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New Method of Jet Quenching Established by CCNU

Revision:Xiao Yao; Hu QiaoqiaoDate:2020/10/04

A drunk man named Quark is walking along a sloping dam randomly. Although his initial direction is along the dam, he will finally reach the bottom of the dam because of the slope (gradient). In the experiment of heavy-ion collisions. The transports of high-energy quarks in heterogeneous dense medium are similar to the behavior of the drunk man. The Particle Physics Laboratory in the College of Physical Science and Technology of CCNU and Lawrence Berkeley National Laboratory established a new method to study the properties of dense matter based on the phenomenon of the drunk man’s behavior. The research results were published on latest Physical Review Letters. ( The authors of the paper are Yayun He and Longgang Pang. Yayun He is a graduate student of Physics in CCNU and this is his second article on that he published on Physical Review Letters during his PhD.

Transverse momentum broadening and the energy loss of propagating partons are dictated by the space-time profile of the jet transport coefficient ^q in dense QCD medium. The spatial gradient of ^q perpendicular to the propagation direction can lead to a drift and asymmetry in partons transverse momentum distribution. Such an asymmetry depends on both the spatial position along the transverse gradient and the path length of a propagating partons as shown by numerical solutions of the Boltzmann transport in the simplified form of a drift-diffusion equation. In high-energy heavy-ion collisions, this asymmetry with respect to a plane defined by the beam and trigger particle (photon, hadron, or jet) with a given orientation relative to the event plane is shown to be closely related to the transverse position of the initial jet production in full event-by-event simulations within the linear Boltzmann transport model. Such a gradient tomography that can be used to localize the initial jet production position for more detailed study of jet quenching and properties of the quark-gluon plasma along a given propagation path in heavy-ion collisions.

This research used the Linear Boltzmann Transport Model (LBT) and CLVisc, which were jointly developed by CCNU and Lawrence Berkeley National Laboratory and verified in nuclear-collisioni simulations the effect of the gradient tomography technology. A plenty of analog computations were completed on the basis of the Nuclear Science Computing Center of CCNU (NSC3) and National Energy Research Scientific Computing Center (NERSC).


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