A broad peaking structure is observed in the dimuon spectrum of B+ -> K+mu(+)mu(-) 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+mu(+)mu(-) 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 psi(4160) meson. First observations of both the decay B+ -> psi(4160)K+ and the subsequent decay psi(4160) -> mu(+)mu(-) are reported. The resonant decay and the interference contribution make up 20% of the yield for dimuon masses above 3770 MeV/c(2). This contribution is larger than theoretical estimates.

Observation of a Resonance in B+ -> K+mu(+)mu(-) Decays at Low Recoil / R., A., B., A., M., A., C., A., A., A., Z., A., J., A., F., A., M., A., S., A., G., A., P. A., C., S., A., S., A., Y., A., L., A., J., A., R., A., J. E., A., R. B., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 111:11(2013). [10.1103/physrevlett.111.112003]

Observation of a Resonance in B+ -> K+mu(+)mu(-) Decays at Low Recoil

SARTI, ALESSIO;SCIUBBA, Adalberto;
2013

Abstract

A broad peaking structure is observed in the dimuon spectrum of B+ -> K+mu(+)mu(-) 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+mu(+)mu(-) 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 psi(4160) meson. First observations of both the decay B+ -> psi(4160)K+ and the subsequent decay psi(4160) -> mu(+)mu(-) are reported. The resonant decay and the interference contribution make up 20% of the yield for dimuon masses above 3770 MeV/c(2). This contribution is larger than theoretical estimates.
2013
01 Pubblicazione su rivista::01a Articolo in rivista
Observation of a Resonance in B+ -> K+mu(+)mu(-) Decays at Low Recoil / R., A., B., A., M., A., C., A., A., A., Z., A., J., A., F., A., M., A., S., A., G., A., P. A., C., S., A., S., A., Y., A., L., A., J., A., R., A., J. E., A., R. B., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 111:11(2013). [10.1103/physrevlett.111.112003]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/560406
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