmus, J Sowinski,M.L. Chen,A.A. Derevschikov,Vladimir Petrov,S U Pandey,M. Janik,R Zoulkarneev,J M Nelson,J. Lamas-Valverde,A Stolpovsky, Wen Ming Zhang,O Tsai,I M Vasilevski,S.J. Lindenbaum,G Odyniec,J Porter,W Pinganaud, F J M Geurts,V B Morozov,J. Klay,A.D. Kovalenko,B Stringfellow,H Ward,B. Choi, A. Khodinov,V A Nikitin,D Prindle, D M Seliverstov,L V Nogach,Yu I Ivanshin,R. Bossingham,G. LoCurto,J. Gans,R Willson,M. Lopez-Noriega,L. Conin,T.M. Cormier,J Sandweiss,W. Christie,J Schambach,R. Bellwied, Emily Finch,L. Didenko,G.S. Averichev,Marcos A Castro,A I Pavlinov, C Pruneau,J. Balewski,Y Panebratsev,D. Hardtke,A Ogawa,M Calderon De La Barca Sanchez, R Snellings,D. Keane,S. Margetis,P Seyboth,H G Ritter,H.J. Crawford,P Yepes,A. Ishihara,A. Boucham,A M Vandermolen,A.I. Kulikov,J. Baudot,Ronald G Witt,H. Bichsel,C Struck,E Yamamoto,A Vanyashin,N Porile,J. Engelage,Kenneth J Turner,P. Leszczynski, S. Bouvier

PHYSICAL REVIEW LETTERS（2001）

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摘要

We report results on the ratio of midrapidity antiproton-to-proton yields in Au + Au collisions at roots(NN) = 130 GeV per nucleon pair as measured by the STAR experiment at RHIC. Within the rapidity and transverse momentum range of /y/ < 0.5 and 0.4 < p(i) < 1.0 GeV/c, the ratio is essentially independent of either transverse momentum or rapidity, with an average of 0.65 0.01((stat)) +/- 0.07((syst)) for minimum bias collisions. Within errors, no strong centrality dependence is observed. The results indicate that at this RHIC energy, although the p-(p) over bar pair production becomes important at midrapidity, a significant excess of baryons: over antibaryons is still present.

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关键词

qcd,sps,elementary particles,star,gold

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