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

Abstract : The decay $B^0\to \psi(2S) K^+\pi^-$ is analyzed using $\rm 3~fb^{-1}$ 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.
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http://hal.in2p3.fr/in2p3-01213219
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Submitted on : Thursday, October 8, 2015 - 9:46:14 AM
Last modification on : Monday, June 3, 2019 - 1:38:03 PM

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R. Aaij, Y. Amhis, S. Barsuk, M. Borsato, O. Kochebina, et al.. A model-independent confirmation of the $Z(4430)^-$ state. Physical Review D, American Physical Society, 2015, 92, pp.112009. ⟨10.1103/PhysRevD.92.112009⟩. ⟨in2p3-01213219⟩

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