[Brahms-l] Fwd: New PHENIX paper on A_LL dependence of jets from dihadrons at 200 GeV

> 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 A_LL dependence of jets from dihadrons  
> at 200 GeV
>
> 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: Double Helicity Dependence of Jet Properties from Dihadrons in
> Longitudinally Polarized p+p Collisions at sqrt(s_NN) = 200 GeV
>
> Abstract:
> It has been postulated that partonic orbital angular momentum can lead
> to a significant double-helicity dependence in the net transverse
> momentum of Drell-Yan dileptons produced in longitudinally polarized
> p+p collisions.  Analogous effects are also expected for dijet
> production.  If confirmed by experiment, this hypothesis, which is
> based on semi-classical arguments, could lead to a new approach for
> studying the contributions of orbital angular momentum to the proton
> spin. We report the first measurement of the double-helicity
> dependence of the dijet transverse momentum in longitudinally
> polarized p+p collisions at sqrt(s_NN) = 200 GeV from data taken by
> the PHENIX experiment in 2005 and 2006.  The analysis deduces the
> transverse momentum of the dijet from the widths of the near- and
> far-side peaks in the azimuthal correlation of the dihadrons.  When
> averaged over the transverse momentum of the triggered particle, the
> difference of the root-mean-square of the dijet transverse momentum
> between like- and unlike-helicity collisions is found to be -37 +/-
> 88(stat) +/- 14(syst) MeV/c.

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