[Brahms-l] Fwd: New PHENIX Paper on reaction plane dependence of dijets

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 28, 2010 8:40:26 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 reaction plane dependence of dijets
>
> 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.
> C. on the topic indicated in the subject line. Please
> find the title and abstract below.
>
> best regards,
> Barbara
>
> -----------------------------------------------------
> Title:
> Suppression of Away-side Jet Fragments with Respect
> to the Reaction Plane in Au+Au Collisions at
> $\sqrt{s_{_{NN}}}$ = 200 GeV
>
> Abstract:
> Pair correlations between large transverse momentum
> neutral pion triggers ($p_{T} = 4$-$7$ GeV/$c$) and charged
> hadron partners ($p_{T} = 3$-$7$ GeV/$c$) in central (0-20\%)
> and mid-central (20-60\%) Au+Au collisions are presented as a
> function of trigger orientation with respect to the reaction plane.
> The particles are at larger momentum than where jet shape
> modifications have been observed, and the correlations are
> sensitive to the energy loss of partons traveling through hot
> dense matter. An out-of-plane trigger particle produces only
> $(26\pm20)\%$ of the away-side pairs that are observed
> opposite of an in-plane trigger particle. In contrast, near-side
> jet fragments are consistent with no suppression or dependence
> on trigger orientation with respect to the reaction plane. These
> observations are qualitatively consistent with a picture of little
> near-side parton energy loss either due to surface bias or
> fluctuations and increased away-side parton energy loss due
> to a long path through the medium. The away-side suppression
> as a function of reaction-plane angle is shown to be sensitive
> to both the energy loss mechanism in and the space-time
> evolution of heavy ion collisions.



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