Observation of a New Excited <i>D<sub>s</sub></i><SUP>+</SUP> Meson in <i>B</i><SUP>0</SUP> → <i>D</i><SUP>-</SUP> <i>D</i><SUP>+</SUP> <i>K</i><SUP>+</SUP> π<SUP>-</SUP> Decays

Aaij, R, Beteta, C Abellan, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Aidala, CA, Aiola, S, Ajaltouni, Z, Akar, S
et al (show 961 more authors) (2021) Observation of a New Excited <i>D<sub>s</sub></i><SUP>+</SUP> Meson in <i>B</i><SUP>0</SUP> → <i>D</i><SUP>-</SUP> <i>D</i><SUP>+</SUP> <i>K</i><SUP>+</SUP> π<SUP>-</SUP> Decays. PHYSICAL REVIEW LETTERS, 126 (12). 122002-.

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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 B^{0}→D^{-}D^{+}K^{+}π^{-} decay is studied. A new excited D_{s}^{+} meson is observed decaying into the D^{+}K^{+}π^{-} 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 m_{R}=2591±6±7  MeV, Γ_{R}=89±16±12  MeV, and J^{P}=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 D_{s0}(2590)^{+}, is a strong candidate to be the D_{s}(2^{1}S_{0})^{+} state, the radial excitation of the pseudoscalar ground-state D_{s}^{+} meson.

Item Type: Article
Additional Information: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-034.html (LHCb public pages)
Uncontrolled Keywords: LHCb Collaboration
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 21 Apr 2021 10:15
Last Modified: 05 Oct 2023 11:48
DOI: 10.1103/PhysRevLett.126.122002
Open Access URL: https://journals.aps.org/prl/pdf/10.1103/PhysRevLe...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3120037