Two-particle correlations on transverse momentum and momentum dissipation in Au–Au collisions at = 130 GeV

The STAR Collaboration, J Adams, M M Aggarwal, Z Ahammed, J Amonett, B D Anderson, M Anderson, D Arkhipkin, G S Averichev, Y Bai, J Balewski, O Barannikova, L S Barnby, J Baudot, S Bekele, V V Belaga, A Bellingeri-Laurikainen, R Bellwied, B I Bezverkhny, S Bhardwaj, A Bhasin, A K Bhati, H Bichsel, J Bielcik, J Bielcikova,L C Bland,C O Blyth,S-L Blyth,B E Bonner, M Botje,J Bouchet,A V Brandin,A Bravar, M Bystersky,R V Cadman,X Z Cai,H Caines,M Calderón de la Barca Sánchez,J Castillo, O Catu, D Cebra,Z Chajecki,P Chaloupka, S Chattopadhyay, H F Chen, J H Chen, Y Chen,J Cheng,M Cherney, A Chikanian,H A Choi,W Christie,J P Coffin,T M Cormier,M R Cosentino,J G Cramer,H J Crawford,D Das,S Das, M Daugherity,M M de Moura,T G Dedovich,M DePhillips,A A Derevschikov,L Didenko,T Dietel, P Djawotho,S M Dogra,W J Dong,X Dong,J E Draper, F Du,V B Dunin,J C Dunlop,M R Dutta Mazumdar, V Eckardt,W R Edwards,L G Efimov,V Emelianov,J Engelage,G Eppley,B Erazmus, M Estienne, P Fachini,R Fatemi, J Fedorisin, K Filimonov,P Filip,E Finch,V Fine,Y Fisyak,J Fu,C A Gagliardi, L Gaillard, J Gans,M S Ganti,V Ghazikhanian,P Ghosh,J E Gonzalez, Y G Gorbunov, H Gos, O Grebenyuk,D Grosnick,S M Guertin, K S F F Guimaraes, Y Guo, N Gupta,T D Gutierrez,B Haag,T J Hallman,A Hamed,J W Harris, W He,M Heinz,T W Henry,S Hepplemann, B Hippolyte, A Hirsch, E Hjort, G W Hoffmann,M J Horner, H Z Huang,S L Huang, E W Hughes, T J Humanic, G Igo, A Ishihara, P Jacobs,W W Jacobs,P Jakl,F Jia,H Jiang, P G Jones,E G Judd,S Kabana,K Kang, J Kapitan,M Kaplan,D Keane,A Kechechyan,V Yu Khodyrev, B C Kim, J Kiryluk,A Kisiel, E M Kislov,S R Klein, D D Koetke,T Kollegger, M Kopytine, L Kotchenda,V Kouchpil,K L Kowalik,M Kramer,P Kravtsov,V I Kravtsov, K Krueger,C Kuhn,A I Kulikov, A Kumar,A A Kuznetsov, M A C Lamont,J M Landgraf,S Lange,S LaPointe, F Laue,J Lauret,A Lebedev,R Lednicky,C-H Lee,S Lehocka,M J LeVine,C Li,Q Li, Y Li, G Lin,S J Lindenbaum, M A Lisa, F Liu, H Liu,J Liu,L Liu,Z Liu, T Ljubicic,W J Llope, H Long, R S Longacre, M Lopez-Noriega,W A Love,Y Lu,T Ludlam, D Lynn,G L Ma,J G Ma,Y G Ma, D Magestro,D P Mahapatra, R Majka,L K Mangotra, R Manweiler,S Margetis, C Markert,L Martin,H S Matis,Yu A Matulenko, C J McClain,T S McShane,Yu Melnick, A Meschanin,M L Miller,N G Minaev,S Mioduszewski, C Mironov, A Mischke, D K Mishra,J Mitchell,B Mohanty,L Molnar, C F Moore,D A Morozov,M G Munhoz, B K Nandi,C Nattrass, T K Nayak,J M Nelson,P K Netrakanti,V A Nikitin, L V Nogach, S B Nurushev,G Odyniec,A Ogawa,V Okorokov, M Oldenburg, D Olson,M Pachr, S K Pal,Y Panebratsev,S Y Panitkin,A I Pavlinov,T Pawlak,T Peitzmann,V Perevoztchikov,C Perkins, W Peryt, V A Petrov,S C Phatak,R Picha,M Planinic, J Pluta,N Poljak, N Porile,J Porter,A M Poskanzer,M Potekhin, E Potrebenikova,B V K S Potukuchi

Journal of Physics G（2007）

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摘要

Measurements of two-particle correlations on transverse momentum $p_t$ for Au-Au collisions at $\sqrt{s_{NN}} = 130$ GeV are presented. Significant large-momentum-scale correlations are observed for charged primary hadrons with $0.15 \leq p_t \leq 2$ GeV/$c$ and pseudorapidity $|\eta| \leq 1.3$. Such correlations were not observed in a similar study at lower energy and are not predicted by theoretical collision models. Their direct relation to mean-$p_t$ fluctuations measured in the same angular acceptance is demonstrated. Positive correlations are observed for pairs of particles which have large $p_t$ values while negative correlations occur for pairs in which one particle has large $p_t$ and the other has much lower $p_t$. The correlation amplitudes per final state particle increase with collision centrality. The observed correlations are consistent with a scenario in which the transverse momentum of hadrons associated with initial-stage semi-hard parton scattering is dissipated by the medium to lower $p_t$.

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关键词

au–au collisions,transverse momentum,momentum dissipation,two-particle

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