# 11th international workshop on High-pT Physics in the RHIC & LHC Era

12-15 April 2016
BNL Physics Building
US/Eastern timezone

## PHENIX results on reconstructed jets in $p$+$p$, $d$+Au, and Cu+Au collisions

13 Apr 2016, 11:30
30m
Large Seminar Room (BNL Physics Building)

### Speaker

Dr Arbin Timilsina (Iowa State University)

### Description

PHENIX has measured the inclusive jet spectra in $p$+$p$, $d$+Au, and Cu+Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV and mid-rapidity. Jets were reconstructed from charged particle tracks and electromagnetic calorimeter clusters utilizing the anti-kT algorithm. The measurements are unfolded for detector response and the $p$+$p$ jets are consistent with a differential NLO cross-section calculation within the transverse momentum range $p_{T}$ = 12-50 GeV/$c$. he nuclear modification factor for centrality integrated data in deuteron-gold collisions is found to be consistent with unity, strongly limiting the role of initial or final state effects. However, the centrality-selected modification factor shows substantial deviations from unity, with a qualitative pattern similar that observed at the LHC albeit at a smaller momentum. These measurements provide crucial new information for understanding the anomalous relationship between hard and soft processes in $p$/$d$+A systems. Meanwhile the Cu+Au collision system offers an intermediate testing ground for heavy ion jet reconstruction between small systems and those with the largest heavy ions. The underlying event in Cu+Au events is smaller when compared to that in the largest heavy ion systems, simplifying the extraction of the jet signals, but still achieving the large energy densities needed to drive substantial in-medium energy loss. We show the large suppression in central heavy ion events against a variety of energy loss theoretical calculations.

### Primary author

Dr Arbin Timilsina (Iowa State University)

 Slides