A combined amplitude analysis is performed for the decays B0 → anti-D0 Ds+ 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 [c anti-s u anti-d], and the latter state is a neutral tetraquark composed of [c anti-s anti-u d] 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.

Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudin{\'e}n, F., Ackernley, T., Adeva, B., et al. (2023). First Observation of a Doubly Charged Tetraquark and Its Neutral Partner. PHYSICAL REVIEW LETTERS, 131(4), 1-12 [10.1103/PhysRevLett.131.041902].

First Observation of a Doubly Charged Tetraquark and Its Neutral Partner

Carbone, A.;Ferrari, F.;Galli, D.;Manuzzi, D.;Patrignani, C.;Spedicato, E.;Villa, A.;Zucchelli, S.;
2023

Abstract

A combined amplitude analysis is performed for the decays B0 → anti-D0 Ds+ 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 [c anti-s u anti-d], and the latter state is a neutral tetraquark composed of [c anti-s anti-u d] 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.
2023
Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudin{\'e}n, F., Ackernley, T., Adeva, B., et al. (2023). First Observation of a Doubly Charged Tetraquark and Its Neutral Partner. PHYSICAL REVIEW LETTERS, 131(4), 1-12 [10.1103/PhysRevLett.131.041902].
Aaij, R.; Abdelmotteleb, A.S.W.; Abellan Beteta, C.; Abudin{\'e}n, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Afsharnia, H.; Agapopoulo...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/952738
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