Dalitz plot analyses of $B^0 \to D^- D^0 K^+$ and $B^+ \to \overline{D}^0 D^0 K^+$ decays

TL;DR

This paper performs Dalitz plot analyses of specific B meson decays, discovering a new resonance and an unexplained enhancement in the invariant mass spectrum, based on a large dataset collected at BaBar.

Contribution

It reports the observation of the $D^{*}_{s1}(2700)^+$ resonance and an unexplained mass enhancement in B meson decays, providing new measurements and insights into these decay channels.

Findings

Observation of $D^{*}_{s1}(2700)^+$ resonance with measured mass and width.

Detection of an unexplained enhancement in the $D^0K^+$ invariant mass spectrum.

Analysis based on 429 fb$^{-1}$ of data with 471 million B pairs.

Abstract

We present Dalitz plot analyses for the decays of $B$ mesons to $D^- D^0 K^+$ and $\overline{D}^0 D^0 K^+$. We report the observation of the $D^{*}_{s1}(2700)^+$ resonance in these two channels and obtain measurements of the mass $M(D^{*}_{s1}(2700)^+) = 2699 {}^{+14}_{-7} \, \mathrm{MeV}/c^2$ and of the width $\Gamma(D^{*}_{s1}(2700)^+) = 127 {}^{+24}_{-19} \, \mathrm{MeV}$, including statistical and systematic uncertainties. In addition, we observe an enhancement in the $D^0K^+$ invariant mass around 2350--2500 MeV/$c^2$ in both decays $B^0 \to D^- D^0 K^+$ and $B^+ \to \overline{D}^0 D^0 K^+$, which we are not able to interpret. The results are based on $429~\mathrm{fb}^{-1}$ of data containing $471\times10^6\, B\overline{B}$ pairs collected at the $\Upsilon{(4S)}$ resonance with the BaBar detector at the SLAC National Accelerator Laboratory.