Measurement of the absolute branching fraction for Λc +→Λμ+νμ


Ablikim M., Achasov M., Ahmed S., Ai X., Albayrak O., Albrecht M., ...More

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol.767, pp.42-47, 2017 (SCI-Expanded) identifier identifier

Abstract

We report the first measurement of the absolute branching fraction for Λc +→Λμ+νμ. This measurement is based on a sample of e+e− annihilation data produced at a center-of-mass energy 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 B(Λc +→Λμ+νμ)=(3.49±0.46(stat)±0.27(syst))%. In addition, we calculate the ratio B(Λc +→Λμ+νμ)/B(Λc +→Λe+νe) to be 0.96±0.16(stat)±0.04(syst).