Contribution from [formula omitted] and [formula omitted] waves in [formula omitted] annihilation at rest

• Published in: Nuclear physics. A 2001-04, Vol.686 (1), p.317-340
• Main Authors: Bendiscioli, G., Filippini, V., Fontana, A., Montagna, P., Rotondi, A., Salvini, P., Bertin, A., Bruschi, M., Capponi, M., De Castro, S., Dona', R., Galli, D., Giacobbe, B., Marconi, U., Massa, I., Piccinini, M., Semprini Cesari, N., Spighi, R., Vecchi, S., Vagnoni, V., Villa, M., Vitale, A., Zoccoli, A., Bianconi, A., Bonomi, G., Lodi Rizzini, E., Venturelli, L., Zenoni, A., Cicalò, C., De Falco, A., Masoni, A., Puddu, G., Serci, S., Usai, G., Gorchakov, O.E., Prakhov, S.N., Rozhdestvensky, A.M., Tretyak, V.I., Poli, M., Gianotti, P., Guaraldo, C., Lanaro, A., Lucherini, V., Petrascu, C., Kudryavtsev, A.E., Balestra, F., Bussa, M.P., Busso, L., Cerello, P., Denisov, O.Yu, Ferrero, L., Grasso, A., Maggiora, A., Panzarasa, A., Panzieri, D., Tosello, F., Botta, E., Bressani, T., Calvo, D., Costa, S., D'Isep, D., Feliciello, A., Filippi, A., Marcello, S., Mirfakhrai, N., Agnello, M., Iazzi, F., Minetti, B., Tessaro, S.
• Format: Article
• Language: English
• Subjects: [formula omitted] annihilation; Annihilation fractions from [formula omitted] and [formula omitted] atomic levels; Exotic atoms
• ISSN: 0375-9474
• DOI: 10.1016/S0375-9474(00)00517-0

The annihilation frequencies of 19 p ̄ p annihilation reactions at rest obtained in different target densities are analysed in order to determine the values of the P-wave annihilation percentage at each target density and the average hadronic branching ratios from P- and S-states. Both the assumptions of linear dependence of the annihilation frequencies on the P-wave annihilation percentage of the protonium state and the approach with the enhancement factors of Batty are considered. Furthermore the cases of incompatible measurements are discussed.