# Quark Matter 2012

12-18 August 2012
US/Eastern timezone

## How does longitudinal drag change the radiative energy loss rate?

16 Aug 2012, 16:00
2h

Poster Jets

### Speaker

Guang-You Qin (Duke University/Wayne State University)

### Description

Jets propagating through dense matter are modified due to the scattering between the patrons of the jet with the constituents of the medium. Such scattering leads to an exchange of momenta between the medium and the jet, and has components that are both parallel and perpendicular to the direction of jet propagation. These scatterings introduce both drag and diffusion, and also change the rate of parton splitting leading to radiative energy loss. In all current calculations of jet modification, only the effect of transverse scattering (quantified by $\hat{q}$) on stimulated emission has been considered. The effect of longitudinal exchange, leading to a drag and diffusion of the produced patrons, is included separately. We compute, for the first time, the gluon emission rate from a hard quark in the presence of both transverse and longitudinal exchange. Depending on the size of the longitudinal drag and diffusion coefficients, longitudinal scattering is shown to influence the radiative energy loss of a hard quark in a dense medium in a non-intuitive way. Ramifications of this effect for the phenomenology of jet quenching in heavy-ion collisions will also be presented.

### Primary author

Guang-You Qin (Duke University/Wayne State University)

### Co-author

Abhijit Majumder (Wayne State University)

### Presentation Materials

There are no materials yet.