[Brahms-l] Fwd: New PHENIX Paper on J/psi polarization in p+p

FYI


> From: Barbara Jacak <jacak_at_skipper.physics.sunysb.edu>
> Date: December 3, 2009 2:17:08 PM EST
> 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 polarization in 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.
> Lett. B on the topic indicated in the subject line.
> Please find the title and abstract below.
>
> best regards,
> Barbara
>
>
> Title:Transverse momentum dependence of $J/\psi$ polarization at
> mid-rapidity in $p$+$p$ collisions at $\sqrt{s}=$ 200 GeV.
>
> Abstract:
> We report the measurement of the transverse momentum dependence
> of inclusive $J/\psi$ polarization in $p$+$p$ collisions at \sqrt{s}= 
> $ 200
> GeV performed by the PHENIX Experiment at RHIC. The polarization is
> studied in the helicity, Gottfried-Jackson and Collins-Soper frames
> for $p_T<5$ GeV/$c~$ and $|y|<0.35$. The $J/\psi$ polarization in the
> helicity and Gottfried-Jackson frames is consistent with zero for all
> transverse momenta, with a slight (1.8 sigma) trend towards
> longitudinal polarization for transverse momenta above 2 GeV/$c$. No
> conclusion can be made in the Collins-Soper frame with the current
> data. The results are compared to observations for other collision
> systems and center of mass energies and to different quarkonia
> production models.

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