Abstract
Resonant structures in B0 → ψ′π−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+-π- 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 language | English |
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Article number | 222002 |
Number of pages | 9 |
Journal | Physical Review Letters |
Volume | 112 |
Issue number | 22 |
DOIs | |
Publication status | Published - 4 Jun 2014 |
ASJC Scopus subject areas
- Physics and Astronomy(all)