First Observation of a Doubly Charged Tetraquark and Its Neutral Partnerстатья
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Дата последнего поиска статьи во внешних источниках: 20 февраля 2024 г.
Аннотация:A combined amplitude analysis is performed for the decays B0→D¯¯¯¯0D+sπ− and B+→D−D+sπ+, 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 13TeV. The full data sample corresponds to an integrated luminosity of 9fb−1. Two new resonant states with masses of 2.908±0.011±0.020GeV and widths of 0.136±0.023±0.011GeV are observed, which decay to D+sπ+ and D+sπ− 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¯u¯d] quarks. Both states are found to have spin-parity 0+, and their resonant parameters are consistent with each other, which suggests that they belong to an isospin triplet.