Study of Lambda/c+ Cabibbo Favored Decays Containing a Lambda Baryon in the Final State

TL;DR

This paper reports precise measurements of branching fractions and decay ratios of Lambda_c+ baryons into various final states involving Lambda hyperons, using data from the FOCUS experiment, and analyzes the subresonant structure of one decay mode.

Contribution

The study provides new experimental measurements of decay rates and subresonant structures for Lambda_c+ baryon decays, enhancing understanding of charm baryon decay mechanisms.

Findings

Measured branching fractions of Lambda_c+ decays relative to pK-π+.

Reported new decay ratio measurements involving Sigma0 and Xi(1690)^0.

Analyzed subresonant structure of Lambda_c+ → Lambda π+ π+ π- decay.

Abstract

Using data from the FOCUS experiment (FNAL-E831), we study the decay of $\Lambda^+_c$ baryons into final states containing a $\Lambda$ hyperon. The branching fractions of $\Lambda^+_c$ into $\Lambda \pi^+$, $\Lambda \pi^+ \pi^+ \pi^-$ and $\Lambda \bar{K} ^0 K^+$ relative to that into $pK^-\pi^+$ are measured to be $0.217 \pm 0.013 \pm 0.020$, $0.508 \pm 0.024 \pm 0.024$ and $0.142 \pm 0.018 \pm 0.022$, respectively. We also report new measurements of $\frac{\Gamma(\Lambda^+_c \to \Sigma^0 \pi^+)}{\Gamma(\Lambda^+_c \to \Lambda \pi^+)} = 1.09 \pm 0.11 \pm 0.19$, $\frac{\Gamma(\Lambda^+_c \to \Sigma^0 \pi^+\pi^+ \pi^-)}{\Gamma(\Lambda^+_c \to \Lambda \pi^+ \pi^+ \pi^-)} = 0.26 \pm 0.06 \pm 0.09$ and $\frac{\Gamma(\Lambda^+_c \to \Xi(1690)^0(\Lambda \bar{K} ^0) K^+)}{\Gamma(\Lambda^+_c \to \Lambda \bar{K} ^0 K^+)} = 0.33 \pm 0.10 \pm 0.04$. Further, an analysis of the subresonant structure for the $\Lambda^+_c \to \Lambda \pi^+\pi^+\pi^-$ decay mode is presented.