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Observation of the Resonant Character of the Z(4430) State

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. Lett. 112, 222002 – Published 4 June 2014
Physics logo See Synopsis: Four-Quark State Confirmed

Abstract

Resonant structures in B0ψπK+ decays are analyzed by performing a four-dimensional fit of the decay amplitude, using pp collision data corresponding to 3fb1 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)ψπ component is required, thus confirming the existence of this state. The observed evolution of the Z(4430) amplitude with the ψπ 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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  • Received 7 April 2014

DOI:https://doi.org/10.1103/PhysRevLett.112.222002

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2014 CERN, for the LHCb Collaboration

Synopsis

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Four-Quark State Confirmed

Published 4 June 2014

The LHCb experiment provides conclusive evidence for the existence of the four-quark particle called Z(4430).

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Vol. 112, Iss. 22 — 6 June 2014

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