Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2012-02-06
Physics
Nuclear Physics
Nuclear Theory
7 pages, 3 figures
Scientific paper
In this paper we study the jet response (particularly azimuthal anisotropy) as a hard probe of the harmonic fluctuations in the initial condition of central heavy ion collisions. By implementing the fluctuations via cumulant expansion for various harmonics quantified by $\epsilon_n$ and using the geometric model for jet energy loss, we compute the response $\chi^h_n=v_n/\epsilon_n$. Combining these results with the known hydrodynamic response of the bulk matter expansion in the literature, we show that the hard-soft azimuthal correlation arising from their respective responses to the common geometric fluctuations reveals a robust and narrow near-side peak which may be the explanation of the "hard-ridge" observed in experimental data.
Liao Jinfeng
Zhang Xilin
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