First Observation of a Doubly Charged Tetraquark and Its Neutral Partner

(LHCb Collaboration)

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

A combined amplitude analysis is performed for the decays B0→D¯D0s+π- and B+→D-Ds+π+, which are related by isospin symmetry. 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 TeV. The full data sample corresponds to an integrated luminosity of 9 fb-1. Two new resonant states with masses of 2.908±0.011±0.020 GeV and widths of 0.136±0.023±0.013 GeV are observed, which decay to Ds+π+ and Ds+π- respectively. The former state indicates the first observation of a doubly charged open-charm tetraquark state with minimal quark content [cs¯ud¯], and the latter state is a neutral tetraquark composed of [cs¯ūd] quarks. Both states are found to have spin-parity of 0+, and their resonant parameters are consistent with each other, which suggests that they belong to an isospin triplet.

Original languageEnglish (US)
Article number041902
JournalPhysical Review Letters
Volume131
Issue number4
DOIs
StatePublished - Jul 28 2023

ASJC Scopus subject areas

  • General Physics and Astronomy

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