Observation of the Decay $D^0\to {\rho }^{-}{\mu }^{+}{\nu }_{\mu }$

Abstract

By analyzing an $e^{+}{e}^{-}$ annihilation data sample corresponding to an integrated luminosity of $2.93{\mathrm{fb}}^{-1}$ collected at a center-of-mass energy of 3.773 GeV with the BESIII detector, we measure the branching fraction of the $D^0\to {\rho }^{-}{\mu }^{+}{\nu }_{\mu }$ decay for the first time. We obtain ${\mathcal{B}}_{D^0\to {\rho }^{-}{\mu }^{+}{\nu }_{\mu }}=(1.35\pm 0.09_{\mathrm{stat}}\pm 0.09_{\mathrm{syst}})\times 10^{-3}$. Using the world average of ${\mathcal{B}}_{D^0\to {\rho }^{-}{e}^{+}{\nu }_e}$, we find a branching fraction ratio of ${\mathcal{B}}_{D^0\to {\rho }^{-}{\mu }^{+}{\nu }_{\mu }}/{\mathcal{B}}_{D^0\to {\rho }^{-}{e}^{+}{\nu }_e}=0.90\pm 0.11$, which agrees with the theoretical expectation of lepton flavor universality within the uncertainty. Combining the world average of ${\mathcal{B}}_{D^{+}\to {\rho }^0{\mu }^{+}{\nu }_{\mu }}$ and the lifetimes of $D^{0(+)}$, we obtain a partial decay width ratio of ${\Gamma }_{D^0\to {\rho }^{-}{\mu }^{+}{\nu }_{\mu }}/(2{\Gamma }_{D^{+}\to {\rho }^0{\mu }^{+}{\nu }_{\mu }})=0.71\pm 0.14$, which is consistent with the isospin symmetry expectation of one within $2.1\sigma$. For the reported values of ${\mathcal{B}}_{D^0\to {\rho }^{-}{\mu }^{+}{\nu }_{\mu }}/{\mathcal{B}}_{D^0\to {\rho }^{-}{e}^{+}{\nu }_e}$ and ${\Gamma }_{D^0\to {\rho }^{-}{\mu }^{+}{\nu }_{\mu }}/2{\Gamma }_{D^{+}\to {\rho }^0{\mu }^{+}{\nu }_{\mu }}$, the uncertainty is the quadratic sum of the statistical and systematic uncertainties.

9 pages, 3 figures

References in corpus (12)

• On the B to D* tau nu Sensitivity to New Physics
• Explaining $h\to {\mu }^{\pm }{\tau }^{\mp }$, $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$ and $B\to K{\mu }^{+}{\mu }^{-}/B\to K{e}^{+}{e}^{-}$ in a two-Higgs-doublet model with gauged $L_{\mu }-L_{\tau }$
• Measurement of the branching ratio of ${\bar{B}}^0\to D^{\ast +}{\tau }^{-}{\bar{\nu }}_{\tau }$ relative to ${\bar{B}}^0\to D^{\ast +}{\ell }^{-}{\bar{\nu }}_{\ell }$ decays with a semileptonic tagging method
• Implications of lepton flavor universality violations in B decays
• $B_{(s)},D_{(s)}\to \pi ,K,\eta ,\rho ,K^{\ast },\omega ,\varphi$ Transition Form Factors and Decay Rates with Extraction of the CKM parameters $|V_{ub}|$, $|V_{cs}|$, $|V_{cd}|$
• Branching fractions of semileptonic $D$ and $D_s$ decays from the covariant light-front quark model
• Semileptonic decays of $D$ and $D_s$ mesons in the relativistic quark model
• Discerning new physics in charm meson leptonic and semileptonic decays
• Measurement of the $D\to K^{-}{\pi }^{+}$ strong phase difference in $\psi (3770)\to D^0\overline{D}{}^0$
• Analysis of the D+ --> K- pi+ e+ nu_e decay channel
• Observation of the Doubly Cabibbo-Suppressed Decay $D^{+}\to K^{+}{\pi }^{+}{\pi }^{-}{\pi }^0$ and Evidence for $D^{+}\to K^{+}\omega$
• Measurements of the absolute branching fractions of $D^{0(+)}\to K\bar{K}\pi \pi$ decays

Cited by in corpus (3)

• Hints of Natural Supersymmetry in Flavor Anomalies?
• Probing $|V_{cs}|$ and lepton flavor universality through $D\to K_0^{\ast }(1430)\ell {\nu }_{\ell }$ decay
• Exclusive semileptonic decays of $D$ and $D_s$ mesons into orbitally and radially excited states of strange and light mesons