The {bar B}{r_arrow}X{sub s}{gamma} photon spectrum
- Theory Group, Fermilab, P.O. Box 500, Batavia, Illinois 60510 (United States)
- Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario, M5S 1A7 (CANADA)
- Department of Physics, University of California at San Diego, 9500 Gilman Drive, La Jolla, California 92093-0319 (United States)
- California Institute of Technology, Pasadena, California 91125 (United States)
The photon energy spectrum in inclusive weak radiative {bar B}{r_arrow}X{sub s}{gamma} decay is computed to order {alpha}{sub s}{sup 2}{beta}{sub 0}. This result is used to extract a value for the heavy quark effective theory (HQET) parameter {bar {Lambda}} from the average {l_angle}1{minus}2E{sub {gamma}}/m{sub B}{r_angle}, and a value of the parameter {lambda}{sub 1} from {l_angle}(1{minus}2E{sub {gamma}}/m{sub B}){sup 2}{r_angle}. An accurate measurement of {l_angle}1{minus}2E{sub {gamma}}/m{sub B}{r_angle} can determine the size of the nonperturbative contributions to the {Upsilon}(1S) mass which cannot be absorbed into the {ital b} quark pole mass. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 355482
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 3 Vol. 60; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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