Semi-inclusive decays {lambda}{sub b}{yields}X{sub c}+(D{sub s},D{sub s}*) at O(a{sub s}) including {lambda}{sub b} and D{sub s}* polarization effects

Journal Article · Mon Nov 01 00:00:00 EST 2004 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.70.094026· OSTI ID:20705620

Fischer, M; Groote, S; Koerner, J G; Mauser, M C ^[1]

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1. Institut fuer Physik, Johannes-Gutenberg-Universitaet Staudinger Weg 7, D-55099 Mainz (Germany)

In the leading order of the (1/m{sub b})-expansion in HQET the dominant contribution to the semi-inclusive decays of polarized {lambda}{sub b} baryons into the charm-strangeness mesons D{sub s} and D{sub s}* is given by the partonic process b({up_arrow}){yields}c+(D{sub s}{sup -},D{sub s}*{sup -}). Using standard values for the parameters of the process one expects a rather large branching ratio of {approx_equal}8% into these two channels. In the factorization approximation the semi-inclusive decay of a polarized {lambda}{sub b} is governed by three unpolarized and four polarized structure functions for which we determine the nonperturbative O(1/m{sub b}{sup 2}) corrections and the O({alpha}{sub s}) radiative corrections. We find that the perturbative and nonperturbative corrections amount to {approx_equal}10% and {approx_equal}3%, respectively. The seven structure functions can be measured through an analysis of the joint decay distributions of the process involving the polarization of the {lambda}{sub b} and the decays D{sub s}*{sup -}{yields}D{sub s}{sup -}+{gamma} and D{sub s}*{sup -}{yields}D{sub s}{sup -}+{pi}{sup 0} for which we provide explicit forms. We also provide numerical results for the Cabibbo-suppressed semi-inclusive decays {lambda}{sub b}{yields}X{sub u}+(D{sub s},D{sub s}*)

• OSTI ID: 20705620
• Journal Information: Physical Review. D, Particles Fields, Vol. 70, Issue 9; Other Information: DOI: 10.1103/PhysRevD.70.094026; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B QUARKS
BRANCHING RATIO
C QUARKS
D MESONS
D S MESONS
DISTRIBUTION
FACTORIZATION
HADRONIC PARTICLE DECAY
LAMBDA BARYONS
PARTICLE PRODUCTION
PARTON MODEL
PARTONS
PERTURBATION THEORY
PIONS NEUTRAL
POLARIZATION
RADIATIVE CORRECTIONS
STRANGENESS
STRUCTURE FUNCTIONS
T QUARKS