First observation of the decay $D^{0}\rightarrow K^{-}π^{+}μ^{+}μ^{-}$ in the $ρ^{0}$-$ω$ region of the dimuon mass spectrum

Journal article

A study of the decay $D^{0}\rightarrow K^{-}\pi^{+}\mu^{+}\mu^{-}$ 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$/c^2$ are considered. This region is dominated by the $\rho^{0}$ and $\omega$ resonances. The branching fraction in this range is measured to be ${\cal B}$($D^{0}\rightarrow K^{-}\pi^{+}\mu^{+}\mu^{-}$ ) = $( 4.17 \pm 0.12(stat) \pm 0.40(syst) )\times10^{-6}$. This is the first observation of the decay $D^{0}\rightarrow K^{-}\pi^{+}\mu^{+}\mu^{-}$. Its branching fraction is consistent with the value expected in the Standard Model.

Authors: LHCb Collaboration; Aaij, R; Beteta, C; Adeva, B; Adinolfi, M

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Elsevier
• Journal: Physics Letters B
• Volume: 757
• Pages: 558-567
• Publication date: 2016-06-10
• Acceptance date: 2016-04-14
• DOI: 10.1016/j.physletb.2016.04.029
• EISSN: 1873-2445
• ISSN: 0370-2693
• Keywords: hep-ex