REVIEW
Measurement of the absolute branching fraction for Λ^+_(c)to Λ e^+ν_e
Not yet reviewed by Pith; the record is open.
This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.
SPECIMEN: schema-true, not a live event
T0 review · schema-true
One-sentence machine reading of the paper's core claim.
pith:XXXXXXXX · record.json · timestamp
Measurement of the absolute branching fraction for $\Lambda^+_{c}\to \Lambda e^+\nu_e$
abstract
We report the first absolute measurement of the branching fraction of $\Lambda^+_{c}\rightarrow \Lambda e^+\nu_e$. This measurement is based on 567 pb$^{-1}$ of $e^+e^-$ annihilation data produced at $\sqrt{s}=4.599$ GeV, which is just above the $\Lambda^+_c\bar{\Lambda}^-_c$ threshold. The data were collected with the BESIII detector at the BEPCII storage rings. The branching fraction is determined to be $\mathcal B({\Lambda^+_c\rightarrow \Lambda e^+\nu_e})=(3.63\pm0.38({\rm stat})\pm0.20({\rm syst}))\%$, representing a more than twofold improvement in precision upon previously published results. As the branching fraction for $\Lambda^+_{c}\rightarrow \Lambda e^+\nu_e$ is the benchmark for those of other $\Lambda^+_c$ semileptonic channels, our result provides a unique test of different theoretical models, which is the most stringent to date.
discussion (0)
Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.