Searching for possible evidences of new physics in $B\to V_1 V_2$

TL;DR

This paper investigates B meson decays into vector mesons with transverse polarization, evaluating T-odd operators and exploring potential signs of new physics through phase discrepancies and polarization measurements.

Contribution

It explicitly evaluates T-odd scalar operators involving spins in B decays, providing new insights into T-violating observables and potential indications of physics beyond the Standard Model.

Findings

Experimental phase difference $ eq 0$, indicating possible new physics.

Discrepancy in transverse polarized branching ratio for $B^0 o K^{*0} \, \omega$.

Theoretical prediction $ ext{Delta} \phi_p=0$ contrasts with experimental data.

Abstract

We explore the decays of $B\to V_1V_2$ ($V_{1,2}= (\rho, \omega,K^*, \phi)$ and $B= (B^0, B^+,B_s)$) with transverse polarizations. We explicitly evaluate the eigenstates of T-odd scalar operators involving spins for the first time, which offer physical insight among the T violating observables. Based on the helicity suppression of tree operators for transverse polarizations in the standard model (SM), we deduce that $\Delta \phi _p= \Delta \phi_\parallel - \Delta \phi_\perp=0$ with $\Delta\phi_{\perp,\parallel}$ the weak phases of the transverse amplitudes. In contrast, the experiments show that $\Delta \phi _p (B^0 \to K^{*0} \omega)= -0.84\pm 0.54$, which could be a signal of new physics. There is also a discrepancy between our result in the SM and the experimental data for the transverse polarized branching ratio in $B^0 \to K^{*0} \omega$. In addition, by counting the helicity flips, we argue that $\sin(\phi_\parallel - \phi_\perp ) \approx 0$, which meets well with most of the experiments except for the ones with $B^0\to K^{*0}\omega$, where $\phi_{\parallel,\perp}$ are the strong phases in the transverse amplitudes.