A new measurement of the Ξc+ lifetime

Abstract A precise determination of the charm-strange baryon Ξ c + lifetime is presented. The data were accumulated by the Fermilab high-energy photoproduction experiment FOCUS. The measurement is made with 300 Ξ c + → Ξ − π + π + decays, 130 Ξ c + → Σ + K − π + decays, 45 Ξ c + → pK − π + decays and 58 Ξ c + → Λ 0 K − π + π + decays. The Ξ c + lifetime is measured to be 0.439 ± 0.022 ± 0.009 ps.