[Brahms-l] Fw: New STAR Paper Strange particle produciton in p+p collisions

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


Sent: Friday, July 21, 2006 4:47 PM
Subject: New STAR Paper Strange particle produciton in p+p collisions


> 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:
> 
> "Strange particle production in p+p collisions at root-s= 
> 200 GeV"
> 
> The abstract is enclosed.
> 
>                         Sincerely,
> 
>                         Tim Hallman
> 
> 
> Abstract:
> 
> We present strange particle spectra and yields measured at
> mid-rapidity in root-s=200 GeV proton-proton (p + p) 
> collisions at RHIC.  We find that the previously observed
> universal transverse mass (m_T equiv sqrt (p_T^2 + m^2)
> scaling of hadron production in p + p collisions seems to 
> break down at higher m_T and that there is a difference in 
> the shape of the m_T spectrum between baryons and mesons.
> We observe mid-rapidity and anti-baryon ratios near unity for 
> Lambda and Xi baryons and no dependence of the ratio on 
> transverse momentum, indicating that our data do not yet
> reach the quark-jet dominated region.  We show the 
> dependence of the mean transverse momentum (<p_T>) on
> measured charged particle multiplicity and on particle mass
> and infer that these trends are consistent with gluon-jet 
> dominated particle production.  The data are compared to
> previous measurements from CERN-SPS, ISR and FNAL 
> experiments and to Leading Order (LO) and NEXT to
> Leading Order (NLO) string fragmentation model predictions.
> We infer from these comparisons that the spectral shapes and
> particle yields from p + p collisions at RHIC energies have
> large contributions from gluon jets rather that quark jets.
>
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