Moriond 2012, QCD and High Energy Interactions: Baryonic B decays at BaBar

TL;DR

This paper reports measurements of specific baryonic B decays using BaBar data, providing branching ratios, potential resonant subchannels, and observing unexplained structures in invariant mass distributions.

Contribution

It presents the first measurements of these baryonic B decay modes and suggests possible resonant intermediate states, expanding understanding of baryonic B decay dynamics.

Findings

Branching ratio for B0bar -> LambdaC+ p- p+ p- is less than 6.2 x 10^(-6) at 90% CL.

Branching ratio for B- -> SigmaC++ p- pi- pi- is approximately 3 x 10^(-4).

Evidence for resonant subchannels and unexplained mass structures in decay products.

Abstract

We report on the analyses of the baryonic B decays B0bar -> LambdaC+ p- p+ p- and B- -> SigmaC++ p- pi- pi-. The underlying data sample consists of 470 x 10^6 BBbar pairs generated in the process e+e- -> Y(4S) and collected with the BaBar detector at the PEP-II storage ring at SLAC. We find BR(B0bar -> LambdaC+ p- p+ p-) x BR(LambdaC+ -> p+ K- pi+) / 5% < 6.2 x 10^(-6) @ CL=90% and BR(B- -> SigmaC++ p- pi- pi-) = [2.98 +/- 0.16(stat) +/- 0.15(syst) +/- 0.77(LambdaC+)] x 10^(-4), where the last error is due to the uncertainty in BR(LambdaC+ -> p+ K- pi+). The data suggest the existence of resonant subchannels B- -> LambdaC(2595)+ p- pi- and, possibly, B- -> SigmaC++ anti-Delta-- pi-. We see unexplained structures in m(SigmaC++ pi- pi-) at 3.25 GeV/c^2, 3.8 GeV/c^2, and 4.2 GeV/c^2.