Abstract
We report the first measurement of the absolute branching fraction for $\Lambda^+_{c}\rightarrow \Lambda \mu^+\nu_{\mu}$. This measurement is based on a sample of $e^+e^-$ annihilation data at a center-of-mass energy of $\sqrt{s}=4.6$ GeV collected with the BESIII detector at the BEPCII storage rings. The sample corresponds to an integrated luminosity of 567 pb$^{-1}$. The branching fraction is determined to be $\mathcal B({\Lambda^+_c\rightarrow \Lambda \mu^+\nu_{\mu}})=(3.49\pm0.46({\rm stat})\pm0.27({\rm syst}))\%$. In addition, we calculate the ratio $\mathcal{B}(\Lambda^+_c\rightarrow \Lambda \mu^+\nu_{\mu})/\mathcal{B}(\Lambda^+_c\rightarrow \Lambda e^+\nu_{e})$ to be $0.96\pm0.16({\rm stat})\pm0.04({\rm syst})$.
Highlights
Semileptonic (SL) decays of the lightest charmed baryon,, provide a stringent test for non-perturbative aspects of the strong interaction theory
We report the first absolute measurement of μ+νμ) by analyzing a data sample corresponding to an integrated luminosit√y of 567 pb−1 [15] collected at a center-ofmass (c.m.) energy of s = 4.6 GeV by the BESIII detector at the BEPCII collider
The BESIII [16] detector is a cylindrical detector with a solidangle coverage of 93% of 4π that operates at the BEPCII collider
Summary
Provide a stringent test for non-perturbative aspects of the strong interaction theory. +ν ( denotes lepton) decay is dominated by the Cabibbo-favored transition c → s +ν , which occurs independently of the spin-zero and isospin-zero spectator ud diquark, to good approximation. This leads to a simpler theoretical description and greater predictive power in the non-perturbative models than in the case for charmed mesons [1]. 5 at the Novosibirsk State University, Novosibirsk 630090, Russia. Lepton universality can be tested by comparing the BFs between the electronic and muonic decay modes. C is detected in a number of prolific decay channels This will provide a straightforward and direct BF measurement without requiring knowledge of the total number of. Charge conjugated modes are always implied, unless explicitly mentioned
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