# Quark Matter 2018

13-19 May 2018
Venice, Italy
Europe/Zurich timezone
The organisers warmly thank all participants for such a lively QM2018! See you in China in 2019!

## Low-mass Dielectrons in p-Pb collisions at sqrt(sNN) = 5.02 TeV with ALICE

15 May 2018, 17:00
2h 40m
First floor and third floor (Palazzo del Casinò)

### First floor and third floor

#### Palazzo del Casinò

Poster Electromagnetic and weak probes

### Speaker

Aaron Capon (Stefan Meyer Institute for Subatomic Physics (SMI), Austrian Academy of Sciences (AT))

### Description

A very promising probe to study the quark-gluon plasma, a deconfined state of
quarks and gluons predicted by lattice quantum chromodynamics calculations
in ultra-relativistic heavy-ion collisions, are correlated dielectron pairs.
Electrons reach the detector without significant final state
interactions. In addition, the low-mass dielectron spectrum comes from various
sources, i.e. Dalitz and resonance decays of pseudoscalar and vector mesons,
semi-leptonic decays of charm and beauty hadrons, as well dielectrons from the
thermalised system, which are produced at all stages of the collision.
Therefore, they can be used to study the space-time evolution of the system.

While pp collisions provide an important baseline measurement in vacuum for
heavy-ion studies, p-Pb collisions can be used to disentangle cold from hot
nuclear matter effects. Moreover, recent studies in small colliding systems
(pp and p-Pb) showed intriguing collective behaviours similar to observations previously
done in heavy-ion collisions. They require further investigations in
particular as a function of the event charged-particle multiplicity. Searching
for the thermal signatures through dielectrons is also important in small
systems to disentangle the initial state effects and final state effects.

In this poster the latest status of the dielectron analysis with ALICE in
p-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV will be presented. Data recorded
in 2016 are used. Furthermore, it will be discussed how a multivariate approach
can be useful in the measurements of low-mass dielectrons.

Content type Experiment ALICE Presenter name already specified

### Primary author

Aaron Capon (Stefan Meyer Institute for Subatomic Physics (SMI), Austrian Academy of Sciences (AT))