Amplitude analysis of B þ → J = ψφ
semanticscholar(2017)
Abstract
R. Aaij et al. (LHCb Collaboration) (Received 25 June 2016; published 11 January 2017) The first full amplitude analysis of Bþ → J=ψφKþ with J=ψ → μþμ−, φ → KþK− decays is performed with a data sample of 3 fb−1 of pp collision data collected at ffiffi s p 1⁄4 7 and 8 TeV with the LHCb detector. The data cannot be described by a model that contains only excited kaon states decaying into φKþ, and four J=ψφ 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 Xð4140Þ state. The model includes significant contributions from a number of expected kaon excitations, including the first observation of the K ð1680Þþ → φKþ transition.
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