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First measurement of the K− n →Λ π− 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.; Tucaković, Ivana; Vázquez Doce, O.; Zmeskal, J.; Branchini, P.; Czerwinski, E.; De Leo, V.; De Lucia, E.; Di Cicco, A.; Fermani, P.; Fiore, S.; Krzemien, W.; Mandaglio, G.; Martini, M.; Perez del Rio, E.; Selce, A. (2018) First measurement of the K− n →Λ π− non-resonant transition amplitude below threshold. Physics Letters B, 782 . pp. 339-345. ISSN 0370-2693

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We present the analysis of K^− absorption processes on ^4He leading to Λπ^− final states, measured with the KLOE spectrometer at the DAPhiNE 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 KN 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 |A_(K^−n→ Λπ^−)| =(0.334 ± 0.018stat +0.034 −0.058 syst) fm.

Item Type: Article
Uncontrolled Keywords: Strong interaction ; Strangeness nuclear physics ; Antikaon interactions in nuclear matter
Subjects: NATURAL SCIENCES > Physics
Divisions: Division for Marine and Enviromental Research
Depositing User: Sofija Konjević
Date Deposited: 18 Jul 2018 12:39
DOI: 10.1016/j.physletb.2018.05.025

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