2016/06/30 by LHCb collaboration, R. Aaij, B. Adeva +751 · 2 citations
Physics and Astronomy · #hep-ex
paper · pdf · doi:10.1103/physrevlett.118.022003
published as Phys. Rev. Lett. 118, 022003 (2017) · 17 pages, 3 figures
arxiv created 2017/01/14 · arxiv updated 2017/01/17
The first full amplitude analysis of B+→ J/ψϕK+ with J/ψ→μ+μ-, ϕ→ K+K- decays is performed with a data sample of 3 fb-1 of pp collision data collected at √(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 ϕK+, 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 X(4140) state.