Observation of the resonant character of the Z(4430)(-) state.
Phys Rev Lett
; 112(22): 222002, 2014 Jun 06.
Article
em En
| MEDLINE
| ID: mdl-24949760
ABSTRACT
Resonant structures in B^{0}âψ^{'}π^{-}K^{+} decays are analyzed by performing a four-dimensional fit of the decay amplitude, using pp collision data corresponding to 3 fb^{-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)^{-}âψ^{'}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^{+}.
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MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2014
Tipo de documento:
Article
País de afiliação:
Holanda