Resolving the polarization puzzles in $D^0\to VV$

TL;DR

This paper analyzes $D^0 o VV$ decays and shows that final-state interactions can explain the polarization puzzles observed experimentally, offering predictions for future measurements at BESIII and LHCb.

Contribution

It provides a systematic analysis demonstrating that long-distance final-state interactions resolve polarization puzzles in $D^0 o VV$ decays, a novel explanation in this context.

Findings

FSIs explain polarization puzzles in $D^0 o VV$ decays

Additional measurable observables are proposed

Analysis supports long-distance mechanisms as key to understanding decay dynamics

Abstract

We carry out a systematic analysis of the Cabbibo-favored (CF) and singly Cabbibo-suppressed (SCS) decays of $D^0\to VV$, and demonstrate that the long-distance mechanism due to the final-state interactions (FSIs) can provide a natural explanation for these mysterious polarization puzzles observed in $D^0\to VV$ in experiments. More observables, which can be measured at BESIII and possibly at LHCb, are also suggested.