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arXiv · 1108.1809

Electroproduction of $\Lambda$(1405)

Haiyun Lu·Reinhard Schumacher·Brian Raue·Marianna Gabrielyan
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Abstract

The electroproduction of $K^+ \Lambda$ (1405) was studied by analyzing the E1F data set collected in Hall B at Jefferson Lab. The analysis utilized the decay channel $\Sigma^+ \pi^-$ of the $\Lambda$ (1405) and $p \pi^0$ of the $\Sigma^+$. Simulations of background, $\Lambda$ (1405) and $\Lambda$ (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 $\Lambda$ (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.

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Haiyun Lu, Reinhard Schumacher, Brian Raue, Marianna Gabrielyan. 2011-08-08. Electroproduction of $\Lambda$(1405). https://doi.org/10.1063/1.3701212

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