Search for new physics in B -> VV decays and other hot topics from Belle

Abstract

We report studies in polarization in B decay into two vector mesons with data equivalent to $253\mathrm{f}{\mathrm{b}}^{-1}$ on ${\rm Y}(4S)$ resonance at KEKB. In $B^0\to \varphi K^{\ast 0}$, $B^{+}\to \varphi K^{\ast +}$ and $B^{+}\to {\rho }^{+}{K}^{\ast 0}$ decays, we determine $f_L=0.45\pm 0.05(stat.)\pm 0.02(syst.)$, $f_L=0.52\pm 0.08(stat.)\pm 0.03(syst.)$ and $f_L=0.43\pm 0.11(stat.{)}_{-0.02}^{+0.05}(syst.)$ respectively, where $f_L$ is a ratio between longitudinal and transverse polarization, and a naïve theoretical estimation assumes $f_L\sim 1$. The discrepancy from 1 in $f_L$ may suggest existence of new amplitude within or/and beyond the Standard Model.

arXiv comment8pages, 7figures, XXXXth Rencontres De Moriond On Electroweak Interactions And Unified Theories