The first observation of the D^0→π^+π^-μ^+μ^- and D^0→K^+K^-μ^+μ^- decays is reported using a sample of proton-proton collisions collected by LHCb at a center-of-mass energy of 8 TeV, and corresponding to 2 fb^-1 of integrated luminosity. The corresponding branching fractions are measured using as normalization the decay D^0→K^-π^+[μ^+μ^-]_ρ^0/ω, where the two muons are consistent with coming from the decay of a ρ^0 or ω meson. The results are B(D^0→π^+π^-μ^+μ^-)=(9.64±0.48±0.51±0.97)×10^-7 and B(D^0→K^+K^-μ^+μ^-)=(1.54±0.27±0.09±0.16)×10^-7, where the uncertainties are statistical, systematic, and due to the limited knowledge of the normalization branching fraction. The dependence of the branching fraction on the dimuon mass is also investigated.
Observation of D^0 Meson Decays to π^+π^-μ^+μ^- and K^+K^-μ^+μ^- Final States
Veltri, M;
2017
Abstract
The first observation of the D^0→π^+π^-μ^+μ^- and D^0→K^+K^-μ^+μ^- decays is reported using a sample of proton-proton collisions collected by LHCb at a center-of-mass energy of 8 TeV, and corresponding to 2 fb^-1 of integrated luminosity. The corresponding branching fractions are measured using as normalization the decay D^0→K^-π^+[μ^+μ^-]_ρ^0/ω, where the two muons are consistent with coming from the decay of a ρ^0 or ω meson. The results are B(D^0→π^+π^-μ^+μ^-)=(9.64±0.48±0.51±0.97)×10^-7 and B(D^0→K^+K^-μ^+μ^-)=(1.54±0.27±0.09±0.16)×10^-7, where the uncertainties are statistical, systematic, and due to the limited knowledge of the normalization branching fraction. The dependence of the branching fraction on the dimuon mass is also investigated.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
