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.

Observation of the resonant character of the Z (4430)-state / R. a., A., B., A., M., A., A., A., Z., A., J., A., F., A., M., A., S., A., G., A., P. A., C., A. a., A., S., A., S., A., Y., A., L., A.n., L., A., J., A., R., A., M., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 112:22(2014). [10.1103/physrevlett.112.222002]

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

G. Casse;SARTI, ALESSIO;SCIUBBA, Adalberto;
2014

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.
2014
physics; decay amplitudes; resonant structures; width measurements; atomic physics
01 Pubblicazione su rivista::01a Articolo in rivista
Observation of the resonant character of the Z (4430)-state / R. a., A., B., A., M., A., A., A., Z., A., J., A., F., A., M., A., S., A., G., A., P. A., C., A. a., A., S., A., S., A., Y., A., L., A.n., L., A., J., A., R., A., M., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 112:22(2014). [10.1103/physrevlett.112.222002]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/665053
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