The A(K−stop,π±Σ∓)A reaction on p-shell nuclei

Agnello, M.; Benussi, L.; Bertani, M.; Bhang, H. C.; Bonomi, G.; Botta, E.; Bregant, Marco; Bressani, T.; Bufalino, S.; Busso, L.; Calvo, D.; Camerini, Paolo; Dalena, B.; De Mori, F.; D’Erasmo, G.; Fabbri, F. L.; Feliciello, A.; Filippi, A.; Fiore, E. M.; Fontana, A.; Fujioka, H.; Genova, P.; Gianotti, P.; Grion, N.; Lucherini, V.; Marcello, S.; Mirfakhrai, N.; Moia, F.; Montagna, P.; Morra, O.; Nagae, T.; Outa, H.; Pantaleo, A.; Paticchio, V.; Piano, Stefano; Rui, Rinaldo; Simonetti, G.; Wheadon, R.; Zenoni, A.

doi:10.1016/j.physletb.2011.09.076

This Letter is concerned with the study of the K− stop A→π± Σ ∓ A reaction in p-shell nuclei, i.e., 6,7Li, 9Be, 13C and 16O. The π± Σ ∓ /K− stop emission rates are reported as a function of A. These rates are discussed in comparison with previous findings. The ratio π− Σ + /π+ Σ − in p-shell nuclei is found to depart largely from that on hydrogen, which provides support for large in-medium effects possibly generated by the sub-threshold Λ(1405). The continuum momentum spectra of prompt pions and free sigmas are also discussed as well as the π± Σ ∓ missing mass behavior and the link with the reaction mechanism. The apparatus used for the investigation is the FINUDA spectrometer operating at the DANE φ-factory (LNFINFN, Italy).

The A(K−stop,π±Σ∓)A reaction on p-shell nuclei / M., A., L., B., M., B., H. C., B., G., B., E., B., Bregant, M., T., B., S., B., L., B., D., C., Camerini, P., B., D., F., D.M., G., D., F. L., F., A., F., A., F., E. M., F., A., F., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 704:(2011), pp. 474-480. [10.1016/j.physletb.2011.09.076]