[Brahms-l] Fw: New STAR Paper on Scaling Properties of Hyperon Production in AuAu at 200 GeV

FYI

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

phone: 631-344-4106
cell:       631-681-1596
fax:        631-344-1334
e-mail: videbaek @ bnl.gov
----- Original Message ----- 
From: "Timothy Hallman" <hallman@bnl.gov>
To: "'Bond, Peter D'" <bond@bnl.gov>; "William A Zajc" <zajc@bnl.gov>; "Videbaek, Flemming" <videbaek@bnl.gov>; "'Wit Busza'" 
<busza@MIT.EDU>
Cc: "Hallman" <hallman@bnl.gov>
Sent: Wednesday, May 10, 2006 2:49 PM
Subject: New STAR Paper on Scaling Properties of Hyperon Production in AuAu at 200 GeV


>
> Dear Peter, Bill, Flemming, and Wit:
>
> It is my pleasure to announce STAR's intention to submit the
> following paper to Physical Review Letters in one week's time:
>
> "Scaling Properties of Hyperon Production in Au+Au
> Collisions at \sqrt{s_{NN}} = 200 GeV".
>
> The abstract is enclosed.
>
>                            Sincerely,
>
>                            Tim Hallman
>
>
> We present the scaling properties of $\Lambda$, $\Xi$, $\Omega$ and
> their anti-particles produced at mid-rapidity in $Au+Au$ collisions at
> RHIC at $\sqrt{s_{NN}}$ = 200 GeV.  The yield of multi-strange baryons
> per participant nucleon increases from peripheral to central
> collisions more rapidly than the $\Lambda$ yield, which appears to
> correspond to an increasing strange quark density of matter produced.
> The value of the strange phase space occupancy factor $\gamma_{s}$,
> obtained from a thermal model fit to the data, approaches unity for the
> most central collisions. We also show that the nuclear modification
> factors, $R_{CP}$, of $\Lambda$ and $\Xi$ are consistent with each
> other and with that of protons in the transverse momentum range 2.0 $<
> p_T <$ 5.0 GeV/c. This scaling behaviour is consistent with a scenario
> of hadron formation from constituent quark degrees of freedom through
> quark recombination or coalescence.
> 

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