A study of the decay D0→K-π+μ+μ-is performed using data collected by the LHCb detector in proton-proton collisions at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 2.0 fb-1. Decay candidates with muon pairs that have an invariant mass in the range 675-875 MeV/c2are considered. This region is dominated by the ρ0and ω resonances. The branching fraction in this range is measured to beB(D0→K-π+μ+μ-)=(4.17±0.12(stat)±0.40(syst))×10-6. This is the first observation of the decay D0→K-π+μ+μ-. Its branching fraction is consistent with the value expected in the Standard Model.

Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., et al. (2016). First observation of the decay D0→K-π+μ+μ-in the ρ0-ω region of the dimuon mass spectrum. PHYSICS LETTERS. SECTION B, 757, 558-567 [10.1016/j.physletb.2016.04.029].

First observation of the decay D0→K-π+μ+μ-in the ρ0-ω region of the dimuon mass spectrum

BELLOLI, NICOLETTA;CALVI, MARTA;CARNITI, PAOLO;CASSINA, LORENZO;GOTTI, CLAUDIO;GRILLO, LUCIA;Martinelli, M;MATTEUZZI, CLARA;Petruzzo, M;
2016

Abstract

A study of the decay D0→K-π+μ+μ-is performed using data collected by the LHCb detector in proton-proton collisions at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 2.0 fb-1. Decay candidates with muon pairs that have an invariant mass in the range 675-875 MeV/c2are considered. This region is dominated by the ρ0and ω resonances. The branching fraction in this range is measured to beB(D0→K-π+μ+μ-)=(4.17±0.12(stat)±0.40(syst))×10-6. This is the first observation of the decay D0→K-π+μ+μ-. Its branching fraction is consistent with the value expected in the Standard Model.
Articolo in rivista - Articolo scientifico
Nuclear and High Energy Physics
English
558
567
10
Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., et al. (2016). First observation of the decay D0→K-π+μ+μ-in the ρ0-ω region of the dimuon mass spectrum. PHYSICS LETTERS. SECTION B, 757, 558-567 [10.1016/j.physletb.2016.04.029].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/154945
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