Charm and beauty production and polarization at CDF Page: 2 of 13
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1 Introduction
Charm, Beauty and heavy Quarkonia states, cc and bb, provide very useful systems
for the study of both perturbative and non perturbative QCD. The large production
of such states in pp colliders and the ability to trigger on them efficiently make
the Tevatron a unique place for such studies allowing the disentagling of various
production mechanisms.
From August 1992 to February 1996, the CDF detector collected a data
sample of 110 pb-1 of pp collisions at V4 = 1.8 TeV and we refer to this period as
Run I. We refer to the period from 1992-93 (- 20 pb-1) as Run Ia and to the period
from 1994-1996 (- 90 pb-1) as Run Ib. The CDF detector is described in detail
elsewhere 1), 2). Here we describe some features of the detector, most relevant to
the analyses we discuss. CDF has good tracking and lepton ID for the pseudora-
pidity region jyj <1. The tracking system gives a transverse momentum resolution
SpT/pT = [(0.0009 x pT)2+(0.0066)2]1/2, where PT is in units of GeV/c. The average
track impact parameter resolution relative to the beam axis is (13 + (40/pT)) fim in
the plane transverse to the beam, for zl < 25 cm, the area covered by the Silicon
Vertex detector (SVX). Muon candidates consist of tracks in the central tracking
chamber matched to hits in muon chambers, located outside the calorimeter. Photon
candidates consist of an energy deposit in the central electromagnetic calorimeter,
matched to clusters in strip chambers embedded in the calorimeter.
This paper is organized as follows. In section 2 we describe results on
Charm and Beauty production, in section 3 we describe results on Quarkonia pro-
duction and their polarization and in section 4 we present conclusions and discuss
the future prospects.
2 Charm and Beauty Production
2.1 Charm Production
Here we describe the first measurement of the D*+(2010) meson production cross
section at the Tevatron. This measurement can probe into the charm-quark produc-
tion which has not been measured in hadronic collisions so far. For this analysis we
use the inclusive muon triggers from the Run Ib data set. We reconstruct D*+ events
via the decay chain D*+ -> D7rt, D0 -> K + X, where ir8 stands for "slow pion".
We identify D*+ by using the mass difference AM =M(Kp,rt)-M(Kp). For the
signal events or "Right Sign (RS)" events, the charge of the ir8 is the same as that of
the . The "Wrong Sign (WS)" events are defined as the ones for which the charge
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Papadimitriou, Vaia. Charm and beauty production and polarization at CDF, article, October 10, 2000; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc725289/m1/2/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.