Study of Polarization in B -> VT Decays

Details Study of Polarization in B -> VT Decays Study of Polarization in B -> VT Decays

2007-11-14

arxiv.org/abs/0711.2107v2

Phys.Rev.D77:114025,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, latex, 3 figures (enclosed), several changes made, conclusions unchanged, publication info added

Scientific paper

10.1103/PhysRevD.77.114025

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.

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