Xilin Zhang, Jinfeng Liao
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.
View original:
http://arxiv.org/abs/1202.1047
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