近侧双强子关联的系统尺寸与能量依赖性
核实验
2013-05-30 v1
摘要
本文展示了来自 RHIC 上 STAR 实验的 d+Au、Cu+Cu 和 Au+Au 碰撞中，利用具有大横向动量 () 的触发粒子测得的双粒子方位角 () 和赝快度 () 关联，碰撞能量为 = 62.4 GeV 和 200 GeV。 关联被分离为喷注状分量（在 和 上均窄）和脊状分量（在 上窄但在 上宽）。这两个分量均作为碰撞中心度的函数进行研究，喷注状关联则作为触发粒子和伴随粒子 的函数进行研究。喷注状分量的行为在不同碰撞系统中表现出惊人的一致性，表明其由碎裂产生。发现喷注状关联的宽度随系统尺寸增加而增大。此前在 = 200 GeV 的 Au+Au 碰撞中观察到的脊状结构，也在 Cu+Cu 碰撞和 = 62.4 GeV 的碰撞中被发现，但在 = 62.4 GeV 时，对于相同的平均参与者数 ()，其强度显著小于 = 200 GeV 时的情况。我们将脊状结构的测量结果与模型进行了比较。
引用
@article{arxiv.1110.5800,
title = {System size and energy dependence of near-side di-hadron correlations},
author = {STAR Collaboration and G. Agakishiev and M. M. Aggarwal and Z. Ahammed and A. V. Alakhverdyants and I. Alekseev and J. Alford and B. D. Anderson and C. D. Anson and D. Arkhipkin and G. S. Averichev and J. Balewski and L. S. Barnby and D. R. Beavis and R. Bellwied and M. J. Betancourt and R. R. Betts and A. Bhasin and A. K. Bhati and H. Bichsel and J. Bielcik and J. Bielcikova and L. C. Bland and M. Bombara and I. G. Bordyuzhin and W. Borowski and J. Bouchet and E. Braidot and A. V. Brandin and S. G. Brovko and E. Bruna and S. Bueltmann and I. Bunzarov and T. P. Burton and X. Z. Cai and H. Caines and M. Calderón de la Barca Sánchez and D. Cebra and R. Cendejas and M. C. Cervantes and P. Chaloupka and S. Chattopadhyay and H. F. Chen and J. H. Chen and J. Y. Chen and L. Chen and J. Cheng and M. Cherney and A. Chikanian and W. Christie and P. Chung and M. J. M. Codrington and R. Corliss and J. G. Cramer and H. J. Crawford and X. Cui and A. Davila Leyva and L. C. De Silva and R. 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Wang and H. Wang and J. S. Wang and Q. Wang and X. L. Wang and Y. Wang and G. Webb and J. C. Webb and G. D. Westfall and C. Whitten and H. Wieman and S. W. Wissink and R. Witt and W. Witzke and Y. F. Wu and Z. Xiao and W. Xie and H. Xu and N. Xu and Q. H. Xu and W. Xu and Y. Xu and Z. Xu and L. Xue and Y. Yang and Y. Yang and P. Yepes and Y. Yi and K. Yip and I-K. Yoo and M. Zawisza and H. Zbroszczyk and W. Zhan and J. B. Zhang and S. Zhang and W. M. Zhang and X. P. Zhang and Y. Zhang and Z. P. Zhang and F. Zhao and J. Zhao and C. Zhong and X. Zhu and Y. H. Zhu and Y. Zoulkarneeva},
journal= {arXiv preprint arXiv:1110.5800},
year = {2013}
}
备注
17 pages, 14 figures, submitted to Phys. Rev. C