We present the analysis of K−absorption processes on 4He leading to Lambdaπ−final states, measured with the KLOE spectrometer at the DAFNE e+e−collider and extract, for the first time, the modulus of the non-resonant K−n →Lambdaπ−direct production amplitude about 33MeV below the KN threshold. This analysis also allows to disentangle the K−nuclear absorption at-rest from the in-flight capture, for K−momenta of about 120MeV. The data are interpreted with the help of a phenomenological model, and the modulus of the non-resonant K−n→Lambdaπ−amplitude for K−absorption at-rest is found to be |AK−n→Lambdaπ−| =(0.334 ±0.018 stat+0.034−0.058syst) fm.
First measurement of the K−n →Λπ−non-resonant transition amplitude below threshold
Mandaglio, G.Investigation
;
2018-01-01
Abstract
We present the analysis of K−absorption processes on 4He leading to Lambdaπ−final states, measured with the KLOE spectrometer at the DAFNE e+e−collider and extract, for the first time, the modulus of the non-resonant K−n →Lambdaπ−direct production amplitude about 33MeV below the KN threshold. This analysis also allows to disentangle the K−nuclear absorption at-rest from the in-flight capture, for K−momenta of about 120MeV. The data are interpreted with the help of a phenomenological model, and the modulus of the non-resonant K−n→Lambdaπ−amplitude for K−absorption at-rest is found to be |AK−n→Lambdaπ−| =(0.334 ±0.018 stat+0.034−0.058syst) fm.Pubblicazioni consigliate
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