[Brahms-l] Fw: New STAR Ppaer on Global polarization measurement in Au+Au collisions

FYI
Sent: Monday, April 30, 2007 4:26 PM
Subject: New STAR Ppaer on Global polarization measurement in Au+Au collisions


> Dear Peter, Barbara, Flemming, and Wit:
> 
> It is my pleasure to announce STAR's intention to submit the
> following paper to Phys. Rev. C  in one week's time:
> 
> "Global polarization measurement in Au+Au collisions"
> 
> The abstract is enclosed.
> 
>                       Sincerely,
> 
>                       Tim Hallman
> 
> _Abstract_
> 
> The system created in non-central relativistic nucleus-nucleus collisions 
> possesses large orbital angular  momentum. 
> Due to spin-orbit coupling, particles produced in such a system 
> could become globally polarized 
> along the direction of the system angular momentum. 
> We present the results of Lambda and anti-Lambda 
> hyperon global polarization measurements in 
> Au+Au collisions at sqrt{s_NN}=62.4 GeV and 200 GeV 
> performed with the STAR detector at RHIC. 
> The observed global polarization of Lambda and anti-Lambda 
> hyperons in the STAR acceptance is consistent with zero 
> within the precision of the measurements. 
> The obtained upper limit, |P_{Lambda,anti-Lambda| <= 0.02, 
> is compared to the theoretical values discussed recently in the literature. 
> 
>
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