Upsilon production in d+Au collisions at STAR - INSPIRE

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Upsilon production in d+Au collisions at STAR

STAR

Collaboration

•

Haidong Liu

for the collaboration.

Jul, 2009

4 pages

Part of Proceedings, 21st International Conference on Ultra-Relativistic nucleus nucleus collisions (Quark matter 2009) : Knoxville, USA, March 30-April 4, 2009

Published in:

Nucl.Phys.A 830 (2009) 235C-238C

Contribution to:

- Quark Matter 2009

e-Print:

0907.4538 [nucl-ex]

DOI:

10.1016/j.nuclphysa.2009.10.019

Experiments:

BNL-RHIC-STAR

View in:

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Abstract: (Elsevier)

We present the analysis of ϒ → e + e − production in d+Au collisions at s N N = 200 GeV from the STAR experiment. Using higher level dedicated ϒ triggers, STAR has sampled 32 nb − 1 of integrated luminosity in year 2008 d+Au run. The cross section is found as B R × ( d σ d y ) y = 0 ϒ ( 1 S + 2 S + 3 S ) = 35 ± 4 ( s t a t . ) ± 5 ( s y s . ) nb and it is consistent with NLO CEM prediction with anti-shadowing effects. In addition we calculated the nuclear modification factor R d A u = 0.98 ± 0.32 ( s t a t . ) ± 0.28 ( s y s . ) , which suggests the ϒ ( 1 S + 2 S + 3 S ) production follows N b i n scaling.

Note:

4 pages, 2 figures - To appear in the conference proceedings for Quark Matter 2009, March 30 - April 4, Knoxville, Tennessee (Updated v1)

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