[Brahms-l] Fwd: STAR new paper on Upsilon production in 200 GeV p+p collisions

FYI



> From: Nu Xu <NXu_at_lbl.gov>
> Date: January 9, 2010 10:44:21 AM EST
> 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 Upsilon production in 200 GeV p+p  
> collisions
>
> Dear Barbara, Wit, Flemming and Steve,
>
> I am pleased to announce that the STAR collaboration will submit to  
> Physical Review D,  in one week's time,  a new paper on Upsilon  
> production in 200 GeV p+p collisions at RHIC. The title and abstract  
> are included below.
>
> Best regards,
>
> Nu Xu
>
> -----------------------------------------------------------------------
> Nu Xu
>
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> -----------------------------------------------------------------------
>
> Title:  "Upsilon cross section in p+p collisions at $\sqrt{s}$ = 200  
> GeV"
>
> Abstract:  "We report on a measurement of the $\Upsilon$(1S+2S+3S) $ 
> \longrightarrow$ $e^{+}e^{-}$ cross section at midrapidity in p+p  
> collisions at $\sqrt{s}$ = 200 GeV. We find the cross section to be  
> 114 $\pm$ 38 (stat.)^{+23}_{-24} (syst.) pb. Perturbative QCD  
> calculations at next-to-leading order in the Color Evaporation Model  
> are in agreement with our measurement, while calculations in the  
> Color Singlet Model underestimate it. Our result is consistent with  
> the trend seen in world data as a function of the center-of-mass  
> energy of the collision and extends the availability of $\Upsilon$  
> data to RHIC energies. The dielectron continuum in the invariant  
> mass range near the $\Upsilon$ is also studied to obtain a combined  
> cross section of Drell-Yan plus $b-\bar{b}$ $\longrightarrow$  
> $e^{+}e^{-}$."



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