# Observation of $J/\psi\phi$ structures consistent with exotic states from amplitude analysis of $B^+ \to J/\psi\phi K^+$ decays

LHCb Collaboration; Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2017). Observation of $J/\psi\phi$ structures consistent with exotic states from amplitude analysis of $B^+ \to J/\psi\phi K^+$ decays. Physical Review Letters, 118(2):022003.

## Abstract

The first full amplitude analysis of $B^+ \to J/\psi\phi K^+$ with $J/\psi \to \mu^+\mu^−$, $\phi \to K^+K^−$ decays is performed with a data sample of 3  fb$^{−1}$ of pp collision data collected at $\sqrt{s}$ = 7 and 8 TeV with the LHCb detector. The data cannot be described by a model that contains only excited kaon states decaying into $\phi K^+$, and four $J/\psi\phi$ structures are observed, each with significance over 5 standard deviations. The quantum numbers of these structures are determined with significance of at least 4 standard deviations. The lightest has mass consistent with, but width much larger than, previous measurements of the claimed X(4140) state.

## Abstract

The first full amplitude analysis of $B^+ \to J/\psi\phi K^+$ with $J/\psi \to \mu^+\mu^−$, $\phi \to K^+K^−$ decays is performed with a data sample of 3  fb$^{−1}$ of pp collision data collected at $\sqrt{s}$ = 7 and 8 TeV with the LHCb detector. The data cannot be described by a model that contains only excited kaon states decaying into $\phi K^+$, and four $J/\psi\phi$ structures are observed, each with significance over 5 standard deviations. The quantum numbers of these structures are determined with significance of at least 4 standard deviations. The lightest has mass consistent with, but width much larger than, previous measurements of the claimed X(4140) state.

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