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Observation of a New Excited <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>D</mml:mi><mml:mi>s</mml:mi><mml:mo>+</mml:mo></mml:msubsup></mml:math> Meson in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mi>D</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:msup><mml:mi>D</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml…
Using $pp$ collision data corresponding to an integrated luminosity of $5.4\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected with the LHCb detector at a center-of-mass energy of 13 TeV, the ${B}^{0}\ensuremath{\rightarrow}{D}^{\ensuremath{-}}{D}^{+}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ decay is studied. A new excited ${D}_{s}^{+}$ meson is observed decaying into the ${D}^{+}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ final state with large statistical significance. The pole mass …