Title

Upsilon measurements in the STAR experiment

Author's Department

Physics Department

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https://arxiv.org/pdf/1005.4100v1.pdf

All Authors

A. M. Hamed

Document Type

Research Article

Publication Title

arXiv preprint arXiv:1005.4100.

Publication Date

9-18-2015

Abstract

The Υ(1S+2S+3S)→e+e− cross section is measured at mid-rapidity (y) in p+p collisions and in d+Au collisions at center-of-mass energy s√ = 200 GeV with the STAR detector at RHIC. In p+p, the measured cross section is found to be consistent with the world data trend as a function of s√, in agreement with the Color Evaportaion Model (CEM), and underestimated by the Color Singlet Model (CSM) up to the Next-to-Leading-Order Quantum Chromodynamics (NLO QCD) calculations. In d+Au, the measured cross section is in agreement with the CEM prediction with anti-shadowing effects, and the nuclear modification factor indicates that Υ(1S+2S+3S) production follows binary scaling within the current uncertainties. These measurements provide a benchmark for the future measurements of Υ production in Au+Au collisions.

First Page

1

Last Page

4

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