5–11 Feb 2017
Hyatt Regency Chicago
America/Chicago timezone

Photon and neutral pion separation in the PHENIX MPC-EX detector

Not scheduled
2h 30m
Hyatt Regency Chicago

Hyatt Regency Chicago

151 East Wacker Drive Chicago, Illinois, USA, 60601
Board: F15

Speaker

Jaehyeon Do

Description

The MPC-EX Si-W preshower sits in front of a PbWO4 electromagnetic calorimeter, and consists of eight layers of thin tungsten plates and Si sensors. It covers the forward pseudorapidity range of 3.1 < eta < 3.8 and enabled the study of low-x partons in the gold nucleus through prompt photon production in p+A collisions. Each silicon sensor is divided into mini-pad sensors (2mm x 16mm) to provide detailed shape and evolution of EM showers. The MPC-EX is designed to reconstruct and identify neutral pions up to ~80-100 GeV. Two photons decayed from a high momentum neutral pion can not be easily separated from a single photon in the preshower detector. By examining topological shapes of showers in the MPCEX, we can distinguish between merged double photons from a neutral pion and a single prompt photon based on a multivariate probability analysis. In this poster we will describe the shower properties which enable separation of prompt photons and pi0's with high purity and efficiency. The performance of this topological separation will be presented.

Preferred Track Jets and High pT Hadrons
Collaboration PHENIX

Primary author

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