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arXiv 1002.1641nucl-ex
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200 GeV Au + Au碰撞电荷平衡函数的纵向标度性质

Longitudinal scaling property of the charge balance function in Au + Au collisions at 200 GeV

STAR Collaboration

摘要:

我们目前的测量的电荷平衡功能,从带电粒子,不同的赝快度和横动量范围内的金+金碰撞在200 GeV使用的STAR探测器在RHIC。我们观察到平衡函数在赝快度覆盖范围[-1.3,1.3]内是助推不变的。由观测到的伪快度窗口的宽度适当地缩放的平衡函数不依赖于伪快度窗口的位置或大小。这种标度性质也适用于不同横向动量范围的粒子。此外,我们发现,平衡函数的宽度单调减小的横向动量的所有中心类。

英文摘要:

We present measurements of the charge balance function, from the charged particles, for diverse pseudorapidity and transverse momentum ranges in Au + Au collisions at 200 GeV using the STAR detector at RHIC. We observe that the balance function is boost-invariant within the pseudorapidity coverage [-1.3, 1.3]. The balance function properly scaled by the width of the observed pseudorapidity window does not depend on the position or size of the pseudorapidity window. This scaling property also holds for particles in different transverse momentum ranges. In addition, we find that the width of the balance function decreases monotonically with increasing transverse momentum for all centrality classes.

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