TY - JOUR
T1 - First observation of a doubly charged tetraquark and its neutral partner
AU - LHCb Collaboration
AU - Bifani, Simone
AU - Calladine, Ryan
AU - Cooke, Naomi
AU - Johnson, Daniel
AU - Lazzeroni, Cristina
AU - Plews, Jonathan
AU - Sahoo, Niladribihari
AU - Slater, Mark
AU - Swallow, Paul
AU - Thompson, D. J. D.
AU - Watson, Nigel
N1 -
All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-026.html (LHCb public pages)
PY - 2023/7/27
Y1 - 2023/7/27
N2 - 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.
AB - 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.
KW - hep-ex
UR - https://journals.aps.org/prl/
U2 - 10.1103/PhysRevLett.131.041902
DO - 10.1103/PhysRevLett.131.041902
M3 - Article
SN - 0031-9007
VL - 131
JO - Physical Review Letters
JF - Physical Review Letters
M1 - 041902
ER -