Observation of a rare annihilation channel due to antiprotons stopping in nuclear photoemulsion

摘要

An analysis of 3799 annihilation events due to antiprotons stopping in nuclear photoemulsion has permitted identification of six one-prong stars with an average range of the secondary slow 'b'-particles equal to (79.5(+-)5.1) (mu)m. The small spread of the ranges points to antiproton annihilation on a nucleon cluster in the surface layer of a nucleus proceeding through a binary channel. Kinematical analysis reveals that this channel may involve the production of a (Phi)(sub 3)(sup 0) (1850)- meson in antiproton annihilation on a heavy nucleus in the photoemulsion. The branching ratio for production of the detected events is, at least, (3.2(+-)0.9)(center dot)10(sup -3). 5 refs., 1 fig. (Atomindex citation 28:015732)