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arXiv · 1109.5446

Directed and elliptic flow of charged particles in Cu+Cu collisions at $\sqrt{\bm {s_{NN}}} =$ 22.4 GeV

G. Agakishiev·M. M. Aggarwal·Z. Ahammed·A. V. Alakhverdyants·I. Alekseev·J. Alford·B. D. Anderson·C. D. Anson·D. Arkhipkin·G. S. Averichev·J. Balewski·D. R. Beavis·N. K. Behera·R. Bellwied·M. J. Betancourt·R. R. Betts·A. Bhasin·A. K. Bhati·H. Bichsel·J. Bielcik·J. Bielcikova·L. C. Bland·I. G. Bordyuzhin·W. Borowski·J. Bouchet·E. Braidot·A. V. Brandin·A. Bridgeman·S. G. Brovko·E. Bruna·S. Bueltmann·I. Bunzarov·T. P. Burton·X. Z. Cai·H. Caines·M. Calderón de la Barca Sánchez·D. Cebra·R. Cendejas·M. C. Cervantes·P. Chaloupka·S. Chattopadhyay·H. F. Chen·J. H. Chen·J. Y. Chen·L. Chen·J. Cheng·M. Cherney·A. Chikanian·K. E. Choi·W. Christie·P. Chung·M. J. M. Codrington·R. Corliss·J. G. Cramer·H. J. Crawford·Cui·A. Davila Leyva·L. C. De Silva·R. R. Debbe·T. G. Dedovich·J. Deng·A. A. Derevschikov·R. Derradi de Souza·L. Didenko·P. Djawotho·S. M. Dogra·X. Dong·J. L. Drachenberg·J. E. Draper·C. M. Du·J. C. Dunlop·L. G. Efimov·M. Elnimr·J. Engelage·G. Eppley·M. Estienne·L. Eun·O. Evdokimov·R. Fatemi·J. Fedorisin·R. G. Fersch·P. Filip·E. Finch·V. Fine·Y. Fisyak·C. A. Gagliardi·D. R. Gangadharan·F. Geurts·P. Ghosh·Y. N. Gorbunov·A. Gordon·O. G. Grebenyuk·D. Grosnick·A. Gupta·S. Gupta·W. Guryn·B. Haag·O. Hajkova·A. Hamed·L-X. Han
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Abstract

This paper reports results for directed flow $v_{1}$ and elliptic flow $v_{2}$ of charged particles in Cu+Cu collisions at $\sqrt{s_{NN}}=$ 22.4 GeV at the Relativistic Heavy Ion Collider. The measurements are for the 0-60% most central collisions, using charged particles observed in the STAR detector. Our measurements extend to 22.4 GeV Cu+Cu collisions the prior observation that $v_1$ is independent of the system size at 62.4 and 200 GeV, and also extend the scaling of $v_1$ with $η/y_{\rm beam}$ to this system. The measured $v_2(p_T)$ in Cu+Cu collisions is similar for $\sqrt{s_{NN}} = 22.4-200$ GeV. We also report a comparison with results from transport model (UrQMD and AMPT) calculations. The model results do not agree quantitatively with the measured $v_1(η), v_2(p_T)$ and $v_2(η)$.

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G. Agakishiev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, B. D. Anderson, C. D. Anson, D. Arkhipkin, G. S. Averichev, J. Balewski, D. R. Beavis, N. K. Behera, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, L. C. Bland, I. G. Bordyuzhin, W. Borowski, J. Bouchet, E. Braidot, A. V. Brandin, A. Bridgeman, S. G. Brovko, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, R. Cendejas, M. C. Cervantes, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, L. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, P. Chung, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, Cui, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, J. Deng, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, C. M. Du, J. C. Dunlop, L. G. Efimov, M. Elnimr, J. Engelage, G. Eppley, M. Estienne, L. Eun, O. Evdokimov, R. Fatemi, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, F. Geurts, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. G. Grebenyuk, D. Grosnick, A. Gupta, S. Gupta, W. Guryn, B. Haag, O. Hajkova, A. Hamed, L-X. Han. 2011-12-07. Directed and elliptic flow of charged particles in Cu+Cu collisions at $\sqrt{\bm {s_{NN}}} =$ 22.4 GeV. https://doi.org/10.1103/physrevc.85.014901

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