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

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Abstract

Resonant structures in B0 -K+ 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+Ï€- resonances alone, which is confirmed with a model-independent approach. A highly significant Z(4430)- φπ- component is required, thus confirming the existence of this state. The observed evolution of the Z(4430)- amplitude with the Ïâ€Ï€- 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+. © 2014 CERN, for the LHCb Collaboration.

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Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Albrecht, J., … Zvyagin, A. (2014). Observation of the resonant character of the Z (4430)-state. Physical Review Letters, 112(22). https://doi.org/10.1103/PhysRevLett.112.222002

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