First Observation of a Doubly Charged Tetraquark and Its Neutral Partner

(LHCb Collaboration)

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21 Citas (Scopus)


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.

Idioma originalInglés
Número de artículo041902
Número de páginas12
PublicaciónPhysical Review Letters
EstadoPublicada - 27 jul 2023


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