First measurement of the K

K. Piscicchia, S. Wycech, L. Fabbietti, M. Cargnelli, C. Curceanu, R. Del Grande, J. Marton, P. Moskal, A. Scordo, M. Silarski, D. Sirghi, M. Skurzok, I. Tucakovic, O. Vázquez Doce, J. Zmeskal, P. Branchini, E. Czerwinski, V. De Leo, E. De Lucia, A. Di CiccoP. Fermani, S. Fiore, W. Krzemien, G. Mandaglio, M. Martini, E. Perez del Rio, A. Selce

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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.
Original languageEnglish
Pages (from-to)339 - 345
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume782
DOIs
Publication statusPublished - 10 Jul 2018
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

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., ... Selce, A. (2018). First measurement of the K. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 782, 339 - 345. https://doi.org/10.1016/j.physletb.2018.05.025