[Brahms-l] Fw: New STAR paper on high pt particle production in d+Au

FYI

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


Subject: New STAR paper on high pt particle production in d+Au


> Dear Peter, Bill, 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:
> 
> 
> "Rapidity and species dependence of particle production at large
> transverse momentum for d+Au collisions at roots_NN = 200 GeV"
> 
> The abstract is enclosed.
> 
>                         Sincerely,
> 
>                         Tim Hallman
> 
> Abstract:
> 
> We determine rapidity asymmetry in the production of
> charged pions, protons and anti-protons for large transverse
> momentum (pT) for d+Au collisions at \sqrt{s_{NN} = 200 GeV.
> The identified hadrons are measured in the rapidity regions
> |y| < 0.5 and 0.5 < |y| < 1.0 for the pT range 2.5 < pT < 10
> GeV/c. We observe  significant rapidity asymmetry for charged pion
> and proton+anti-proton production in both rapidity regions.
> The asymmetry is larger for 0.5 < |y| < 1.0 than for |y|< 0.5
> and is almost independent of particle type. The measurements
> are compared to various model predictions employing multiple
> scattering, energy loss, nuclear shadowing, saturation effects,
> and recombination, and also to a phenomenological parton model.
> We find that asymmetries are sensitive to model parameters
> and show model-preference. The rapidity dependence of
> \pi^{-}/\pi^{+} and \bar{p}/p ratios in peripheral d+Au and
> forward neutron-tagged events are used to study the contributions
> of valence quarks and gluons to particle production at
> high pT. The results are compared to calculations based on NLO
> pQCD and other measurements of quark fragmentation functions.
> 
>
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