ミシマ　サトシ   MISHIMA Satoshi   三島　智    所属   埼玉医科大学  医学部 教養教育    職種   専任講師
論文種別	学術雑誌(原著)
言語種別	英語
査読の有無	査読あり
表題	Polarizations in B → VV decays
掲載誌名	正式名：Physical Review D
巻・号・頁	71,054025-1-054025-16頁
著者・共著者	Hsiang-nan Li,Satoshi Mishima
発行年月	2005/03/28
概要	We demonstrate that the polarization fractions of most tree-dominated B→VV decays can be simply understood by means of kinematics in the heavy-quark or large-energy limit. For example, the longitudinal polarization fractions RL of the B0→(Ds^{*+}, D^{∗+}, ρ^+)D^{∗−} and B^+→(Ds^{∗+}, D^{∗+}, ρ^+)ρ^0 modes increase as the masses of the mesons Ds^{∗+}, D^{∗+}, ρ^+ emitted from the weak vertex decrease. The subleading finite-mass or finite-energy corrections modify these simple estimates only slightly. Our predictions for the B→Ds^* D^∗ polarization fractions derived in the perturbative QCD framework, especially RL∼1 for B^0→Dbar^{∗0} D^{∗0} governed by nonfactorizable W-exchange amplitudes, can be confronted with future data. For penguin-dominated modes, such as B→ρ(ω) K^∗, the polarization fractions can be understood by the annihilation effect from the (S−P)(S+P) operators, plus the interference with a small tree amplitude. At last, we comment on the various mechanism proposed in the literature to explain the abnormal B→ϕ K^∗ polarization data, none of which are satisfactory.
DOI	10.1103/PhysRevD.71.054025
arXiv ID	hep-ph/0411146
ORCIDのPut Code	71016395
PermalinkURL	http://inspirehep.net/record/664211