Jet Tomography of Harmonic Fluctuations in the Initial Condition of Heavy Ion Collisions

Abstract

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 ${\chi }_n^h=v_n/{\epsilon }_n$. 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 that may provide the dominant contribution to the "hard-ridge" observed in experimental data.

7 pages, 3 figures; important updates for figures and table in version 2; some references added

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Cited by in corpus (11)

• Azimuthally fluctuating magnetic field and its impacts on observables in heavy-ion collisions
• Charge-Dependent Correlations in Relativistic Heavy Ion Collisions and the Chiral Magnetic Effect
• Event-shape fluctuations and flow correlations in ultra-relativistic heavy-ion collisions
• Enhancement of jet quenching around phase transition: result from the dynamical holographic model
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• Event-by-event azimuthal anisotropy of jet quenching in relativistic heavy ion collisions
• Initial partonic eccentricity fluctuations in a multi-phase transport model
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• The "ripples" on relativistically expanding fluid
• Jet Quenching and Correlations