The first full amplitude analysis of B+ -> J/psi phi K+ with J/psi -> mu(+)mu(-) phi -> K+K- decays is performed with a data sample of 3 fb(-1) of pp collision data collected at root s = 7, 8 TeV with the LHCb detector. The data cannot be described by a model that contains only excited kaon states decaying into phi K+, 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. The model includes significant contributions from a number of expected kaon excitations including the first observation of the K*(1680)+ -> phi K+ transition.

Amplitude analysis of B+ -> J/psi phi K+ decays

Bonivento W.;Dettori F.;Lai A.;Manca G.;Oldeman R.;Saitta B.;
2017

Abstract

The first full amplitude analysis of B+ -> J/psi phi K+ with J/psi -> mu(+)mu(-) phi -> K+K- decays is performed with a data sample of 3 fb(-1) of pp collision data collected at root s = 7, 8 TeV with the LHCb detector. The data cannot be described by a model that contains only excited kaon states decaying into phi K+, 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. The model includes significant contributions from a number of expected kaon excitations including the first observation of the K*(1680)+ -> phi K+ transition.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11584/240339
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