Study of Polarization in B -> VT Decays
Abstract
In this paper, we examine B -> VT decays (V is a vector and T is a tensor meson), whose final-state particles can have transverse or longitudinal polarization. Measurements have been made of B -> \phi K_2^*, and it is found that fT/fL is small, where fT (fL) is the fraction of transverse (longitudinal) decays. We find that the standard model (SM) naively predicts that fT/fL << 1. The two extensions of the naive SM which have been proposed to explain the large fT/fL in B -> \phi K^* -- penguin annihilation and rescattering -- make no firm predictions for the polarization in B -> \phi K_2^*. The two new-physics scenarios, which explain the data in B -> \pi K and the \phi (\rho) K^* polarization measurements, can reproduce the fT/fL data in B -> \phi K_2^* only if the B -> T form factors obey a certain hierarchy. Finally, we present the general angular analysis which can be used to get helicity information using two- and three-body decays.
Cite
@article{arxiv.0711.2107,
title = {Study of Polarization in B -> VT Decays},
author = {Alakabha Datta and Yanyan Gao and Andrei V. Gritsan and David London and Makiko Nagashima and Alejandro Szynkman},
journal= {arXiv preprint arXiv:0711.2107},
year = {2008}
}
Comments
15 pages, latex, 3 figures (enclosed), several changes made, conclusions unchanged, publication info added