We present the analysis of K−absorption processes on He4 leading to Λπ−final states, measured with the KLOE spectrometer at the DAΦNE e+e−collider and extract, for the first time, the modulus of the non-resonant K−n →Λπ−direct production amplitude about 33 MeV below the K‾N threshold. This analysis also allows to disentangle the K−nuclear absorption at-rest from the in-flight capture, for K−momenta of about 120 MeV. The data are interpreted with the help of a phenomenological model, and the modulus of the non-resonant K−n →Λπ−amplitude for K−absorption at-rest is found to be |AK−n→Λπ−|=(0.334±0.018stat−0.058+0.034syst)fm.
First measurement of the K−n →Λπ−non-resonant transition amplitude below threshold / Piscicchia, K., Wycech, S., Fabbietti, L., Cargnelli, M., Curceanu, C., Del Grande, R., Marton, J., Moskal, P., Scordo, A., Silarski, M., Sirghi, D., Skurzok, M., Tucakovic, I., Vázquez Doce, O., Zmeskal, J., Branchini, P., Czerwinski, E., De Leo, V., De Lucia, E., Di Cicco, A., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 782:(2018), pp. 339-345. [10.1016/j.physletb.2018.05.025]
First measurement of the K−n →Λπ−non-resonant transition amplitude below threshold
Fermani, P.;Perez del Rio, E.;
2018
Abstract
We present the analysis of K−absorption processes on He4 leading to Λπ−final states, measured with the KLOE spectrometer at the DAΦNE e+e−collider and extract, for the first time, the modulus of the non-resonant K−n →Λπ−direct production amplitude about 33 MeV below the K‾N threshold. This analysis also allows to disentangle the K−nuclear absorption at-rest from the in-flight capture, for K−momenta of about 120 MeV. The data are interpreted with the help of a phenomenological model, and the modulus of the non-resonant K−n →Λπ−amplitude for K−absorption at-rest is found to be |AK−n→Λπ−|=(0.334±0.018stat−0.058+0.034syst)fm.| File | Dimensione | Formato | |
|---|---|---|---|
|
Piscicchia_First-measurement_2018.pdf
accesso aperto
Tipologia:
Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza:
Creative commons
Dimensione
1.09 MB
Formato
Adobe PDF
|
1.09 MB | Adobe PDF |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
