Measurement of the Ξ_c⁺ Lifetime Using Belle II Simulations

We present a measurement of the lifetime of the Ξ_c⁺, a rapidly decaying charmed baryon, using Belle II simulation. Studies are underway using five different decay modes (Ξ_c⁺ —> Ξ^- π⁺

π⁺ , Ξ_c⁺ —> p⁺ K^- π⁺, Ξ_c⁺ —> ∑⁺ K^- π⁺ , Ξ_c⁺ —> ∑⁺ π^- π⁺, Ξ_c⁺ —> Ξ⁰ π⁺ π⁺ π^-) with 500 fb^-1 of Monte Carlo, comparable to the size of the data collected by the Belle II experiment, with the goal of combining all modes for a combined fit to determine the Ξ_c⁺ lifetime. With a single, all charged, final state, the lifetime extracted from simulation (464 ± 15 fs) is consistent with the simulated lifetime within 1.5σ. With the addition of more decay modes, the uncertainty will be reduced and potentially become competitive with other experiments.

Paul Gebeline 3:13 PM