[Brahms-l] Fwd: New PHENIX paper on eta ALL and cross section in 200 GeV p+p

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: Barbara Jacak <jacak_at_skipper.physics.sunysb.edu>
> Date: September 23, 2010 2:19:37 PM EDT
> 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 eta ALL and cross section in 200 GeV p+p
>
> 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
>
> -----------------------------------------------------
> Title:
> Cross section and double helicity asymmetry for eta mesons
> and their comparison to neutral pion production in p+p collisions
> at sqrt(s)=200 GeV
>
> Abstract:
> Measurements of double-helicity asymmetries for inclusive hadron
> production in polarized p+p collisions are sensitive to helicity-- 
> dependent
> parton distribution functions, in particular to the gluon helicity
> distribution,
> Delta(g).  This study focuses on the extraction of the double-helicity
> asymmetry in eta production: polarized p+p --> eta + X, the eta cross
> section, and the eta/pi^0 cross section ratio.  The cross section and
> ratio measurements provide essential input for the extraction of
> fragmentation functions that are needed to access the helicity- 
> dependent
> parton distribution functions.



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