[Brahms-l] Fwd: New PHENIX paper on Dihadron Correlations

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: January 29, 2010 6:43:56 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 Dihadron Correlations
>
> 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. Lett. on the topic indicated in the subject line.
> Please find the title and abstract below.
>
> best regards,
> Barbara
>
> Title: Transition between Medium Modification and Vacuum
> Fragmentation in Dihadron Correlations in Relativistic Heavy Ion  
> Collisions
>
> Abstract:
> Fast parton probes produced by hard scattering and embedded within
> collisions of large nuclei have shown that partons suffer large energy
> loss and that the produced medium may respond collectively to the lost
> energy. We present measurements of neutral pion trigger particles at
> transverse momenta p^t_T = 4-12 GeV/c and associated charged
> hadrons (p^a_T = 0.5-7 GeV/c) as a function of relative azimuthal  
> angle
> Delta Phi in Au+Au and p+p collisions at sqrt(s_NN) = 200 GeV. These
> data lead to two major observations. First, the relative angular  
> distribution
> of low momentum hadrons, whose shape modification has been interpreted
> as a medium response to parton energy loss, is found to be modified  
> only
> for p^t_T < 7 GeV/c. Above this threshold, no shape modification is  
> observed,
> even for the lowest measured p^a_T . This observation presents a  
> quantitative
> challenge to medium response scenarios. Second, the associated yield  
> of
> hadrons opposite to the trigger particle in Au+Au relative to that in
> p+p (I_AA)
> is found to be suppressed at large momentum (IAA ~ 0.35-0.5), but  
> less than
> the single particle nuclear modification factor (R_AA ~ 0.2).

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