Charm (and Beauty) Production at the Tevatron.pdf

a r X i v : 0 7 1 1 .4 3 7 5 v 1 [ h e p - e x ] 2 8 N o v 2 0 0 7 Proceedings of the CHARM 2007 Workshop, Ithaca, NY, August 5-8, 2007 1 Charm (and Beauty) Production at the Tevatron Jonas Rademacker on behalf of the CDF and the D? Collaboration University of Bristol, H H Wills Physics Laboratory, Bristol, BS8 1TL, UK We present recent results on heavy flavour production at Tevatron Run II for typically ～ 1 fb?1 of analysed pp? data at √ s = 1.96TeV. This includes results on single and correlated open charm and bottom cross sections, charm pair production kinematics, J/ψ, ψ(2S) and χcJ cross sections and polarisation measurements in J/ψ, ψ(2S), Υ(1S), and Υ(2S). I. INTRODUCTION The large bb? and cc? cross section at √ s = 1.96TeV pp? makes the Tevatron a unique place for the study of the production and decay of heavy flavour. Al- ready in Run I, heavy flavour production measure- ments challenged theory, finding heavy flavour pro- duction cross sections significantly higher than pre- dicted by Next-to-Leading-Order (NLO) QCD calcu- lations (see for example [1] and [2]). The discrepancy between data and theory was particularly dramatic in the quarkonium production, where the “Colour Sin- glet Model” leading-order QCD calculation underes- timates the measured cross section by more than an order of magnitude (see e.g.[3]). Since the first hadroproduction measurements in Run I, a number of theoretical advances have been made. Fixed-Order Next to Leading Logarithm (FONLL) calculations [4], describe the open charm and b production cross sections well. Competing mod- els have been put forward that describe the observed quarkonium production rates and pT spectra well, but disagree on their results for quarkonium polarisation. There has also been dramatic experimental progress. In Run II, which started in 2001, the Teva- tron collides p and p? at unprecedented luminosity and energy, and the D? and the CDF experiment have undergone significant upgrades, many of them o