Observation of B -> D^{(*)} K^- K^{0(*)} decays

TL;DR

This paper reports the first observation and measurement of specific B meson decay modes involving D^{(*)} and K^- K^{(*)0} final states, including detailed invariant mass and polarization analyses.

Contribution

It presents the first observation of B -> D^{(*)} K^- K^{(*)0} decays and measures their branching fractions, providing insights into decay dynamics and resonance contributions.

Findings

Significant signals for B -> D^{(*)} K^- K^{*0} and B^- -> D^0 K^- K^0_S decays.

Invariant mass and polarization distributions consistent with two-body B -> D^{(*)} a_1^-(1260) decays.

Branching fractions measured using 29.4 fb^{-1} of data from Belle detector.

Abstract

The B -> D^{(*)} K^- K^{(*)0} decays have been observed for the first time. The branching fractions of the B -> D^{(*)} K^- K^{(*)0} decay modes are measured. Significant signals are found for the B -> D^{(*)} K^- K^{*0} and B^- -> D^0 K^- K^0_S decay modes. The invariant mass and polarization distributions for the K^-K^{*0} and K^-K^0_S subsystems have been studied. For the K^-K^{*0} sybsystem these distributions agree well with those expected for two-body B -> D^{(*)} a_1^-(1260) decays, with a_1^-(1260) -> K^- K^{*0}. The analysis was done using 29.4 fb^{-1} of data collected with the Belle detector at the e^+ e^- asymmetric collider KEKB.