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arXiv 0909.0191nucl-ex
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高能核碰撞中的长程快度关联和喷流产生

Long range rapidity correlations and jet production in high energy nuclear collisions

The STAR Collaboration, B. I. Abelev

摘要:

RHIC的STAR协作组系统地研究了在$\rts = 200$ GeV的d+Au和中心Au+Au碰撞中,在小方位角对间距\dphino下的高横动量带电双强子关联。与d+Au碰撞相比,在中心Au+Au中观察到具有大纵向分离\deta的对的显著相关产率。在\detano $\times$ \dphi中的相关产额分布可以被分解为在小角间距处具有与在d+Au碰撞中发现的形状类似的窄喷流状峰,以及在\dphi和\textcolor{black}{depends only weakly on} $\deta$中窄的分量,即“脊”。使用两个系统独立的分析,发现\textcolor{black}{finite ridge yield}持续触发$\pt > 6$ \GeVc,表明它与射流生产。发现组成脊的强子的横动量谱与测量范围内的体粒子产生的横动量谱($2 < \pt < 4 \GeVc$)相似。

英文摘要:

The STAR Collaboration at RHIC presents a systematic study of high transverse momentum charged di-hadron correlations at small azimuthal pair separation \dphino, in d+Au and central Au+Au collisions at $\rts = 200$ GeV. Significant correlated yield for pairs with large longitudinal separation \deta is observed in central Au+Au, in contrast to d+Au collisions. The associated yield distribution in \detano$\times$\dphi can be decomposed into a narrow jet-like peak at small angular separation which has a similar shape to that found in d+Au collisions, and a component which is narrow in \dphi and \textcolor{black}{depends only weakly on} $\deta$, the "ridge". Using two systematically independent analyses, \textcolor{black}{finite ridge yield} is found to persist for trigger $\pt > 6$ \GeVc, indicating that it is correlated with jet production. The transverse momentum spectrum of hadrons comprising the ridge is found to be similar to that of bulk particle production in the measured range ($2 < \pt < 4 \GeVc$).

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