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arXiv 0706.0472nucl-ex
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sqrt(s_NN)= 200 GeV时d + Au碰撞的前向λ产生和核阻止本领

Forward Lambda Production and Nuclear Stopping Power in d + Au Collisions at sqrt(s_NN) = 200 GeV

STAR Collaboration, B. I. Abelev

摘要:

利用STAR前向时间投影室的数据,测量了sqrt(s_NN)= 200 GeV的d + Au碰撞中的Lamda和Anti-Lamda产额以及前向和后向快度(y = ± 2.75)下的斜率参数.利用d + Au系统固有的不对称性,探讨了不同过程对重子输运和粒子产生的贡献。模型计算的比较表明,重子运输的氘核一侧是一致的多次碰撞的氘核与金的参与者。在黄金侧HIJING模型不描述测量的粒子产率,而模型与初始状态的核效应和/或强子再散射。在BNL相对论重离子对撞机的能量范围内,多链模型能很好地描述d + Au碰撞中的重子净密度,模型参数与低能核碰撞参数一致.

英文摘要:

We report the measurement of Lamda and Anti-Lamda yields and inverse slope parameters in d + Au collisions at sqrt(s_NN) = 200 GeV at forward and backward rapidities (y = +- 2.75), using data from the STAR forward time projection chambers. The contributions of different processes to baryon transport and particle production are probed exploiting the inherent asymmetry of the d + Au system. Comparisons to model calculations show that the baryon transport on the deuteron side is consistent with multiple collisions of the deuteron nucleons with gold participants. On the gold side HIJING based models do not describe the measured particle yields while models with initial state nuclear effects and/or hadronic rescattering do. The multichain model can provide a good description of the net baryon density in d + Au collisions at energies available at the BNL Relativistic Heavy Ion Collider, and the derived parameters of the model agree with those from nuclear collisions at lower energies.

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