[Brahms-l] Fwd: New PHENIX paper on J/psi single spin asymmetry

FYI


> To: Nu Xu <NXu_at_lbl.gov>, Wit Busza <busza_at_mit.edu>, "Videbaek,  
> Flemming" <videbaek_at_bnl.gov>, "Vigdor, Steven" <vigdor_at_bnl.gov>
> Subject: New PHENIX paper on J/psi single spin asymmetry
>
> Dear Nu, Wit, Flemming and Steve,
>
> I am happy to announce that in one week's time, the
> PHENIX Collaboration will submit a paper to Phys.Rev.
> D. on the topic indicated in the subject line. Please
> find the title and abstract below.
>
> best regards,
> Barbara
>
> -----------------------------------------------------
>
> Measurement of Transverse Single-Spin Asymmetries for J/Psi Production
> in Polarized p + p Collisions at sqrt{s} = 200 GeV
>
> We report the first measurement of transverse single-spin asymmetries
> in J/Psi production from transversely polarized p+p collisions at
> sqrt{s} = 200 GeV with data taken by the PHENIX experiment in 2006 and
> 2008. The measurement was performed over the rapidity ranges  1.2 <
> |y| < 2.2 and |y| < 0.35 for transverse momenta up to 6 GeV/c.  J/Psi
> production at RHIC is dominated by processes involving initial-state
> gluons, and transverse single-spin asymmetries of the J/Psi can
> provide access to gluon dynamics within the nucleon.   Such
> asymmetries may also shed light on the long-standing question in QCD
> of the J/Psi production mechanism.  Asymmetries were obtained as a
> function of J/Psi transverse momentum and Feynman-x, with a value of
> -0.086 +- 0.026 (stat.) +- 0.003 (sys.) in the forward region.  This
> result suggests possible non-zero trigluon correlation functions in
> transversely polarized protons, and, if well defined in this reaction,
> a non-zero gluon Sivers distribution function.



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