Data-driven constraints on the drag and diffusion of light partons

4 Nov 2019, 17:40
Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Poster Presentation Jet modifications and medium response Poster Session


Tianyu Dai (Duke University)


Interactions between hard partons and the quark-gluon plasma range from frequent soft collisions to rare large angle scatterings. The larger number of soft interactions makes possible an effective stochastic description of parton-plasma interactions in terms of drag and diffusion transport coefficients [1]. We build on the methodical division between soft and hard parton-plasma interactions derived in Ref. [2] and present a first Monte-Carlo implementation of this reformulated parton energy loss model. We discuss the model's dependence on the scale separating soft and hard interactions, both for small and large values of the strong coupling constant.

Using the model's systematic separation between the transport (soft) sector of the parton energy loss and harder vacuum-like interactions, we perform a Bayesian analysis to calibrate the model to jet measurements and extract the transport properties of light partons propagating in a strongly-coupled quark-gluon plasma. We constrain the drag and diffusion coefficients alongside the strong coupling constant and the scale separating soft and hard parton-plasma interactions, and discuss the physical interpretation of the phenomenologically-constrained soft/hard scale.

[1] Moore and Teaney, Phys.Rev.C71:064904 (2005)
[2] Ghiglieri, Moore and Teaney, JHEP1603:095 (2016)

Primary authors

Tianyu Dai (Duke University) Steffen A. Bass (Duke University) Jean-Francois Paquet (Duke University) Derek Teaney (Stony Brook University)

Presentation Materials