Amplitude analysis of $B^0 \rightarrow \overline{D}^0 D_s^+ \pi^-$ and $B^+ \rightarrow D^- D_s^+ \pi^+$ decays

TL;DR

This paper performs an amplitude analysis of specific B meson decays to identify resonant contributions, revealing potential tetraquark states near 2.9 GeV using LHCb data.

Contribution

It introduces a combined amplitude analysis of B decays assuming isospin symmetry, discovering possible tetraquark candidates near 2.9 GeV.

Findings

Observation of a doubly charged spin-0 tetraquark candidate.

Identification of a neutral partner near 2.9 GeV.

Analysis based on 9 fb^{-1} of LHCb data.

Abstract

Resonant contributions in $B^0 \rightarrow \overline{D}^0 D^+_s\pi^-$ and $B^+\rightarrow D^- D^+_s\pi^+$ decays are determined with an amplitude analysis, which is performed both separately and simultaneously, where in the latter case isospin symmetry between the decays is assumed. The analysis is based on data collected by the LHCb detector in proton-proton collisions at center-of-mass energies of 7, 8 and 13 $\rm{TeV}$. The full data sample corresponds to an integrated luminosity of 9 $\rm fb^{-1}$. A doubly charged spin-0 open-charm tetraquark candidate together with a neutral partner, both with masses near $2.9\,\rm{GeV}$, are observed in the $D_s\pi$ decay channel.