[Brahms-l] Fwd: New PHENIX Paper on Elliptic and Hexadecapole Flow in Au+Au

FY
Flemming Videbaek
videbaek @ bnl.gov
Brookhaven National Lab
Physics Department
Bldg 510D
Upton, NY 11973

phone: 631-344-4106
cell     :  631-681-1596



FYI

Begin forwarded message:

> From: Barbara Jacak <jacak_at_skipper.physics.sunysb.edu>
> Date: March 18, 2010 8:17:26 AM 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 Elliptic and Hexadecapole Flow in Au+Au
>
> 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: Elliptic and hexadecapole flow of charged hadrons in Au+Au  
> collisions
> at sqrt(s_NN) = 200 GeV
>
> Abstract:
> Double-differential measurements of the second (elliptic) and fourth
> (hexadecapole) Fourier flow coefficients (v2 and v4 ) are reported  
> for
> charged hadrons as a function of transverse momentum (pT ) and
> collision centrality or the number of participant nucleons (Npart )  
> for
> Au+Au collisions at √s_NN = 200 GeV. The respective measurements
> at pseudorapidity |η| ≤ 0.35, obtained with four separate reaction  
> plane
> detectors positioned in the range 1.0 < |η| < 3.9 show good  
> agreement,
> indicating the absence of significant η-dependent nonflow  
> perturbations.
> Sizable values for v4 (pT ) are observed with a ratio v4 (pT ,Npart )/
> v2^2(pT ,Npart ) ≈ 0.8 for 50 ≲ Npart ≲ 200; it is compatible  
> with the
> combined effects of a finite viscosity and initial eccentricity  
> fluctuations.
> For Npart ≳ 200 this ratio increases with Npart by as much as a  
> factor of
> two in the most central collisions.



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