Testing QCDF with phase determinations in $B \rightarrow K\pi, K\rho$ and $K^*\pi$ decays
Résumé
The success of QCD Factorization(QCDF) in predicting branching ratios for charmless B decays to light pseudo scalar and vector mesons and the small CP asymmetries measured at BaBar, Belle and LHCb show that the phase in these decays, as predicted by QCDF, are not large. For a precise test of QCDF one needs to extract from the measured decay rates, the phase in the interference terms between the I=3/2 tree and I=1/2 penguin amplitude. This is similar to the extraction of the final-state interaction phases in the interference term between pp‾→J/Ψ→e+e− and pp‾→e+e− and in J/Ψ→0−0− done previously. In this talk, I would like to present a determination of the phase between the I=3/2 tree and I=1/2 penguin amplitudes in B→Kπ,Kρ , and K⁎π decays obtained in a recent work using the measured decay rates and the QCDF for the I=3/2 tree amplitude. It is remarkable that the phase extracted from experiments differs only slightly from the QCDF values. This shows that there is no large final-state interaction strong phase in B→Kπ,Kρ , and K⁎π decays.
Mots clés
B --> K pi
B --> K rho(770)
B --> K*(892) pi
talk: Montpellier 2016/07/04
p p: scattering
p p: colliding beams
electron positron: annihilation
electron positron: colliding beams
decay rate: measured
B: hadronic decay
quantum chromodynamics: factorization
asymmetry: CP: measured
final-state interaction
interference
penguin
scattering amplitude
tree approximation
B: branching ratio
vector meson
BELLE
KEK-B
LHC-B
CERN LHC Coll
BaBar
SLAC PEP Stor
interpretation of experiments