2008/01/31 by Wei Wang, Yu-Ming Wang, Deshan Yang +3 · 3 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.78.034011
published as Phys.Rev.D78:034011,2008 · 34 pages, revtex, 2 figures, published at PRD
openalex publication_date 2008/08/13 · arxiv created 2008/08/15 · arxiv updated 2009/12/01 · openalex created_date 2021/09/13 · openalex updated_date 2026/07/28
We provide the analysis of charmless two-body B\ensuremath→VP decays under the framework of the soft collinear effective theory (SCET), where V(P) denotes a light vector (pseudoscalar) meson. Besides the leading power contributions, some power corrections (chiraly enhanced penguins) are also taken into account. Using the current available B\ensuremath→PP and B\ensuremath→VP experimental data on branching fractions and CP asymmetry variables, we find two kinds of solutions in \ensuremathχ2 fit for the 16 nonperturbative inputs which are essential in the 87 B\ensuremath→PP and B\ensuremath→VP decay channels. Chiraly enhanced penguins can change several charming penguins sizably, since they share the same topology. However, most of the other nonperturbative inputs and predictions on branching ratios and CP asymmetries are not changed too much. With the two sets of inputs, we predict the branching fractions and CP asymmetries of other modes especially Bs\ensuremath→VP decays. The agreements and differences with results in QCD factorization and perturbative QCD approach are analyzed. We also study the time-dependent CP asymmetries in channels with CP eigenstates in the final states and some other channels such as B0/B0\ensuremath→\ensuremathπ^\ifmmode±\else\textpm\fi\ensuremathρ^\ensuremath∓ and Bs0/Bs0\ensuremath→K^\ifmmode±\else\textpm\fiK^*\ensuremath∓. In the perturbative QCD approach, the (S\ensuremath-P)(S+P) penguins in annihilation diagrams play an important role. Although they have the same topology with charming penguins in SCET, there are many differences between the two objects in weak phases, magnitudes, strong phases, and factorization properties.