[Brahms-l] Fw: New STAR paper on Mass, quark-number and energy dependence

FYI
--------------------------------------------
Flemming Videbaek
Physics Department
Bldg 510-D
Brookhaven National Laboratory
Upton, NY11973

phone: 631-344-4106
cell:       631-681-1596
fax:        631-344-1334
e-mail: videbaek @ bnl gov
----- Original Message ----- 
From: "Hallman, Timothy J" <hallman_at_bnl.gov>
To: "Bond, Peter D" <bond_at_bnl.gov>; "Videbaek, Flemming" <videbaek_at_bnl.gov>; "Busza, Wit" <busza_at_mit.edu>; 
<jacak_at_skipper.physics.sunysb.edu>
Cc: "Hallman, Timothy J" <hallman_at_bnl.gov>
Sent: Thursday, December 28, 2006 11:13 AM
Subject: New STAR paper on Mass, quark-number and energy dependence


> Dear Peter, Barbara, Flemming, and Wit:
>
> It is my pleasure to announce STAR's intention to submit the
> following paper to Physical Review C in one week's time:
>
>
> "Mass, quark-number, and energy dependence of the
> second and fourth flow harmonics in ultra-relativistic
> nuclear collisions"
>
> The abstract is enclosed.
>
>                         Sincerely,
>
>                         Tim Hallman
>
> Abstract:
>
> We present STAR measurements of the azimuthal anisotropy parameter
> $v_2$ for pions, kaons, protons, Lambdas, Cascades, and Omegas,
> along with $v_4$ for pions, kaons, protons, and Lambdas for Au+Au
> collisions at $\sqrt{s_{_{NN}}}=62.4$ and 200~GeV. The $v_2$
> values for all species at 62.4 GeV are similar to those observed in 130
> and 200 GeV collisions. $v_2$ at 62.4, 130, and 200 GeV are
> approximately 20\% larger than those in Pb+Pb collisions at
> $\sqrt{s_{_{NN}}}=17.2$ GeV. At intermediate transverse
> momentum ($p_T$ from 1.5--5~GeV/c), the 62.4~GeV $v_2(p_T)$
> and $v_4(p_T)$ values are found to be consistent with the
> quark-number scaling first observed at 200 GeV. A four-particle
> cumulant analysis is used to assess the non-flow contributions to
> pions and protons and some indications are found for a smaller
> non-flow contribution to protons than pions. Baryon $v_2$ is
> found to be larger than anti-baryon $v_2$ at 62.4 and 200 GeV
> perhaps indicating that the mechanism leading to transport of baryon
> number from beam- to mid-rapidity enhances $v_2$.
>
> 

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