# Quark Matter 2012

12-18 August 2012
US/Eastern timezone

## Measurements of the Correlation between Jets and the Reaction Plane in STAR at RHIC

15 Aug 2012, 11:40
20m

Oral Presentation Jets

### Speaker

Alice Ohlson (Yale University)

### Description

The relationship between jet properties and the underlying geometry of the medium produced in heavy ion collisions can be explored through a measurement of the correlation between the axes of reconstructed jets and the reaction plane (defined as jet $v_2$). Such a measurement provides information on the pathlength dependence of medium-induced parton energy loss as well as biases in jet-finding methods. In addition, an estimate of jet $v_2$ is necessary for background-subtraction in jet-triggered correlation analyses, which are used to study medium-induced jet shape modification. However, jet $v_2$ measurements are complicated by biases in the event plane calculation due to the presence of the jet, leading to an overestimation of jet $v_2$. In order to reduce the artificial jet-event plane bias, we utilize detectors at forward pseudorapidity ($\eta$), such as the Forward Time Projection Chambers located at $2.5 < |\eta| < 4$ and the Zero Degree Calorimeter Shower Maximum Detectors at $|\eta| > 6.3$, to determine the event plane when measuring $v_2$ of reconstructed jets at mid-rapidity ($|\eta| < 1$). We present first results of jet $v_2$ measurements in $\sqrt{s_{NN}}$ = 200 GeV Au+Au collisions in STAR and their implications.

### Primary author

Alice Ohlson (Yale University)

 Slides

Paper files: