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First observation of a doubly charged tetraquark and its neutral partner

A combined amplitude analysis is performed for the decays B0→¯¯¯D0D+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 13 TeV. The full data sample corresponds to...

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Main Authors: Aaij, Roel (Author) , Archilli, Flavio (Author) , Bachmann, Sebastian (Author) , Borsato, Martino (Author) , Caspary, Rowina (Author) , Frau, Giulia (Author) , Günther, Paul André (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Hu, Jiangqiao (Author) , Leverington, Blake (Author) , Li, Peilian (Author) , Marks, Jörg (Author) , Unverzagt, Daniel Joachim (Author) , Uwer, Ulrich (Author) , Witola, Lukas (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 27 July 2023
In: Physical review letters
Year: 2023, Volume: 131, Issue: 4, Pages: 1-12
ISSN:1079-7114
DOI:10.1103/PhysRevLett.131.041902
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.131.041902
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.131.041902
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Author Notes:R. Aaij et al. (LHCb Collaboration)*
Description
Summary:A combined amplitude analysis is performed for the decays B0→¯¯¯D0D+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 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 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 [c¯su¯d], and the latter state is a neutral tetraquark composed of [c¯s¯ud] 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.
Item Description:*LHCb Collaboration: R. Aaij, F. Archilli, S. Bachmann, M. Borsato, R. Caspary, G. Frau, P.A. Günther, X. Han, S. Hansmann-Menzemer, J. Hu, B. Leverington, P. Li, J. Marks, D.J. Unverzagt, U. Uwer, L. Witola, A. Zhelezov [und 1056 weitere Personen]
Gesehen am 31.01.2024
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.131.041902

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