[Brahms-l] Fwd: STAR new paper on neutral pion production in Au+Au collisions at RHIC

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: Nu Xu <NXu_at_lbl.gov>
> Date: July 9, 2009 8:13:18 AM EDT
> To: jacak_at_skipper.physics.sunysb.edu, busza_at_MIT.EDU, vigdor_at_bnl.gov, videbaek_at_bnl.gov
> Cc: nxu_at_lbl.gov
> Subject: STAR new paper on neutral pion production in Au+Au  
> collisions at RHIC
>
> Dear Barbara, Wit, Flemming and Steve,
>
> I am pleased to announce that the STAR collaboration will submit to  
> Physical Review C,  in one week's time,  a new paper on neutral pion  
> production in Au+Au collisions at RHIC. The title and abstract are  
> included below.
>
> Best regards,
>
> Nu Xu
>
> -----------------------------------------------------------------------
> Nu Xu
>
> Build. 510A, I-181	    Phone:  (631)344-3471
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> -----------------------------------------------------------------------
>
> Title: "Neutral Pion Production in Au+Au Collisions at $ 
> \sqrt{s_{NN}} = 200 GeV"
>
> Abstract: "The results of mid-rapidity (0 < y < 0.8) neutral pion  
> spectra over an extended transverse momentum range (1 < $p_T$ < 12   
> GeV/c) in $\sqrt{s_{NN}}$ = 200 GeV Au+Au collisions, measured by  
> the STAR experiment, are presented. The neutral pions are  
> reconstructed from photons measured either by the STAR Barrel  
> Electro-Magnetic Calorimeter (BEMC) or by the Time Projection  
> Chamber (TPC) via tracking of conversion electron-positron pairs.  
> Our measurements are compared to previously published $\pi^{+/-}$  
> and $\pi^0$ results. The nuclear modification factors $R_{CP}$ and  
> $R_{AA}$ of $\pi^0$ are also presented as a function of $p_T$ . In  
> the most central Au+Au collisions,  the binary collision scaled $ 
> \pi^0$ yield at high $p_T$ is suppressed by a factor of about 5  
> compared to the expectation from the yield of p+p collisions. Such a  
> large suppression is in agreement with previous observations for  
> light quark mesons and is consistent with the scenario that partons  
> suffer con
> siderable energy loss in the dense medium formed in central nucleus- 
> nucleus collisions at RHIC."

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