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arXiv · 1004.2377

Azimuthal di-hadron correlations in d+Au and Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV from STAR

STAR Collaboration·M. M. Aggarwal·Z. Ahammed·A. V. Alakhverdyants·I. Alekseev·J. Alford·B. D. Anderson·Daniel Anson·D. Arkhipkin·G. S. Averichev·J. Balewski·L. S. Barnby·S. Baumgart·D. R. Beavis·R. Bellwied·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. Calderon·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·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
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Abstract

Yields, correlation shapes, and mean transverse momenta \pt{} of charged particles associated with intermediate to high-\pt{} trigger particles ($2.5 < \pt < 10$ \GeVc) in d+Au and Au+Au collisions at $\snn=200$ GeV are presented. For associated particles at higher $\pt \gtrsim 2.5$ \GeVc, narrow correlation peaks are seen in d+Au and Au+Au, indicating that the main production mechanism is jet fragmentation. At lower associated particle $\pt < 2$ \GeVc, a large enhancement of the near- ($\dphi \sim 0$) and away-side ($\dphi \sim \pi$) associated yields is found, together with a strong broadening of the away-side azimuthal distributions in Au+Au collisions compared to d+Au measurements, suggesting that other particle production mechanisms play a role. This is further supported by the observed significant softening of the away-side associated particle yield distribution at $\dphi \sim \pi$ in central Au+Au collisions.

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STAR Collaboration, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, B. D. Anderson, Daniel Anson, D. Arkhipkin, G. S. Averichev, J. Balewski, L. S. Barnby, S. Baumgart, D. R. Beavis, R. Bellwied, 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. Calderon, 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, 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. 2010-04-14. Azimuthal di-hadron correlations in d+Au and Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV from STAR. https://doi.org/10.1103/physrevc.82.024912

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