# QM 2011 - XXII International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

May 22 – 28, 2011
Centre Bonlieu
Europe/Zurich timezone

## Underlying event studies in d+Au collisions at $\sqrt{s_NN}$=200 GeV from STAR

Not scheduled
Théâtre National (Centre Bonlieu)

France
Board: 18
Poster Jets

### Speaker

Dr Jana Bielcikova (Nuclear Physics Institute ASCR)

### Description

Description of heavy-ion collisions, where modifications of the fragmentation functions due to interaction of partons with the hot and dense medium are expected, is a challenging task and requires a detailed understanding of small collision systems such as p+p and d+Au. Comparison of measurements in p+p and d+Au collisions can be further used to disentangle initial state effects from cold nuclear matter effects. Particles produced in p+p and d+Au collisions originate not only from hard scatterings, but soft and semi-hard multiple parton interactions and initial- and final-state radiation combine to produce particles at mid-rapidity which constitute the so called underlying event. The STAR collaboration at RHIC recently presented first results on underlying event properties in p+p collisions at $\sqrt{s_NN}$=200 GeV. We extend these studies and investigate in detail properties of underlying event in d+Au collisions at $\sqrt{s_{NN}}$=200 GeV. The analysis is based on the large d+Au data sample collected by the STAR experiment in year 2008. The extracted underlying event properties are compared to those from p+p collisions. The obtained results will serve as input to Monte Carlo models.

### Primary author

Dr Jana Bielcikova (Nuclear Physics Institute ASCR)

 Poster