[Brahms-l] Fw: New STAR Ppaer on Spectra from Au+Au Collisions at 62 and 200 GeV

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


Sent: Monday, March 12, 2007 8:31 PM
Subject: New STAR Ppaer on Spectra from Au+Au Collisions at 62 and 200 GeV


> Dear Peter, Barbara, Flemming, and Wit:
> 
> It is my pleasure to announce STAR's intention to submit the
> following paper to Physics Letters B in one week's time:
> 
> "Energy dependence of  pi, p and pbar transverse momentum
> spectra for Au+Au collisions at SqrtsNN = 62.4 and 200 GeV "
> 
> The abstract is enclosed.
> 
>                       Sincerely,
> 
>                       Tim Hallman
> 
> _Abstract_
> 
> We study the energy dependence of the transverse momentum (pT)
> spectra for charged pions, protons and anti-protons for Au+Au
> collisions at SqrtsNN = 62.4 and 200 GeV. Data are presented at
> mid-rapidity (|y| < 0.5) for 0.2 < pT < 12 GeV/c. In the
> intermediate pT region (2 < pT < 6 GeV/c), the nuclear modification
> factor is higher at 62.4 GeV than at 200 GeV, while at higher
> pT (pT > 7 GeV/c) the modification is similar for both energies.
> The p/pi+ and pbar/pi- ratios for central collisions at
> SqrtsNN = 62.4 GeV peak at pT ~ 2 GeV/c. In the pT range where
> recombination is expected to dominate, the p/pi+ ratios at
> 62.4 GeV are larger than at 200 GeV, while the pbar/pi-
> ratios are smaller. For pT > 2 GeV/c, the pbar/pi- ratios at
> the two beam energies are independent of pT and centrality
> indicating that the shape of the pbar/pi- ratio does not
> change between 62.4 and 200 GeV. These findings challenge
> various models incorporating jet quenching and/or constituent
> quark coalescence.
>
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