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arXiv · 0710.1882

"Jet-Ridge" effect in heavy ion collisions as a back splash from stopped parton

V. S. Pantuev
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Abstract

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.

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V. S. Pantuev. 2007-10-09. "Jet-Ridge" effect in heavy ion collisions as a back splash from stopped parton. https://arxiv.org/abs/0710.1882

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