Azimuthal Anisotropy in U+U Collisions at = 193 GeV with STAR Detector at RHIC

Yadav Pandit,The Star Collaboration

doi:10.1088/1742-6596/458/1/012003

Yadav Pandit, The Star Collaboration

Open Access

https://doi.org/10.1088/1742-6596/458/1/012003

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Abstract

We report the measurement of first (n = 1) and higher order (n = 2–5) harmonic coefficients (vn) of the azimuthal anisotropy in the distribution of the particles produced in U+U collisions at = 193 GeV, recorded with the STAR detector at RHIC. The differential measurement of (vn) is presented as a function of transverse momentum (pT) and centrality. We also present vn measurement in the ultra-central collisions. These data may provide strong constraints on the theoretical models of the initial condition in heavy ion collisions and the transport properties of the produced medium.

Highlights

The study of azimuthal anisotropy, based on Fourier coefficients, is widely recognized as an important tool to probe the hot, dense matter created in heavy ion collisions [1]
The differential measurement of azimuthal anisotropy have been found to be sensitive to initial condition, thermalization, the equation of state and transport coefficients of the medium in the heavy ion collisions
Contribution from short range correlation such as Bose-Einstein correlations, coulomb interactions are studied using a pseudorapidity gap of at least 0.5 units in pseudorapidity between the event vector and the particle of interest using scalar product method. Results from both methods, scalar product with larger psuedorapidity gap and event plane method with smaller pseudorapidity gap are consistent with each other, which suggests that non-flow contribution from short range correlations are small

Summary

Introduction

The study of azimuthal anisotropy, based on Fourier coefficients, is widely recognized as an important tool to probe the hot, dense matter created in heavy ion collisions [1] These measurements are sensitive to early stage evolution of the system. This analysis was carried out on tracks that had transverse momenta pT > 0.15 GeV/c, passed within 3 cm of the primary vertex, had at least 15 space points in the main TPC acceptance (|η| < 1.0) and the ratio of the number of actual space points to the maximum possible number of space points for that track’s trajectory was greater than 0.52.

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Summary