Abstract
Based on 586 pb−1 of e+e− annihilation data collected at a center-of-mass energy of s=4.6GeV with the BESIII detector at the BEPCII collider, the absolute branching fraction of Λc+→pKS0η decays is measured for the first time to be B(Λc+→pKS0η)=(0.414±0.084±0.028)%, where the first uncertainty is statistical and the second is systematic. The result is compatible with a previous CLEO result on the relative branching fraction B(Λc+→pKS0η)B(Λc+→pK−π+), and consistent with theoretical predictions of SU(3) flavor symmetry.
Highlights
The lightest charmed baryon, Λ+c, was first observed in the 1970s [1, 2], but only in the past few years has there been significant progress in precision measurements of its absolute decay rates [3, 4]
SIII detector consists of a helium-based multilayer drift chamber (MDC), a plastic scintillator time-of-flight system (TOF), and a CsI(Tl) electromagnetic calorimeter (EMC), which are all enclosed in a superconducting solenoidal magnet providing a 1.0 T magnetic field
The distance of closest approach to the interaction point (IP) must be within ±20 cm along the MDC axis
Summary
The lightest charmed baryon, Λ+c , was first observed in the 1970s [1, 2], but only in the past few years has there been significant progress in precision measurements of its absolute decay rates [3, 4]. Driven by these improvements, the theoretical calculations of charmed baryon decays have greatly improved their treatment of non-perturbative effects [5,6,7,8]. ΛΛ −c+c pairs in the same data sample, which gives a chance to meansure the absolute BF of the other Λ+c decay channels In this analysis, we use the single tag (ST) method in which the Λ −c is not
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