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{−8}{+9} MeV/c^2 and 65{−16}{+22} MeV/c^2, 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.

Aaij, R., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., Ajaltouni, Z., et al. (2013). Observation of a Resonance in B+ → K+ μ+ μ− Decays at Low Recoil. PHYSICAL REVIEW LETTERS, 111(11), 1-8 [10.1103/PhysRevLett.111.112003].

Observation of a Resonance in B+ → K+ μ+ μ− Decays at Low Recoil

CARBONE, ANGELO;A. Di Canto;GALLI, DOMENICO;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2013

Abstract

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{−8}{+9} MeV/c^2 and 65{−16}{+22} MeV/c^2, 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
Aaij, R., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., Ajaltouni, Z., et al. (2013). Observation of a Resonance in B+ → K+ μ+ μ− Decays at Low Recoil. PHYSICAL REVIEW LETTERS, 111(11), 1-8 [10.1103/PhysRevLett.111.112003].
Aaij, R.; Adeva, B.; Adinolfi, M.; Adrover, C.; Affolder, A.; Ajaltouni, Z.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; Alvarez ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/175483
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