Nonleptonic weak decays of bottom baryons

Journal Article · Mon Sep 01 04:00:00 EDT 1997 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.56.2799· OSTI ID:538707

Cheng, H ^[1]

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1. Institute of Physics, Academia Sinica, Taipei, Taiwan 115, Republic of (China)

Cabibbo-allowed two-body hadronic weak decays of bottom baryons are analyzed. Contrary to the charmed baryon sector, many channels of bottom baryon decays proceed only through the external or internal W-emission diagrams. Moreover, W exchange is likely to be suppressed in the bottom baryon sector. Consequently, the factorization approach suffices to describe most of the Cabibbo-allowed bottom baryon decays. We use the nonrelativistic quark model to evaluate heavy-to-heavy and heavy-to-light baryon form factors at zero recoil. When applied to the heavy quark limit, the quark model results do satisfy all the constraints imposed by heavy quark symmetry. The decay rates and up-down asymmetries for bottom baryons decaying into (1)/(2){sup +}+P(V) and (3)/(2){sup +}+P(V) are calculated. It is found that the up-down asymmetry is negative except for {Omega}{sub b}{r_arrow}(1)/(2){sup +}+P(V) decay and for decay modes with {psi}{sup {prime}} in the final state. The prediction B({Lambda}{sub b}{r_arrow}J/{psi}{Lambda})=1.6{times}10{sup {minus}4} for {vert_bar}V{sub cb}{vert_bar}=0.038 is consistent with the recent Collider Detector at Fermilab measurement. We also present estimates for {Omega}{sub c}{r_arrow}(3)/(2){sup +}+P(V) decays and compare with various model calculations. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 538707
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 5 Vol. 56; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ASYMMETRY
BEAUTY BARYONS
CHARMED BARYONS
FACTORIZATION
FERMILAB COLLIDER DETECTOR
FORM FACTORS
LAMBDA B NEUTRAL BARYONS
LAMBDA BARYONS
OMEGA BARYONS
QUARK MODEL
W MINUS BOSONS
W PLUS BOSONS
WEAK HADRONIC DECAY
XI BARYONS