[Brahms-l] Fw: New STAR Paper from Run 6

FYI
Subject: New STAR Paper from Run 6


> Dear Peter, Barbara, Flemming, and Wit:
> 
> It is my pleasure to announce STAR's intention to submit the
> following paper to Physical Review Letters in one week's time:
> 
> "Measurement of Transverse Single-Spin Asymmetries for Di-Jet Production
> in Proton-Proton Collisions at sqrt(s) = 200 GeV "
> 
> This is the first STAR scientific result from Run 6 data submitted for
> publication. The abstract is enclosed.
> 
>                      Sincerely,
> 
>                      Tim Hallman
> 
> Abstract:
> 
> We report the first measurement of the opening angle distribution 
> between pairs of jets
> produced in high-energy collisions of transversely polarized protons. 
> The measurement
> probes (Sivers) correlations between the transverse spin orientation of 
> a proton and the
> transverse momentum directions of its partons.  With both beams 
> polarized, the wide
> pseudorapidity ($-1 \leq \eta \leq +2$) coverage for jets permits 
> separation of Sivers
> functions for the valence and sea regions. The resulting asymmetries are 
> all consistent
> with zero and considerably smaller than Sivers effects observed in 
> semi-inclusive deep
> inelastic scattering (SIDIS). We discuss theoretical attempts to 
> reconcile the new results
> with the sizable transverse spin effects seen in SIDIS and forward 
> hadron production in pp
> collisions.
>
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