Heavy flavor physics at the Tevatron Page: 4 of 45
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In this paper we present a review of recent results obtained on the subject of heavy
flavour physics at the Tevatron pp collider at Fermilab. After a brief historical overview
in Section 2, we summarize the status of top quark physics at CDF and DP in Section
3. In particular we discuss the measurement of the top production cross section and the
world-average direct determination of the top quark mass. Section 4 is devoted to re-
cent B physics results at Tevatron collider, with emphasis on a preliminary, low statistic
measurement of the time dependent asymmetry in the decay B , B -+ J/K . We
will also discuss the observation of the BC meson. Finally, a brief out-look at the future
prospects for top quark physics as well as CP violation measurements in the b sector is
given in Section 5.
2 Historical Overview
Heavy flavor physics at the Tevatron Collider is synonymous with physics of the third
quark generation. Since the discovery of the T lepton' in 1976, the third quark gen-
eration has been the "most anticipated" quark family. At least part of the anticipation
was based on a theoretical arguments2 that explained the observed CP violation in the
K0 - K0 system3 through the existence of 3 quark families and an appropriate mixing
between the mass and the weak interaction eigenstates.
In 1977 the b quark was discovered as a dimuon resonance in 400 GeV proton-nucleus
collisions at Fermilab4 and soon after its discovery, the DORIS e+e- storage ring at
DESY5 confirmed the existence of the T resonances at a mass of about 9.5 GeV/c2.
These narrow resonances allowed the assignment of a charge -1/3 to the newly discov-
ered b quark.
The Standard Model (SM) is an anomaly free theory6 if and only if the sum of all the
left-handed fermion charges in a given family is null (EiQI + NcEqQ = 0, where N,
is the number of colored quarks, Q are the lepton charges and Qq are the quark charges
in a family). Therefore the -1/3 charge for the b quark and the existence of the T lep-
ton implied the existence of a b quark partner with a charge of +2/3. This partner is by
definition the top quark.
Similarly, in the SM, the b and top quark are members of a weak isospin doublet, and
further evidence for the existence of the top quark was produced by the weak isospin
measurement of the b quark, extracted from the forward-backward asymmetry AFB in
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Apollinari, G. Heavy flavor physics at the Tevatron, article, November 1, 1998; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc666509/m1/4/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.