Perturbative QCD fragmentation functions as a model for heavy-quark fragmentation
- Theory Group, Fermilab, Batavia, Illinois 60510 (United States)
- Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208 (United States)
- Davis Institute for High Energy Physics, Department of Physics, University of California, Davis, California 95616 (United States)
The perturbative QCD fragmentation functions for a heavy quark to fragment into heavy-light mesons are studied in the heavy-quark limit. The fragmentation functions for {ital S}-wave pseudoscalar and vector mesons are calculated to next-to-leading order in the heavy-quark mass expansion using the methods of heavy-quark effective theory. The results agree with the {ital m}{sub {ital b}}{r_arrow}{infinity} limit of the perturbative QCD fragmentation functions for {ital {bar b}} into {ital B}{sub {ital c}} and {ital B}{sub {ital c}}{sup *}. We discuss the application of the perturbative QCD fragmentation functions as a model for the fragmentation of heavy quarks into heavy-light mesons. Using this model we predict the fraction {ital P}{sub {ital V}} of heavy-light mesons that are produced in the vector meson state as functions of the longitudinal momentum fraction {ital z} and the transverse momentum relative to the jet axis. The fraction {ital P}{sub {ital V}} is predicted to vary from about 1/2 at small {ital z} to almost 3/4 near {ital z}=1.
- Research Organization:
- Northwestern University
- DOE Contract Number:
- FG02-91ER40684; FG03-91ER40674
- OSTI ID:
- 44749
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 9 Vol. 51; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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