Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-03-29
Phys.Lett.B694:123-128,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 3 figures; corresponds to the published version
Scientific paper
10.1016/j.physletb.2010.09.052
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.
Azimov Ya. I.
Briscoe William J.
Gao Hui
Higinbotham Douglas W.
Nelyubin V. V.
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