Observation of the resonant character of the Z(4430)- state

LHCb Collaboration, R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, J. Anderson, R. AndreassenM. Andreotti, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, A. Badalov, V. Balagura, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, S. Bifani, N. Farley, P. Griffith, P. Ilten, I. R. Kenyon, C. Lazzeroni, A. Mazurov, J. McCarthy, C. J. Parkinson, L. Pescatore, D. Popov, N. K. Watson

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Abstract

Resonant structures in B0 → ψ′πK+ decays are analyzed by performing a four-dimensional fit of the decay amplitude, using pp collision data corresponding to 3fb-1 collected with the LHCb detector. The data cannot be described with K+- resonances alone, which is confirmed with a model-independent approach. A highly significant Z(4430)- → ψ′π component is required, thus confirming the existence of this state. The observed evolution of the Z(4430)- amplitude with the ψ′π mass establishes the resonant nature of this particle. The mass and width measurements are substantially improved. The spin parity is determined unambiguously to be 1+.

Original languageEnglish
Article number222002
Number of pages9
JournalPhysical Review Letters
Volume112
Issue number22
DOIs
Publication statusPublished - 4 Jun 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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