We study charmless B+ meson decays to the p Lambda pi(+)pi(-) final state using a 605 fb(-1) data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. There are significant signals found with the p Lambda mass peaking near threshold. The observed branching fraction for nonresonant B+-> p Lambda pi(+)pi(-) is (5.92(-0.84)(+0.88)(stat)+/- 0.69(syst))x10(-6) with a significance of 9.1 standard deviations. We also observe the intermediate three-body decay B+-> p Lambda rho(0) with a branching fraction of (4.78(-0.64)(+0.67)(stat)+/- 0.60(syst))x10(-6) and a significance of 9.5 standard deviations, and find a hint of a B+-> p Lambda f(2)(1270) signal. No other intermediate three-body decay is found in this study.
Nicolas Lawrence Etienne Longeard
Julia Schmale, Ivo Fabio Beck, Benjamin Jérémy Laurent Heutte, Nora Bergner, Hélène Paule Angot, Lubna Dada
Julia Schmale, Ivo Fabio Beck, Benjamin Jérémy Laurent Heutte, Lubna Dada