Branching ratios, forward-backward asymmetry, and angular distributions of B{yields}K{sub 1}l{sup +}l{sup -} decays

Journal Article · Fri May 01 04:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.79.094024· OSTI ID:21308428

Runhui, Li ^[1]; Caidian, Lue ^[1]; Wei, Wang ^[1]

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1. Institute of High Energy Physics, P.O. Box 918(4), Beijing 100049 (China)

Using the B{yields}K{sub 1} form factors evaluated in the perturbative QCD approach, we study semileptonic B{yields}K{sub 1}(1270)l{sup +}l{sup -} and B{yields}K{sub 1}(1400)l{sup +}l{sup -} decays, where K{sub 1}(1270) and K{sub 1}(1400) are mixtures of K{sub 1A} and K{sub 1B} which are {sup 3}P{sub 1} and {sup 1}P{sub 1} states, respectively. Using the technique of helicity amplitudes, we express the decay amplitudes in terms of several independent and Lorentz invariant pieces. We study the dilepton invariant mass distributions, branching ratios, polarizations, and forward-backward asymmetries of B{yields}K{sub 1}l{sup +}l{sup -} decays. The ambiguity in the sign of the mixing angle will induce very large differences to branching ratios of semileptonic B decays: branching ratios without resonant contributions either have the order of 10{sup -6} or 10{sup -8}. But the polarizations and the forward-backward asymmetries are not sensitive to the mixing angles. We find that the resonant contributions will dramatically change the dilepton invariant mass distributions in the resonant region. We also provide the angular distributions of B{yields}K{sub 1}l{sup +}l{sup -}{yields}(K{pi}{pi})l{sup +}l{sup -} decays.

• OSTI ID: 21308428
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 79; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
ASYMMETRY
B MESONS
BRANCHING RATIO
DECAY AMPLITUDES
FORM FACTORS
HELICITY
K1-1270 MESONS
K1-1400 MESONS
LORENTZ INVARIANCE
MASS DISTRIBUTION
MIXTURES
PARTICLE DECAY
PERTURBATION THEORY
POLARIZATION
QUANTUM CHROMODYNAMICS
SEMILEPTONIC DECAY
WEINBERG ANGLE