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 13TeV, 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.
Highlights
Charm meson spectroscopy is of great theoretical and experimental interest as a testing ground for models based on quantum chromodynamics (QCD)
Ħ 1⁄4 c 1⁄4 1 are used, and the inclusion of charge-conjugate processes is implied throughout this Letter
Studies of B-meson decays have proven to provide excellent potential to discover new charm-strange mesons and measure their properties [12,13,14,15]. Most such studies to date, only address excited Dþs mesons decaying into a DK pair, and are only sensitive to Dþs states with natural spin parity (JP 1⁄4 0þ; 1−; 2þ; ...) due to parity conservation in strong decays
Summary
Charm meson spectroscopy is of great theoretical and experimental interest as a testing ground for models based on quantum chromodynamics (QCD). The DÆ candidates are required to have good vertex-fit quality and mass within Æ25 MeV of the known value [10].
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