Properties of the Lambda(1520) Resonance from High-Precision Electroproduction Data

Abstract

High-resolution spectrometer measurements of the reaction H(e,e'K+)X at small Q2 are used to extract the mass and width of the Lambda(1520). We investigate the influence of various assumptions used in the extraction. The width appears to be more sensitive to the assumptions than the mass. To reach a width uncertainty about 1 MeV or better, one needs to know the structure of the non-resonant background. Based on the new Jefferson Lab Hall A data, our final values for the Breit-Wigner parameters are M = 1520.4 +- 0.6 (stat) +- 1.5 (syst) MeV, Gamma = 18.6 +- 1.9 (stat) +- 1 (syst) MeV. For the first time, we also estimate the pole position for this resonance and find that both the pole mass and width seem to be smaller than the Breit-Wigner values.

7 pages, 3 figures; corresponds to the published version

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• Observation of narrow baryon resonance decaying into $p{K}_s^0$ in pA-interactions at $70GeV/c$ with SVD-2 setup
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• Strange Hadron Spectroscopy with Secondary KL Beam in Hall D
• Differential cross sections for Λ(1520) using photoproduction at CLAS
• Amplitude analysis of $\bar{K}N$ scattering
• Physics Opportunities with a Secondary K0_L Beam at JLab
• Physics Opportunities with Meson Beams for EIC
• K-Long Facility for JLab and its Scientific Potential