Elliptic emission of K+ and π+ in 158 A·GeV Pb + Pb collisions

M M Aggarwal,A Agnihotri, Z Ahammed,A L S Angelis,V Antonenko,V Arefiev,V Astakhov,V Avdeitchikov,T C Awes,P V K S Baba,S K Badyal,A Baldine,L Barabach,C Barlag,S Bathe,B Batiounia,T Bernier,K B Bhalla,V S Bhatia,C Blume, R Bock, E M Bohne,Z Borocz,D Bucher,A Buijs,H Busching,L Carlen,V Chalyshev,Subrata Chattopadhyay,R Cherbatchev,T Chujo,A Claussen,A Das,M P Decowski,H Delagrange,V Djordjadze,P Donni,I Doubovik,S Dutt,M R Dutta Majumdar,K El Chenawi,S M Eliseev,K Enosawa,P Foka,S L Fokin,V V Frolov,M S Ganti,S Garpman,O Gavrishchuk,F J M Geurts,T K Ghosh,R Glasow, S K Gupta, B N Guskov,H A Gustafsson,H H Gutbrod,R Higuchi,I Hrivnacova,M Ippolitov,H Kalechofsky,R Kamermans,K H Kampert,K Karadjev,K Karpio,Seiya Kato,S Kees,B W Kolb,I Kosarev,I Koutcheryaev,T Krumpel,A Kugler,P Kulinich,M Kurata,K Kurita,N A Kuzmin,I Langbein,A Lebedev,Y Y Lee, H Lohner,L Luquin,D P Mahapatra,V I Manko, Maria Aldaya Martin,G Martinez,A Maximov,R Mehdiyev,G Mgebrichvili, Y Miake,D Mikhalev,Md F Mir,G C Mishra, Yoko Miyamoto,D P Morrison,B R Mohanty,D Mukhopadhyay,V Myalkovski,H Naef,B K Nandi,S K Nayak,T K Nayak,S Neumaier,A Nianine,V Nikitine, S M Nikolaev,Paul Nilsson, S Nishimura,P Nomokonov, J Nystrand,F E Obenshain, A Oskarsson,I Otterlund,M Pachr,A Parfenov,S Pavliouk, T Peitzmann,V Petracek,F Plasil,W Pinganaud,M L Purschke,B Raeven,J Rak, R Raniwala,S Raniwala,V S Ramamurthy,N K Rao,F Retiere,K Reygers,G Roland, L Rosselet,I Roufanov, C Roy,J M Rubio,H Sako,Sanjeev Singh Sambyal, R Santo, Shuichi Sato,H Schlagheck,H R Schmidt,Y Schutz,G Shabratova,T H Shah,I Sibiriak,T Siemiarczuk,D Silvermyr,B C Sinha,N Slavine,K Soderstrom,N Solomey,S P Sorensen,P W Stankus,G Stefanek,Peter Steinberg, E Stenlund,D Stuken, M Sumbera,T Svensson,M D Trivedi,A Tsvetkov,L Tykarski,J Urbahn,E C V D Pijll,N V Eijndhoven,Gerrit Jan Van Nieuwenhuizen, A Vinogradov,Y P Viyogi, A S Vodopianov,S Voros, B Wyslouch,Kazuyuki Yagi,Y Yokota,G R Young

PHYSICS LETTERS B（1999）

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摘要

An event-by-event analysis of the azimuthal angular correlation with respect to the reaction plane has been carried out for K+ and pi(+) emission near mid-rapidity in 158 A . GeV Pb + Pb collisions. In semi-central collisions, K+ mesons are found to be preferentially emitted out of the reaction plane, while pi(+) mesons are emitted in the reaction plane. The results suggest that the kaon emission is influenced by in-medium potential effects in addition to collective flow effects. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

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pb collisions,elliptic emission

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