Study of $\Lambda_c^+\rightarrow \Lambda \mu^+\nu_{\mu}$ and Test of Lepton Flavor Universality with $\Lambda_c^+\rightarrow \Lambda \ell^+\nu_{\ell}$ Decays

The measurement of the Cabibbo-favored semileptonic decay $\Lambda_c^+\rightarrow \Lambda \mu^+\nu_{\mu}$ is reported using $4.5~\mathrm{fb}^{-1}$ of $e^+e^-$ annihilation data collected at center-of-mass energies ranging from 4.600~GeV to 4.699~GeV. The branching fraction of the decay is measured to be $\mathcal{B}(\Lambda_c^+\rightarrow \Lambda \mu^+\nu_{\mu})=(3.48\pm0.14_{\rm stat.}\pm0.10_{\rm syst.})\%$, three times more precise than the prior world average result. Tests of lepton flavor universality using $\Lambda_c^+\rightarrow \Lambda \ell^+\nu_{\ell}$ ($\ell=e, \mu$) decays are reported for the first time, based on measurements of the differential decay rates and the forward-backward asymmetries in separate four-momentum transfer regions. The results are compatible with Standard Model predictions. Furthermore, we improve the determination of the form-factor parameters in $\Lambda_c^+\rightarrow \Lambda \ell^+\nu_{\ell}$ decays, which provide stringent tests and calibration for lattice quantum chromodynamics (LQCD) calculations.

• Publication year

  2023

• Venue

  Unknown venue

• Publication date

  2023-06-05

• Fields of study

  Physics

• Identifiers
  arXiv 2306.02624
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

• Erratum: Heavy-to-light semileptonic decays of Λ b and Λ c baryons in the covariant confined quark model [Phys. Rev. D 90 , 114033 (2014)]

  2016cited by this paper
• Observation of CP violation in B ± → D K ± decays ✩

  2012cited by this paper
• BaBar Collaboration

  2009cited by this paper
• Cleo Collaboration

  2008cited by this paper
• Typeset Using Revt E X

  1992cited by this paper

• No citing papers are available for this paper.