Naslov
First measurement of the K− n →Λ π− non-resonant transition amplitude below threshold

Autori
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, 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.

Izvornik
Physics letters. B (0370-2693) 782 (2018); 339-345

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Strong interaction ; Strangeness nuclear physics ; Antikaon interactions in nuclear matter

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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