The problem of overlapping formation times: A complete result for QCD

3 Jun 2020, 12:45
20m
https://cern.zoom.us/j/95672106059

https://cern.zoom.us/j/95672106059

Oral Presentation New Theoretical Developments Parallel

Speaker

Dr Shahin Iqbal (Institute of Particle Physics, Central China Normal University)

Description

The splitting processes of bremsstrahlung and pair-production in a medium are coherent over large distances in the high energy limit leading to a suppression known as the Landau-Pomeranchuk-Migdal (LPM) effect. Avoiding soft-emission approximations and working in the large-Nc limit, we consider corrections to the LPM effect from cases where the coherence lengths of two consecutive splittings overlap. In this work, we present (i) complete results for the case of two overlapping gluon splittings (e.g. $g\rightarrow gg\rightarrow ggg$ and virtual corrections to single splitting $g\rightarrow gg^{*}\rightarrow ggg^{*}\rightarrow gg$) and (ii) confirm that earlier leading-log results for these effects are reproduced by our more-complete results in the appropriate soft limit. We also discuss how to combine the effects of overlapping real double splitting with the corresponding virtual corrections to single splitting in order to calculate IR-safe quantities such as in-medium energy loss.

Track New Theoretical Developments
Contribution type Contributed Talk

Primary authors

Peter Arnold (University of Virginia) Tyler Gorda (University of Virginia) Dr Shahin Iqbal (Institute of Particle Physics, Central China Normal University)

Presentation Materials