Mach cone induced by $\gamma$-triggered jets in high-energy heavy-ion collisions

Understand

MMedium excitation by jet shower propagation inside a quark-gluon plasma is studied within a linear Boltzmann transport and a multiphase transport model.

• Contrary to the naive expectation, it is the deflection of both the jet shower and the Mach-cone-like excitation in an expanding medium that is found to gives rise to a double-peak azimuthal particle distribution with respect to the initial jet direction.
• Such deflection is the strongest for hadron-triggered jets which are often produced close to the surface of dense medium due to trigger-bias and travel against or tangential to the radial flow.
• Without such trigger bias, the effect of deflection on $\gamma$-jet showers and their medium excitation is weaker.