[Brahms-l] Fwd: STAR paper on neutral pion double-spin asymmetry and cross section

FYI


Flemming Videbaek
videbaek @ bnl.gov
Brookhaven National Lab
Physics Department
Bldg 510D
Upton, NY 11973

phone: 631-344-4106
cell     :  631-681-1596





Begin forwarded message:

> From: Nu Xu <NXu_at_lbl.gov>
> Date: November 6, 2009 8:47:07 PM EST
> To: Barbara Jacak <Barbara.Jacak_at_stonybrook.edu>, wit Busza <busza_at_MIT.EDU 
> >, Flemming Videbaek <videbaek_at_bnl.gov>, Steven Vigdor  
> <vigdor_at_bnl.gov>
> Cc: Nu Xu <NXu_at_lbl.gov>
> Subject: STAR paper on neutral pion double-spin asymmetry and cross  
> section
>
> Dear Barbara, Wit, Flemming and Steve,
>
> I am pleased to announce that the STAR collaboration will submit to  
> Phys. Rev. D (Rapid communications),  in one week's time,  a new  
> paper on neutral pion double-spin asymmetry and cross section in  
> polarized proton collisions at RHIC. The title and abstract are  
> included below.
>
> Best regards,
>
> Nu Xu
>
> -----------------------------------------------------------------------
> Nu Xu
>
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> -----------------------------------------------------------------------
>
> =============================================================
> Title: "Longitudinal double-spin asymmetry and cross section for  
> inclusive neutral pion production at midrapidity in polarized proton  
> collisions at $\sqrt{s}$ = 200 GeV"
>
> Abstract: "We report a measurement of the longitudinal double-spin  
> asymmetry $A_{LL}$ and the differential cross section for inclusive $ 
> \pi^{0}$ production at midrapidity in polarized proton collisions at  
> $\sqrt{s}$ = 200 GeVl. The cross section was measured over a  
> transverse momentum range of 1 < $p_T$ < 17 GeV/c and found to be in  
> good agreement with next-to-leading order perturbative QCD  
> calculation. The longitudinal double-spin asymmetry was measured in  
> the range of 3.7 < $p_T$ < 11 GeV/c and excludes a maximal positive  
> gluon polarization in the proton. The mean transverse momentum  
> fraction of $\pi^{0}$'s in their parent jets was found to be around  
> 0.7 for electromagnetically triggered events."



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