Experimental results on multi-nucleonic K− absorptions in light nuclei
1 Excellence Cluster ’Origin and Structure of the Universe’, 85748 Garching, (Germany)
2 Physik Department E12, Technische Universität München, 85748 Garching, (Germany)
3 INFN Laboratori Nazionali di Frascati, Frascati, Italy
4 Stefan-Meyer-Institut für Subatomare Physik, Wien, Austria
5 Excellence Cluster Universe, Technische Universität München, Garching, Germany
6 Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”, Roma, Italy
7 Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH), Magurele, Romania.
8 Ruder Boskovic Institute, Zagreb, Croatia
9 National Centre for Nuclear Research, Warsaw, Poland
10 Dipartimento M.I.F.T. dell’Università di Messina, Messina, Italy
11 Novosibirsk State University, Novosibirsk, Russia
12 INFN Sezione Catania, Catania, Italy
13 Institute of Physics, Jagiellonian University, Cracow, Poland
14 INFN Gruppo collegato di Messina, Messina, Italy
15 Dipartimento di Scienze e Tecnologie applicate, Università “Guglielmo Marconi”, Roma, Italy
16 Dipartimento di Scienze di Base e Applicate per l’Ingegneria, Sapienza Università di Roma, Roma, Italy
17 INFN Sezione di Roma, Roma, Italy
18 Dipartimento di Fisica, Università degli Studi di Roma Tor Vergata, Roma, Italy
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Published online: 22 March 2017
The AMADEUS collaboration studied the K− absorptions at low momentum in light nuclei leading to Σ0p final state. Those events were recorded by the KLOE detector, used as an active target, installed in the the DAΦNE collider. The results show that it is possible to isolate the process where the K− is absorbed by two nucleons and the decay products are emitted without any further final state interactions among other contributions involving more than two nucleons. Further, the possible contribution of a ppK− bound state was investigated. The best fit gives space to a yield of ppK−/Kstop− = (0.044 ± 0.009 stat−0.005+0.004) × 10−2 corresponding to a binding energy and a width of 45 and 30 MeV/c2, respectively. A statistical analysis of this result shows although that its significance is only at the level of 1σ.
© The Authors, published by EDP Sciences, 2017
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