A model-independent confirmation of the $Z(4430{)}^{-}$ state

Abstract

The decay $B^0\to \psi (2S)K^{+}{\pi }^{-}$ is analyzed using $3\mathrm{f}{\mathrm{b}}^{-1}$ of $pp$ collision data collected with the LHCb detector. A model-independent description of the $\psi (2S)\pi$ mass spectrum is obtained, using as input the $K\pi$ mass spectrum and angular distribution derived directly from data, without requiring a theoretical description of resonance shapes or their interference. The hypothesis that the $\psi (2S)\pi$ mass spectrum can be described in terms of $K\pi$ reflections alone is rejected with more than 8$\sigma$ significance. This provides confirmation, in a model-independent way, of the need for an additional resonant component in the mass region of the $Z(4430{)}^{-}$ exotic state.

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2015-038.html

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• Observation of a resonance-like structure in the pi^+- psi' mass distribution in exclusive B-->K pi^+- psi' decays
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• Partners of Z(4430) and Productions in B Decays
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• Bottomed Analog of Z+(4433)
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