# 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.
Type de document :
Article dans une revue
Physical Review D, American Physical Society, 2015, 92, pp.112009. 〈10.1103/PhysRevD.92.112009〉

http://hal.in2p3.fr/in2p3-01213219
Contributeur : Sabine Starita <>
Soumis le : jeudi 8 octobre 2015 - 09:46:14
Dernière modification le : jeudi 18 janvier 2018 - 01:49:08

### Citation

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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