[Brahms-l] Fw: New PHENIX paper on single-spin asymmetries

FYI

(I do wonder how this almost obvious result can be a PRL)

Fv
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Flemming Videbaek
Physics Department
Brookhaven National Laboratory

e-mail: videbaek@bnl.gov
phone: 631-344-4106
----- Original Message ----- 
From: "W.A. Zajc" <zajc@nevis.columbia.edu>
To: "Wit Busza" <busza@mit.edu>; "'Tim Hallman'" <hallman@bnl.gov>;
"'Videbaek, Flemming'" <videbaek@bnl.gov>; "'Samuel H. Aronson'"
<aronsons@bnl.gov>
Sent: Sunday, July 10, 2005 7:47 PM
Subject: New PHENIX paper on single-spin asymmetries


> Dear Wit, Tim, Flemming and Sam:
>
> I am pleased to inform you that the PHENIX Collaboration intends to submit
> to Physical Review Letters in one week's time a manuscript on mid-rapidity
> transverse single-spin asymmetries. The title and abstract are included
> below.
>
> Best regards,
>
> Bill
>
>
>
> TITLE: Measurement of Transverse Single-Spin Asymmetries for Mid-rapidity
> Production of Neutral Pions and Charged Hadrons in Polarized p+p
Collisions
> at \sqrt{s} = 200 GeV
>
> ABSTRACT: The transverse single-spin asymmetries of neutral pions and
> non-identified charged hadrons have been measured at mid-rapidity in
> polarized proton-proton collisions at vs = 200 GeV. The data cover a
> transverse momentum (pT ) range 0.5-5.0 GeV/c for charged hadrons and
> 1.0-5.0 GeV/c for neutral pions, at a Feynman-x (xF ) value of
approximately
> zero. The asymmetries seen in this previously unexplored kinematic region
> are consistent with zero within statistical errors of a few percent. In
> addition, the inclusive charged hadron cross section at mid-rapidity from
> 0.5 < pT < 7.0 GeV/c is presented and compared to NLO pQCD calculations.
> Successful description of the unpolarized cross section above  ~2 GeV/c
> using NLO pQCD suggests that pQCD is applicable in the interpretation of
the
> asymmetry results in the relevant kinematic range.
>


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