Review of heavy-quark production at fixed-target experiments Page: 4 of 18
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Table 2: New Heavy-Quark Production Results for This Conference
E690 Diffractive Production of D*
E771 c and b Production by Protons
E791 D* Production: xF,pt, Polarization, Asymmetry
E791 Ac Production Polarization and Asymmetry
E781/SELEX Production Asymmetries
E831/FOCUS Charm Particle Correlations
E815/NuTeV Neutrino Production of Charm
E866 J/b, b', and T Production and A-Dependence
3 Heavy-Quark Production Mechanisms and Measurements
Heavy-quark production is interesting for two reasons. First, the lifetime and
uniqueness of the flavor of heavy quarks allows us to follow the progress of a
single quark from its production to its emergence as a fully developed hadron
observable in the laboratory. Thus, we can probe the time development of
hadronic processes involving heavy quarks. Secondly, since the production of
heavy quarks by photons and hadrons is so dominated by the gluon content of
projectiles (via photon-gluon fusion in photoproduction and gluon-gluon fusion
in hadroproduction), the study of heavy-quark production allows the investi-
gation of the gluon content of incident hadrons, both the mesons and baryons
in beams and the nucleons in targets. In the case of neutrino interactions, the
production of charm is dominated by W-exchange off strange quarks in the
nuclear sea. Thus, we can also learn about strange sea quark distributions in
nucleons. In addition, charm production in neutrino Deep Inelastic Scatter-
ing is an important ingredient in tests of two-scale perturbative QCD, the two
scales being the charm mass and AQCD.
We have implicitly assumed that the production process can be divided
into separate considerations of the incident partons, their inelastic interaction
producing heavy quarks, and the hadronization process of these quarks. This
division is referred to as factorization. In the following discussion, each obser-
vation will be relevant to one part of the factorized process.
In heavy quark production at fixed-target energies, a single process tends
to dominate. For charm quark production, these processes are neutrino-strange-
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Appel, Jeffrey A. Review of heavy-quark production at fixed-target experiments, article, December 11, 2000; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc723595/m1/4/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.