Measurements of Charmless Hadronic b->s Penguin Decays in the pi+pi-K+pi- Final State and First Observation of B0 -> rho0K+pi-

TL;DR

This paper reports the first observation of the B^0 -> rho0 K+pi- decay and measures various charmless hadronic B^0 decays into the pi+pi-K+pi- final state using a large data sample collected at the KEKB collider.

Contribution

It presents the first observation of B^0 -> rho0 K+pi- decay and provides measurements and evidence for several other charmless B^0 decay modes in the pi+pi-K+pi- final state.

Findings

First observation of B^0 -> rho0 K+pi- with 5.0 sigma significance.

Evidence for B^0 -> f0 K+pi- and pi+pi-K*0 decays.

Upper limits set on B^0 -> rho0 K*0 and f0 K*0 branching fractions.

Abstract

We report measurements of charmless hadronic B^0 decays into the pi+pi-K+pi+ final state. The analysis uses a sample of 657x10^6 BBbar pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider at the Y(4S) resonance. The decay B^0 -> rho0 Kpi is observed for the first time; the significance is 5.0sigma and the corresponding partial branching fraction for M_Kpi in (0.75,1.20) GeV/c^2 is [2.8 +- 0.5(stat) +-0.5(syst)] x 10^{-6}. We also obtain the first evidence for B^0 -> f0Kpi with 3.5sigma significance and for B^0 -> pi+pi-K*0 with 4.5sigma significance. For the two-body decays B^0 -> rho0K*0 and B^0 -> f0K*0, the significances are 2.7sigma and 2.5sigma, respectively, and the upper limits on the branching fractions are 3.4x10^{-6} and 2.2x10^{-6} at 90% confidence level.