# Quark Matter 2018

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

## PHENIX study of the initial state with forward hadron measurements in 200 GeV p(d)+A and $^{3}$He$+$Au collisions

May 16, 2018, 4:50 PM
20m
Sala Volpi, 1st Floor (Palazzo del Casinò)

### Sala Volpi, 1st Floor

#### Palazzo del Casinò

Parallel Talk Initial state physics and approach to equilibrium

### Speaker

Dr Jason Bryslawskyj

### Description

Forward hadron measurements in p(d)+A provide a signal to study nuclear
shadowing, initial state energy loss and/or gluon saturation effects as a function of rapidity, centrality and energy. High $p_T$ identified $\pi^{0}$ measurements are also an essential first step toward measuring prompt photon production. The $\pi^{0}$ measurements are enabled by the PHENIX MPC-EX detector, a Si-W preshower detector located in front of Muon Piston Calorimeter (MPC), expanding the neutral pion reconstruction capabilities in the rapidity range $3.1< \eta <3.8$ out to high energies, $E < 80$ GeV. Previous PHENIX measurements of punch-through charged hadrons in the muon arms in the rapidity range $1.4< \vert \eta \vert <2.2$ were significantly improved through the capability of the forward silicon vertex detector (FVTX) to determine the transverse momentum and rapidity with high precison and reject background from secondary hadrons.

PHENIX collected d+Au data with the MPC-EX in the 2016 run at
$\sqrt{s_{NN}} =$ 200, 62, 39 and 19.6 GeV; and p+p and p+Au(Al) data with the FVTX in 2015 at 200 GeV. In this talk we will present first results for high $p_T$ $\pi^{0}$ production from the $\sqrt{s_{NN}}$ = 200 GeV dataset, the status of the prompt photon measurement, as well as charged hadron nuclear modification factors in p+Au(Al) and $^{3}$He$+$Au.

Content type Experiment PHENIX Presenter name already specified

### Primary author

Gabor David (Brookhaven National Laboratory)