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Title: Observation of a New Excited Ds+ Meson in B0 →d-D+K+π-Decays
Author: LHCb Collaboration
Garcia Moreno, P.
Garrido Beltrán, Lluís
Gironella Gironell, P.
Gomez Fernandez, S.
Graugés Pous, Eugeni
Lobo Salvia, A.
Mauricio, J.
Vazquez Gomez, R.
Marin Benito, Carla
Keywords: Hadrons
Gran Col·lisionador d'Hadrons
Física de partícules
Large Hadron Collider (France and Switzerland)
Particle physics
Issue Date: 2021
Publisher: American Physical Society
Abstract: Using pp collision data corresponding to an integrated luminosity of 5.4 fb−1 collected with the LHCb detector at a center-of-mass energy of 13 TeV, the B0 → D−DþKþπ− decay is studied. A new excited Dþ s meson is observed decaying into the DþKþπ− final state with large statistical significance. The pole mass and width, and the spin parity of the new state are measured with an amplitude analysis to be mR ¼ 2591 6 7 MeV, ΓR ¼ 89 16 12 MeV, and JP ¼ 0−, where the first uncertainty is statistical and the second systematic. Fit fractions for all components in the amplitude analysis are also reported. The new resonance, denoted as Ds0ð2590Þþ, is a strong candidate to be the Dsð21 S0Þþ state, the radial excitation of the pseudoscalar ground-state Dþ s meson.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2021, vol. 2021, p. 1-11
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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