[Brahms-l] Fw: New PHENIX paper on Run3+Run4 A_LL(pi0)

FYI
Subject: New PHENIX paper on Run3+Run4 A_LL(pi0)


> Dear Wit, Tim, Flemming and Sam:
> 
> In one week's time, PHENIX plans to submit a paper to Physical Review D as a
> Rapid Communication on our improved A_LL measurements for pi^0. The title
> and abstract are included below.
> 
> Best regards,
> 
> Bill
> 
> ----------------------------------------------------------------------------
> ------------
> 
> Title:   Improved Measurement of Double Helicity Asymmetry
>         in Inclusive Midrapidity pi^0 Production for
>         Polarized p+p Collisions at sqrt(s)=200 GeV
> 
> Abstract:
> 
> We present an improved measurement of the double helicity asymmetry for pi^0
> production in polarized proton-proton scattering at sqrt(s)=200 GeV
> employing the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC).
> The improvements to our previous measurements come from two main factors:
> Inclusion of a new data set from the 2004 RHIC run with higher beam
> polarizations than the earlier run; and a recalibration of the beam
> polarization, which resulted in reduced uncertainties and increased beam
> polarizations.  The results are compared to a NLO pQCD calculation with a
> range of polarized gluon distributions.
>
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