We upgraded Indico to version 3.0. The new search is now available as well.

# Hard Probes 2018: International Conference on Hard & Electromagnetic Probes of High-Energy Nuclear Collisions

30 September 2018 to 5 October 2018
Aix-Les-Bains, Savoie, France
Europe/Zurich timezone
PROCEEDINGS OPEN UNTIL DECEMBER 15th 2018

## Confronting jet quenching with jet grooming: groomed jet mass distributions in heavy ion collisions

3 Oct 2018, 10:45
20m
Aix-Les-Bains, Savoie, France

#### Aix-Les-Bains, Savoie, France

Aix-Les-Bains, Congress Center Student Lectures Day: September 30 at CERN
2a) Jets and high-pT hadrons (TALK)

### Speaker

Dr Yang-Ting Chien (Massachusetts Institute of Technology)

### Description

I will present a calculation of jet mass distributions for small-radius jets in proton-proton and heavy ion collisions using soft-collinear effective theory (SCET). A process-independent groomed jet mass function is defined which captures the soft-collinear radiation inside jets. The factorization expression simplifies significantly, allowing one to calculate jet mass distributions for jets in any hard process with the corresponding jet cross section. Additional contributions from initial and final state radiation as well as underlying events are discussed. With the medium-induced splitting functions calculated using SCET with Glauber gluon interactions, the medium correction to jet mass distributions is incorporated consistently within the resummation framework. We provide calculations of jet mass distributions for inclusive jets and jets recoiling against a prompt photon or a $Z$ boson, and we compare with Pythia simulations of pp collisions and currently available measurements in pp and AA collisions at the LHC. In the end I will discuss the calculation of a new, collinear-drop jet observable and its use for systematically probing the inner working of the quark gluon plasma.

### Primary author

Dr Yang-Ting Chien (Massachusetts Institute of Technology)

Ivan Vitev