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oai:recercat.cat:20.500.14342/32982026-03-05T23:39:59Zcom_2072_482405com_2072_183628col_2072_482415

urn:hdl:20.500.14342/3298 Observation of a Resonance in B+→K+μ+μ− Decays at Low Recoil Calvo Gomez, Miriam Camboni, Alessandro Vilasis-Cardona, Xavier LHCb Collaboration - CERN Gran col·lisionador d'hadrons (França i Suïssa) Partícules (Física nuclear) Mesons A broad peaking structure is observed in the dimuon spectrum of B+→K+μ+μ− decays in the kinematic region where the kaon has a low recoil against the dimuon system. The structure is consistent with interference between the B+→K+μ+μ− decay and a resonance and has a statistical significance exceeding six standard deviations. The mean and width of the resonance are measured to be 4191+9−8  MeV/c2 and 65+22−16  MeV/c2, respectively, where the uncertainties include statistical and systematic contributions. These measurements are compatible with the properties of the ψ(4160) meson. First observations of both the decay B+→ψ(4160)K+ and the subsequent decay ψ(4160)→μ+μ− are reported. The resonant decay and the interference contribution make up 20% of the yield for dimuon masses above 3770  MeV/c2. This contribution is larger than theoretical estimates. 2013 2013-09-10 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.14342/3298 https://doi.org/10.1103/PhysRevLett.111.112003 eng Physical Review Letters, 2013, Vol. 111, No. 11 (Setembre) http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Attribution 4.0 International © CERN American Physical Society