First observation of the production and decay of the Σc+
1980; Elsevier BV; Volume: 93; Issue: 4 Linguagem: Inglês
10.1016/0370-2693(80)90379-2
ISSN1873-2445
AutoresM. Calicchio, O. Erriquez, M.T. Fogli-Muciaccia, S. Natali, S. Nuzzo, F. Romanò, F. Ruggieri, R. Belusević, D.C. Colley, G. T. Jones, S.W. OʼNeale, S. J. Sewell, M.F. Votruba, Daniel Bertrand, P. Marage, J. Moreels, J. Sacton, C. Vander Velde-Wilquet, W. Van Doninck, G. Wilquet, H. Leutz, H. Wenninger, V. Brisson, T. François, P. Petiau, H. H. Bingham, A.M. Cooper, J. Guy, A. G. Michette, M. Tyndel, W. Vénus, J. Alitti, J.P. Baton, G. Gerbier, M. Iori, C. Kochowski, M. Neveu, T. Azemoon, N. J. Baker, J.H. Bartley, F.W. Bullock,
Tópico(s)High-Energy Particle Collisions Research
ResumoAn event with the decay chain Σc+ → Λc+ + π0, Λc+ → K− + p + π+, has been observed in an exposure of BEBC, equipped with a track sensitive target, to the wide band neutrino beam from the SPS at CERN. The event has a unique three constraint kinematic fit to the ΔS = −ΔQ reaction v + p → μ− + p + K− + π+ + π+ + π0 with both gammas from the π0 decay detected. The proton and other final state particles are identified. The masses are M(Λc+) = 2290 ± 3 MeV/c2, M(Σc+) = 2457 ± 4 MeV/c2 and M(Σc+) − M(Λc+) = 168 ± 3 MeV/c2. Including other data one obtains M (Σc++) − M(Σc+) = 0 ± 4 MeV/c2.
Referência(s)