Narrowing of the Balance Function with Centrality inAu+AuCollisions atsNN=130  GeV

J R Adams ,T A Trainor,H J Crawford,N Xu,H Wieman,M A Lisa,B Erazmus,C Roy,M Lopez-Noriega,T Herston,M Calderónde La Barca Sánchez,A A Derevschikov,Y V Zanevski,A Schüttauf,J Baudot,D G Underwood,D Magestro,V Eckardt,M G Munhoz,M J Levine,R L Ray,N Gagunashvili,A Kisiel,T W Henry,J Faivre,N Schmitz,W Peryt,J Engelage,C Markert,E Potrebenikova,O V Rogachevski,S Bekele,A Cardenas,A Chikanian,W M Zhang,N Smirnov,C A Gagliardi,T Ludlam,Y Chen,J G Cramer,T Ullrich,J Fu,J C Dunlop,P Chaloupka,R Fatemi,S V Razin,P Sorensen,S Lange,A Lebedev,S R Klein,P Yepes,M Šumbera,A M Poskanzer,M B Tonjes,J Balewski,V Perevoztchikov,L Gaudichet,L Kotchenda,B Lasiuk,S W Wissink,D Cebra,E J Stephenson,P G Jones,K Filimonov,K E Shestermanov,J Pluta,A Ogawa,A I Pavlinov,V V Belaga,Y Panebratsev,T J Hallman,A Klyachko,D Flierl,S B Nurushev,C O Blyth,L S Barnby,J L Romero,J P Coffin,A N Zubarev,G Odyniec,C Whitten,N Porile,L S Schroeder,D Reichhold,R Bellwied,H Caines,S S Shimanskii,B Surrow,P Szarwas,W A Love,C Suire,F Wang,R P Scharenberg,A Boucham,S Trentalange,L Didenko,J Sandweiss,H Z Huang,M Guedon,M Heinz,M Kaneta,F Laue,M Janik,R S Longacre,S Heppelmann,R E Tribble,A E Yakutin,J W Watson,E Yamamoto,Z Milosevich,P Nevski,V Ghazikhanian,O Barannikova,A Szanto De Toledo,A H Tang,G Rai,J E Draper,V I Yurevich,A Tai,K J Foley,I M Vasilevski,V Trofimov,A Hirsch,A M Vander Molen,M Strikhanov,F Simon,S Chattopadhyay,E Sugarbaker,T S Mcshane,E G Judd,T Pawlak,C Struck,P Jacobs,G Van Buren,M Oldenburg,Z Liu,L C Bland,R Wells,M Tokarev,E Gushin,R Lednický,E Shahaliev,Y Fisyak,S J Lindenbaum,P Kravtsov,L G Efimov,H M Spinka,G Renault,P Seyboth,I Sakrejda,J M Nelson,J Schambach,A Ridiger,O Grachov,V B Dunin,V Faine,A Billmeier,C F Moore,N G Minaev,H Bichsel,L V Nogach,R Zoulkarneev,D Thein,C P Lansdell,K Krueger,G Igo,L Liu,W Christie,G Eppley,A D Kovalenko,A Bravar,S M Guertin,A Meschanin,J Porter,B D Anderson,H S Matis,H G Ritter,H Long,G S Averichev,T J M Symons,J Castillo,I Savin,M Anderson,M Kopytine,H Zhang,M Messer,B E Bonner,J M Landgraf,V M Leontiev,C Adler,D Hardtke,D Olson,F Liu,J Amonett,B Stringfellow,E Hjort,I Zborovský,D Keane,M M De Moura,E Finch,W J Llope,J Lauret,R V Cadman,K Schweda,T J Humanic,J Takahashi,J Gans,V Grigoriev,S Margetis,R Willson,M Cherney,S A Voloshin,R Witt,A Ishihara,W W Jacobs,R Stock,M Horsley,J Kiryluk,J W Harris,A Rose,H Ward,P Fachini,G D Westfall,A Stolpovsky,T Dietel,Z Ahammed,J L Klay ,F J M Geurts ,А С Константинов ,C Allgower,Alexandre Alarcon Do Passo Suaide ,C L Kunz,Yu Ivanshin ,Yu Melnick ,C Pruneau,Jin Ma ,Michael L Miller ,I Johnson,J G Reid,J Seger,В А Никитин ,Q Li,F Meißner ,Q J Liu,Bong‐Hyuk Choi ,J Berger,L M Garcia Martin ,V L Rykov ,T M Cormier,V O Tikhomirov ,M Castro,A Vasiliev ,Yu A Matulenko,J H Thomas,M Krämer ,А И Куликов ,B Norman,J T Carroll ,M Thompson,G J Kunde,D M Seliverstov ,F Retière ,M Planinić ,M A.c Lamont ,В Емелянов ,G Škoro ,T Ljubičić ,C Kuhn,J N Marx ,D Prindle,T Kollegger,B Srivastava,J T Mitchell ,В А Петров ,O Ravel,R Majka,S.e Vigdor ,S Chernenko ,A V Brandin ,S Pandey ,V Morozov,J Putschke,Raimond Snellings ,А А Кузнецов ,M M Corral,O D Tsai ,B Hippolyte,S Panitkin ,Z Xu,M Germain,J S Wood ,V Okorokov,Jie Yang ,G Rakness,J Sowiński ,D Lynn,R.kh Kutuev ,G Paić ,J Roberts ,S Salur,M Kaplan,G W Hoffmann

doi:10.1103/physrevlett.90.172301

Abstract

The balance function is a new observable based on the principle that charge is locally conserved when particles are pair produced. Balance functions have been measured for charged particle pairs and identified charged pion pairs in Au+Au collisions at the square root of SNN = 130 GeV at the Relativistic Heavy Ion Collider using STAR. Balance functions for peripheral collisions have widths consistent with model predictions based on a superposition of nucleon-nucleon scattering. Widths in central collisions are smaller, consistent with trends predicted by models incorporating late hadronization.

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