First test of Lepton Flavor Universality in the charmed baryon decays ${\Omega }_c^0\to {\Omega }^{-}{\ell }^{+}{\nu }_{\ell }$ using data of the Belle experiment

Abstract

We present the first observation of the ${\Omega }_c^0\to {\Omega }^{-}{\mu }^{+}{\nu }_{\mu }$ decay and present measurements of the branching fraction ratios of the ${\Omega }_c^0\to {\Omega }^{-}{\ell }^{+}{\nu }_{\ell }$ decays compared to the reference mode ${\Omega }_c^0\to {\Omega }^{-}{\pi }^{+}$, ($\ell =e$ or $\mu$). This analysis is based on 89.5 fb${}^{-1}$, 711 fb${}^{-1}$, and 121.1 fb${}^{-1}$ data samples collected with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider at the center-of-mass energies of 10.52 GeV, 10.58 GeV, and 10.86 GeV, respectively. The ${\Omega }_c^0$ signal yields are extracted by fitting $M_{{\Omega }^{-}{\ell }^{+}}$ and $M_{{\Omega }^{-}{\pi }^{+}}$ spectra. The branching fraction ratios $\mathcal{B}({\Omega }_c^0\to {\Omega }^{-}{e}^{+}{\nu }_e)/\mathcal{B}({\Omega }_c^0\to {\Omega }^{-}{\pi }^{+})$ and $\mathcal{B}({\Omega }_c^0\to {\Omega }^{-}{\mu }^{+}{\nu }_{\mu })/\mathcal{B}({\Omega }_c^0\to {\Omega }^{-}{\pi }^{+})$ are measured to be $1.98\pm 0.13(stat.)\pm 0.08(syst.)$ and $1.94\pm 0.18(stat.)\pm 0.10(syst.)$, respectively. The ratio of $\mathcal{B}({\Omega }_c^0\to {\Omega }^{-}{e}^{+}{\nu }_e)/\mathcal{B}({\Omega }_c^0\to {\Omega }^{-}{\mu }^{+}{\nu }_{\mu })$ is measured to be $1.02\pm 0.10(stat.)\pm 0.02(syst.)$, which is consistent with the expectation of lepton flavor universality.

arXiv comment7 pages, 3 figures, accepted for publication as a Letter in Physical Review D

References in corpus (27)

• High-Energy-Physics Event Generation with PYTHIA 6.1
• Heavy Quark Symmetry
• Evidence for an excess of B -> D(*) Tau Nu decays
• Test of lepton universality with $B^0\to K^{\ast 0}{\ell }^{+}{\ell }^{-}$ decays
• B-physics anomalies: a guide to combined explanations
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2018
• Search for lepton-universality violation in $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• Test of lepton universality in beauty-quark decays
• 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
• Simultaneous Explanation of $R(D^{(\ast )})$ and $b\to s{\mu }^{+}{\mu }^{-}$: The Last Scalar Leptoquarks Standing
• Measurement of the ratio of the $B^0\to D^{\ast -}{\tau }^{+}{\nu }_{\tau }$ and $B^0\to D^{\ast -}{\mu }^{+}{\nu }_{\mu }$ branching fractions using three-prong $\tau$-lepton decays
• Leptoquark model to explain the $B$-physics anomalies, $R_K$ and $R_D$
• Explaining Dark Matter and $B$ Decay Anomalies with an $L_{\mu }-L_{\tau }$ Model
• Leptonic and Semileptonic Decays of Charm and Bottom Hadrons
• Electron Identification in Belle
• Left-handed Z' and Z FCNC quark couplings facing new b -> s mu^+ mu^- data
• TopoAna: A generic tool for the event type analysis of inclusive Monte-Carlo samples in high energy physics experiments
• Measurement of the absolute branching fraction for ${\Lambda }_c^{+}\to \Lambda e^{+}{\nu }_e$
• Measurement of the Absolute Branching Fraction for ${\Lambda }_c^{+}\to \Lambda {\mu }^{+}{\nu }_{\mu }$
• A Phenomenological Analysis of Heavy Hadron Lifetimes
• Measurements of the branching fractions of the semileptonic decays ${\Xi }_c^0\to {\Xi }^{-}{\ell }^{+}{\nu }_{\ell }$ and the asymmetry parameter of ${\Xi }_c^0\to {\Xi }^{-}{\pi }^{+}$
• Charmed ${\Omega }_c$ weak decays into $\Omega$ in the light-front quark model
• Spectator effects in semileptonic decay of charmed baryons
• Semileptonic Decays of Heavy Omega Baryons in a Quark Model
• Measurement of the absolute branching fraction of the inclusive semileptonic ${\Lambda }_c^{+}$ decay
• Observation of the Decay Omega_C^0 --> Omega- e+ nu_e
• Angular Distributions for Multi-body Semileptonic Charmed Baryon Decays

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