Phenomenology of Heavy Flavor Production Page: 2 of 14
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1. Introduction
The specification of reliable cross sections for heavy quarks, including their production
spectra in longitudinal and transverse momentum, and comparisons with data test the
quantum chromodynamic (QCD) mechanisms by which all heavy objects are expected
to be produced. Strategies in the search for new flavors such as top are predicated on
best estimates of cross sections and of momentum distributions in phase space not only of
the new flavor but, perhaps more importantly, of lighter flavors which contribute deceptive
backgrounds. Those considering hadronic experiments to establish flavor-antiflavor mixing
and possible CP violation require a detailed understanding of expected production spectra.
A significant result reported during the past year was the completion [11 of a calcu-
lation of the heavy flavor production cross section through order a in QCD perturbation
theory. Here a; is the running coupling strength in QCD. Explicit comparisons with data
have also been made [2,3]. In this paper I will summarize comparisons of the O(a;) cross
sections with data on hadroproduction of charm and bottom. The O(a') contributions are
larger in many cases of interest than the O(a;) terms. Not yet available are O(a;) dis-
tributions in transverse momentum for values of transverse momentum pTQ greater than
the quark mass mq. These are eagerly awaited inasmuch as the O(a;) QQ jet contribu-
tions provide different event topologies [4,51 and may be very much larger than the O(a)
contributions when pTQ > mQ. These distributions are important, especially at collider
energies, for a proper estimation of the bottom quark background to a possible top quark
signal.
In Section 2, I provide a brief summary of the results of the O(a;) computation.
Comparisons with data on charm production and on bottom production are presented in
Secs. 3 and 4. Comments on top quark production are made in Sec. 5, and conclusions are
summarized in Sec. 6.
2. Total Cross Sections
In hadron hadron interactions, the lowest order parton-parton subprocesses leading to
production of a pair of heavy quarks are fl -+ QQ and gg -+ QQ. The square of the1
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Berger, E. L. Phenomenology of Heavy Flavor Production, article, October 13, 1988; Argonne, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1212923/m1/2/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.