[Brahms-l] Fw: New STAR Paper on longitudinal double spin asymmetry

FYI


From: "Tim Hallman" <hallman_at_bnl.gov>
To: "Steve Vigdor" <vigdor_at_indiana.edu>; "jacak, barbara" <jacak_at_skipper.physics.sunysb.edu>; "Videbaek, Flemming" 
<videbaek_at_bnl.gov>; "Busza, Wit" <busza_at_mit.edu>
Cc: "Hallman" <hallman_at_bnl.gov>
Sent: Wednesday, October 03, 2007 4:10 PM
Subject: New STAR Paper on longitudinal double spin asymmetry


> Dear Steve, 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:
>
> "Longitudinal double-spin asymmetry for inclusive jet production in
> $\vec{p}+\vec{p}$ collisions at $\sqrt{s}$=200 GeV"
>
> The abstract is enclosed.
>
>                        Sincerely,
>
>                        Tim Hallman
>
>
> Abstract:
>
> We report a new STAR measurement of the longitudinal double-spin
> asymmetry $A_{LL}$ for inclusive jet production at mid-rapidity in
> polarized $p+p$ collisions at a center-of-mass energy of $\sqrt{s} =
> 200\,\mathrm{GeV}$.  The data, which cover jet transverse momenta $5 <
> p_T <30 \,\mathrm{GeV/c}$, are substantially more precise than previous
> measurements.  When compared to predictions derived from one global fit
> to polarized deep-inelastic scattering measurements, these results
> constrain the gluon contribution to be less than $60\%$ of the proton spin
> with $90\%$ confidence.
> 

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