Paper detail

Electroproduction of $Λ$(1405)

The electroproduction of $K^+ Λ$ (1405) was studied by analyzing the E1F data set collected in Hall B at Jefferson Lab. The analysis utilized the decay channel $Σ^+ π^-$ of the $Λ$ (1405) and $p π^0$ of the $Σ^+$. Simulations of background, $Λ$ (1405) and $Λ$ (1520) production according to PDG values were performed by using standard CLAS analysis tools adapted for the E1F run. Fits of the acceptance-corrected simulations were made to the acceptance-corrected data to determine contributions from signal and background processes. The line shape of $Λ$ (1405) varies with the four momentum transfer, $Q^2$, and does not match the line shape based on PDG resonance parameters. It corresponds approximately to predictions of a recent two-pole meson-baryon picture of this state.