"Jet-Ridge" effect in heavy ion collisions as a back splash from stopped parton
"Jet-Ridge" effect in heavy ion collisions as a back splash from stopped parton
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发表时间：
2007-10
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通讯作者：
V.S.Pantuev
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作者：
V.S.Pantuev
我提出了一个简单的解释的“脊”在近侧喷流两粒子相关函数在RHIC重离子碰撞。这可能是一个能量停止的部分子在类液体物质中产生的累积冲击波。在与快速穿透物体相反的方向上的液体飞溅是已知的效果。在核-核碰撞中，触发器是逃逸的非相互作用部分子。伙伴部分子可以被阻挡在介质中，在阻挡部分子后面形成密度耗尽的类圆锥激波。在所提出的方案中，激波将在三个方向上移动：两个波将形成一个角度不同于φ = 3.14弧度的相关结构，通常被称为马赫锥。另一个方向与部分子停止的原始方向正好相反。脊的宽快度分布是由远侧喷流的快度摆动和系统沿束流方向沿着纵向扩展引起的。这种激波的计算是非常复杂的，但一些唯象观测值是可以解释和预测的。
I propose a simple explanation of the ``ridge'' seen in the near-side jet two-particle correlation function in heavy ion collisions at RHIC. This could be a cumulative shock wave produced in liquid-like matter by an energetic stopped parton. Splash of liquid in the direction opposite to the fast penetrating object is a known effect. In nucleus-nucleus collision the trigger is an escaped non-interacting parton. Partner parton could be stopped in the medium forming a conical-like shock wave with density depletion behind the stopped parton. In the proposed scenario shock waves will move in three directions: two waves will form a correlation structure at angles differ from phi = 3.14 radians and are usually called a Mach Cone. The other direction is exactly opposite to the original direction of stopping parton. The wide rapidity distribution of the ridge is caused by the rapidity swing of the away-side jet and longitudinal expansion of the system along the beam direction. The calculation of such a shock wave is very complicated, but some phenomenological observables could be explained and predicted.