TY - JOUR

T1 - [Formula Presented] decay in perturbative QCD

AU - Chou, Chung Hsien

AU - Shih, Hsien Hung

AU - Lee, Shih Chang

AU - Li, Hsiang nan

PY - 2002

Y1 - 2002

N2 - We calculate the amplitudes involved in the heavy baryon nonleptonic decay (Formula presented) using perturbative QCD factorization theorem, which is expressed as convolutions of hard b quark decay amplitudes with the (Formula presented) baryon, (Formula presented) baryon, and (Formula presented) meson distribution amplitudes. It is found that nonfactorizable contributions dominate over factorizable ones. Because of the soft cancellation in pairs of nonfactorizable diagrams, the (Formula presented) decay is characterized by a large scale, such that perturbative QCD is applicable. Employing the distribution amplitudes determined in our previous works and from QCD sum rules, we derive the branching ratio (Formula presented)–(Formula presented) in agreement with data. We predict an asymmetry parameter (Formula presented) to (Formula presented) associated with the anisotropic angular distribution of the (Formula presented) baryons produced in polarized (Formula presented) baryon decays.

AB - We calculate the amplitudes involved in the heavy baryon nonleptonic decay (Formula presented) using perturbative QCD factorization theorem, which is expressed as convolutions of hard b quark decay amplitudes with the (Formula presented) baryon, (Formula presented) baryon, and (Formula presented) meson distribution amplitudes. It is found that nonfactorizable contributions dominate over factorizable ones. Because of the soft cancellation in pairs of nonfactorizable diagrams, the (Formula presented) decay is characterized by a large scale, such that perturbative QCD is applicable. Employing the distribution amplitudes determined in our previous works and from QCD sum rules, we derive the branching ratio (Formula presented)–(Formula presented) in agreement with data. We predict an asymmetry parameter (Formula presented) to (Formula presented) associated with the anisotropic angular distribution of the (Formula presented) baryons produced in polarized (Formula presented) baryon decays.

UR - http://www.scopus.com/inward/record.url?scp=85038307714&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.65.074030

DO - 10.1103/PhysRevD.65.074030

M3 - 期刊論文

AN - SCOPUS:85038307714

SN - 1550-7998

VL - 65

SP - 15

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

IS - 7

ER -