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Gradient Tomography of Jet Quenching in Heavy-Ion Collisions
Yayun He1, Long-Gang Pang1, Xin-Nian Wang1,2
1Key Laboratory of Quark & Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China.
Physical Review Letters
|October 5, 2020
Summary
The spatial gradient of the jet transport coefficient causes asymmetry in parton momentum distribution. This asymmetry helps localize initial jet production in heavy-ion collisions for studying quark-gluon plasma properties.
Area of Science:
- High-energy nuclear physics
- Quantum chromodynamics (QCD)
- Parton transport phenomena
Background:
- Transverse momentum broadening and energy loss of partons are governed by the jet transport coefficient (q̂) in dense QCD media.
- Spatial gradients in q̂ can induce drift and asymmetry in parton transverse momentum distributions.
Purpose of the Study:
- To investigate the relationship between the spatial gradient of the jet transport coefficient and parton transverse momentum asymmetry.
- To explore the potential of using this asymmetry to determine the initial jet production position in heavy-ion collisions.
Main Methods:
- Numerical solutions of the Boltzmann transport equation using a drift-diffusion equation approximation.
- Full event-by-event simulations employing the linear Boltzmann transport model.
Main Results:
- Parton transverse momentum asymmetry depends on both position along the transverse gradient and path length.
- Asymmetry is closely linked to the initial jet production position in heavy-ion collisions.
- Gradient tomography is proposed as a method to localize initial jet production.
Conclusions:
- The spatial gradient of the jet transport coefficient provides a tool to probe the initial conditions of jet production.
- This technique can enable detailed studies of jet quenching and quark-gluon plasma properties.
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