Universality of the Diffusion Wake from Stopped and Punch-Through Jets in Heavy-Ion Collisions

Details Universality of the Diffusion Wake from Stopped and Punch-Through Jets in Heavy-Ion Collisions Universality of the Diffusion Wake from Stopped and Punch-Through Jets in Heavy-Ion Collisions

2008-12-23

arxiv.org/abs/0812.4401v3

Phys.Rev.C79:034902,2009

Physics

Nuclear Physics

Nuclear Theory

9 pages, 6 figures, revised version, main results unchanged

Scientific paper

10.1103/PhysRevC.79.034902

We solve (3+1)-dimensional ideal hydrodynamical equations with source terms that describe punch-through and fully stopped jets in order to compare their final away-side angular correlations in a static medium. For fully stopped jets, the backreaction of the medium is described by a simple Bethe-Bloch-like model which leads to an explosive burst of energy and momentum (Bragg peak) close to the end of the jet's evolution through the medium. Surprisingly enough, we find that the medium's response and the corresponding away-side angular correlations are largely insensitive to whether the jet punches through or stops inside the medium. This result is also independent of whether momentum deposition is longitudinal (as generally occurs in pQCD energy loss models) or transverse (as the Bethe-Bloch formula implies). The existence of the diffusion wake is therefore shown to be universal to all scenarios where momentum as well as energy is deposited into the medium, which can readily be understood in ideal hydrodynamics through vorticity conservation. The particle yield coming from the strong forward moving diffusion wake that is formed in the wake of both punch-through and stopped jets largely overwhelms their weak Mach cone signal after freeze-out.

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