We study the hadronic decays of Λc+ to the final states
Σ+η and Σ+η′, using an e+e− annihilation
data sample of 567 pb−1 taken at a center-of-mass energy of 4.6 GeV with
the BESIII detector at the BEPCII collider. We find evidence for the decays
Λc+→Σ+η and Σ+η′ with
statistical significance of 2.5σ and 3.2σ, respectively.
Normalizing to the reference decays Λc+→Σ+π0 and
Σ+ω, we obtain the ratios of the branching fractions
B(Λc+→Σ+π0)B(Λc+→Σ+η) and B(Λc+→Σ+ω)B(Λc+→Σ+η′) to be 0.35±0.16±0.03 and 0.86±0.34±0.07, respectively. The upper limits at the 90\% confidence level are
set to be B(Λc+→Σ+π0)B(Λc+→Σ+η)<0.58 and B(Λc+→Σ+ω)B(Λc+→Σ+η′)<1.2. Using BESIII measurements of the
branching fractions of the reference decays, we determine B(Λc+→Σ+η)=(0.41±0.19±0.05)%
(<0.68%) and B(Λc+→Σ+η′)=(1.34±0.53±0.21)%
(<1.9%). Here, the first uncertainties are statistical and the second
systematic. The obtained branching fraction of Λc+→Σ+η is
consistent with the previous measurement, and the branching fraction of
Λc+→Σ+η′ is measured for the first
time.Comment: Accepted by Chin. Phys. C : Chin. Phys. C 43, 083002, (2019