124 research outputs found
New data on OZI rule violation in bar{p}p annihilation at rest
The results of a measurement of the ratio R = Y(phi pi+ pi-) / Y(omega pi+
pi-) for antiproton annihilation at rest in a gaseous and in a liquid hydrogen
target are presented. It was found that the value of this ratio increases with
the decreasing of the dipion mass, which demonstrates the difference in the phi
and omega production mechanisms. An indication on the momentum transfer
dependence of the apparent OZI rule violation for phi production from the 3S1
initial state was found.Comment: 11 pages, 3 PostScript figures, submitted to Physics Letter
The Nuclear Response in Delta-Isobar Region in the (He,t) Reaction
The excitation of a -isobar in a finite nucleus in charge--exchange
(He,t) reaction is discussed in terms of a nuclear response function. The
medium effects modifying a - and a pion propagation were considered for
a finite size nucleus. The Glauber approach has been used for distortion of a
He and a triton in the initial and the final states. The effects
determining the peak positions and its width are discussed. Large displacement
width for the - h excitations and considerable contribution of
coherent pion production were found for the reaction on C.Comment: 29 pages including 8 figures, IU/NTC 92-3
- …