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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/221337
First Observation of a Doubly Charged Tetraquark and Its Neutral Partner
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A combined amplitude analysis is performed for the decays B0 → D0 Dþ s π− and Bþ → D−Dþ s πþ, which are related by isospin symmetry. The analysis is based on data collected by the LHCb detector in protonproton 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 Dþ s πþ and Dþ s π− respectively. The former state indicates the first observation of a doubly charged open-charm tetraquark state with minimal quark content ½csu¯ d¯, and the latter state is a neutral tetraquark composed of ½cs¯ u d¯ quarks. Both states are found to have spin-parity of 0þ, and their resonant parameters are consistent with each other, which suggests that they belong to an isospin triplet.
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GRAUGÉS POUS, Eugeni, VAZQUEZ GOMEZ, Ricardo, MARIN BENITO, Carla, MAURICIO FERRE, Joan, ALFONSO ALBERO, Alejandro, GARCIA MORENO, Paula, GARRIDO BELTRÁN, Lluís, GIRONELLA GIRONELL, Pere, GOMEZ FERNANDEZ, Sergio, LOBO SALVIA, Aniol, LÓPEZ HUERTAS, Albert, LHCb Collaboration. First Observation of a Doubly Charged Tetraquark and Its Neutral Partner. _Physical Review Letters_. 2023. Vol. 131, núm. 4. [consulta: 5 de abril de 2026]. ISSN: 0031-9007. [Disponible a: https://hdl.handle.net/2445/221337]