Measurement of the branching fraction B(Λb0→Λc+π-π+π-) at CDF

Abstract

We report an analysis of the Λb0→Λc+π-π+π- decay in a data sample collected by the CDF II detector at the Fermilab Tevatron corresponding to 2.4 fb-1 of integrated luminosity. We reconstruct the currently largest samples of the decay modes Λb0→Λc(2595)+π- (with Λc(2595)+→Λc+π+π-), Λb0→Λc(2625)+π- (with Λc(2625)+→Λc+π+π-), Λb0→Σc(2455)++π-π- (with Σc(2455)++→Λc+π+), and Λb0→Σc(2455)0π+π- (with Σc(2455)0→Λc+π-) and measure the branching fractions relative to the Λb0→Λc+π- branching fraction. We measure the ratio B(Λb0→Λc+π-π+π-)/ B(Λb0→Λc+π-)=3.04±0.33(stat)-0.55+0.70(syst) which is used to derive B(Λb0→Λc+π-π+π-)=(26.8-11.2+11.9)×10-3.