[Brahms-l] Fw: New PHENIX Paper on Charm Production in 200 GeV Au+Au Collisions

FYI
----------------------------------------------------------------
Flemming Videbaek
Physics Department
Brookhaven National Laboratory

e-mail: videbaek@bnl.gov
phone: 631-344-4106
----- Original Message ----- 
From: "W.A. Zajc" <zajc@nevis.columbia.edu>
To: "Thomas Kirk" <tkirk@bnl.gov>; "Wit Busza" <busza@mit.edu>; "'Tim
Hallman'" <hallman@bnl.gov>; "'Videbaek, Flemming'" <videbaek@bnl.gov>
Sent: Tuesday, September 21, 2004 6:13 PM
Subject: New PHENIX Paper on Charm Production in 200 GeV Au+Au Collisions


> Dear Tom, Wit, Tim and Flemming:
>
> The PHENIX Collaboration intends to submit in approximately one week's
time
> a manuscript to Physical Review Letters on our analysis of single-electron
> production in 200 GeV Au+Au collisions. The title and abstract are
included
> below.
>
> Best regards,
>
> Bill
>
>
============================================================================
> ======================
>
> Title: Centrality Dependence of Charm Production from Single Electrons
>        Measurement in Au+Au Collisions at $\sqrt{s_{NN}} = 200$ GeV
>
> Abstract: The PHENIX experiment has measured mid-rapidity transverse
> momentum spectra ($0.4 < p_T < 4.0$\,GeV/$c$) of single electrons as a
> function of centrality in Au+Au collisions at $\sqrt{s_{NN}} = 200$\,GeV.
> Contributions to the raw spectra from photon conversions and Dalitz decays
> of light neutral mesons are measured by introducing a thin (1.7\% $X_0$)
> converter into the PHENIX acceptance and are statistically removed. The
> subtracted ``non-photonic'' electron spectra are primarily due to the
> semi-leptonic decays of hadrons containing heavy quarks (charm and
bottom).
> For all centralities, charm production is found to scale with the nuclear
> overlap function, $T_{AA}$. For minimum-bias collisions the charm cross
> section per binary collision is  $N_{c\overline{c}}/T_{AA} = 622 \pm 57
{\rm
> \,(stat.)} \pm 160 {\rm \,(sys.)} \,\m $b.
>


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