[Brahms-l] Fwd: STAR new paper on the energy and system size dependence of the forward rapidity photon production

FYI

Begin forwarded message:

> From: Nu Xu <NXu_at_lbl.gov>
> Date: June 4, 2009 2:17:29 AM EDT
> To: Barbara Jacak <jacak_at_skipper.physics.sunysb.edu>, Flemming  
> Videbaek <videbaek_at_bnl.gov>, wit Busza <busza_at_MIT.EDU>, Steven  
> Vigdor <vigdor_at_bnl.gov>
> Cc: Nu Xu <NXu_at_lbl.gov>
> Subject: STAR new paper on the energy and system size dependence of  
> the forward rapidity photon production
>
> Dear Barbara, Wit, Flemming and Steve,
>
> I am pleased to announce that the STAR collaboration will submit to  
> Physics Letters B, in one week's time,  a new paper
> on the energy and system size dependence of the forward rapidity  
> photon production 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: "Center of mass energy and system size dependence of photon  
> production at forward rapidity at RHIC"
>
> Abstract: "We present the multiplicity and pseudorapidity  
> distributions of photons produced in Au+Au and Cu+Cu collisions at
> $\sqrt{s_{NN}}$ = 62.4 and 200 GeV. The photons are measured in the  
> region -3.7 < $\eta$ < -2.3 using the photon multiplicity
> detector in the STAR experiment at RHIC. The number of photons  
> produced per average number of participating nucleon pairs
> increases with the beam energy and is independent of the collision  
> centrality. For collisions with similar average numbers of
> participating nucleons the photon multiplicities are observed to be  
> similar for Au+Au and Cu+Cu collisions at a given beam
> energy. The ratios of the number of charged particles to photons in  
> the measured pseudorapidity range are found to be
> 1.4 +/- 0.1 and 1.2 +/- 0.1 for $\sqrt{s_{NN}}$ = 62.4 GeV and 200  
> GeV, respectively. The energy dependence of this ratio could reflect  
> a varying contributions from baryons and mesons, while mesons are  
> the dominant contributors to photon production in the given  
> kinematic region. The photon pseudorapidity distributions normalized  
> by average number of participating nucleon pairs, when plotted as a  
> function of $\eta$-ybeam, are found to follow a longitudinal scaling  
> independent of centrality and colliding ion species at both beam  
> energies."

Flemming videbaek
videbaek @ bnl.gov
Brookhaven National Lab
631-344-4106
cell: 631-681-1596



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