Branching ratios and CP asymmetries of B decays to a vector and a pseudoscalar meson

We study the non-leptonic two-body decays of D mesons decaying into one pseudoscalar meson (P) and one vector meson (V) in the factorization-asisted topological-amplitude approach. In this approach, the decay amplitudes are factorized into two parts, the short-distance contribution (Wilson coefficients) and the long-distance contribution (hadronic matrix elements). We predict the branching ratios of D → PV decays using a global fit with the non-perturbative parameters. Our results agree well with the experimental data. We also predict the direct CP asymmetries by combining short-distance dynamics associated with penguin operators and long-distance hadronic matrix elements determined by branching ratios. The large asymmetries in D+ → π+ρ0 and [Formula: see text] may be measurable in the LHCb and future Belle II experiments.

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LARGE SU(3) BREAKING EFFECTS AND CP VIOLATION IN B+ DECAYS INTO THREE CHARGED OCTET PSEUDOSCALAR MESONS

International Journal of Modern Physics A ◽

10.1142/s0217751x14500110 ◽

2014 ◽

Vol 29 (03n04) ◽

pp. 1450011 ◽

Cited By ~ 22

Author(s):

DONG XU ◽

GUAN-NAN LI ◽

XIAO-GANG HE

Keyword(s):

Experimental Data ◽

Cp Violation ◽

Branching Ratios ◽

Lhcb Collaboration ◽

The Other ◽

Order Derivative ◽

B Decays ◽

Pseudoscalar Mesons ◽

Cp Asymmetries

The LHCb collaboration has recently reported evidence for nonzero CP asymmetries in B+ decays into π+K+K-, π+π+π-, K+K+K- and K+π+π-. The branching ratios for these decays have also been measured with different values ranging from 5×10-6 to 51×10-6. If flavor SU(3) symmetry is a good symmetry for B decays, in the case that the dominant amplitude is momentum independent it is expected that branching ratios Br and CP violating rate differences [Formula: see text] satisfy, Br (π+π+π-) = 2 Br (π+K+K-), Br (K+K+K-) = 2 Br (K+π+π-) and Δ CP (π+π+π-) = 2Δ CP (π+K+K-) = -Δ CP (K+K+K-) = -2Δ CP (K+π+π-). The experimental data do not exhibit the expected pattern for the branching ratios. The rate differences for B+→π+π+π- and B+→K+ K+ K- satisfy the relation between ΔS = 0 and ΔS = 1 as well, but the other two do not, with the CP asymmetries having different signs than expected. In this paper, we study how to include momentum dependent and also SU(3) breaking effects on these decays to explain experimental data. We find that by including only the lowest order derivative terms, in the SU(3) limit, the decay patterns cannot be explained. Large SU(3) breaking effects are needed to explain the data.

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CHARMLESS HADRONIC B AND Bs DECAYS IN PERTURBATIVE QCD APPROACH

International Journal of Modern Physics A ◽

10.1142/s0217751x08041918 ◽

2008 ◽

Vol 23 (21) ◽

pp. 3250-3254 ◽

Cited By ~ 2

Author(s):

CAI-DIAN LÜ

Keyword(s):

Vector Meson ◽

Perturbative Qcd ◽

Branching Ratios ◽

Final States ◽

B Decays ◽

Breaking Effect ◽

Decay Channels ◽

Lhcb Experiment ◽

The Future ◽

Cp Asymmetries

We review the perturbative QCD approach study of hadronic B decays. Utilizing the constrained parameters in these well measured decay channels, we study most of the possible charmless Bs → PP, PV and VV decay channels in the perturbative QCD approach. In addition to the branching ratios and CP asymmetries, we also give predictions to the polarization fractions of the vector meson final states. The size of SU (3) breaking effect is also discussed. These predictions can be tested by the future LHCb experiment.

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