# 10th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions

May 31, 2020 to June 5, 2020
Online
US/Central timezone

## QCD Correlations in Multiple Gluon Bremsstrahlung

Jun 3, 2020, 1:25 PM
20m
https://cern.zoom.us/j/95672106059

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

Oral Presentation New Theoretical Developments

### Speaker

William Alexander Horowitz (University of Cape Town (ZA))

### Description

We compute for the first time the spectrum for emitting 1, 2, and 3 soft and collinear gluons from a hard scattering process in full QCD. This result is important because 1) all current energy loss calculations assume QED-like independent emissions of multiple gluons, which obviously misses all correlations from the non-Abelian nature of QCD, and 2) the average high-p$_{\mathrm{T}}$ parton emits ~3 gluons as it escapes the medium. QCD correlations are therefore critical for any realistic comparison of theoretical predictions to experimental data on jets and jet substructures in heavy ion collisions. These calculations additionally provide a benchmark for jet Monte Carlo algorithms. As part of the talk, we will give a brief overview of the spinor helicity formalism, sometimes referred to as a twistor expansion or the use of maximal helicity violating (MHV) techniques, which provide the massive simplifications necessary for performing the novel derivations.

Contribution type Contributed Talk New Theoretical Developments

### Primary author

William Alexander Horowitz (University of Cape Town (ZA))

### Presentation materials

 200603(HP)Horowitz.pptx Recording