Open charm from the electron data

• Background subtracted single electron spectra:

• Open charm contribution (scaled pp PYTHIA 6.152)

• Assuming no thermal radiation contrib. (virtual and/or real+conversion) Þ

• scharm (cent) = 380 ± 60 ± 200 mb (per NN coll.)

• b ® e (central)

• direct g ® e (conv.)

• Dashed band = NLO pQCD

• Electron spectrum/cross-section consistent

• with pp scaled charm production (i.e. no

• nuclear or medium effects), but with large

• uncertainties.