Bernard R French

Study of YY production in two, three and four body final states by 3.0, 3.6 and 4.0 GeV/c antiprotons in hydrogen

SummaryWe present the results on hyperon-antihyperon production by 3.0, 3.6 and 4.0 GeV/c antiprotons in hydrogen. We used about 300 000 pictures taken in an antiproton beam from the CERN proton synchrotron with the 81 cm Saclay hydrogen bubble chamber. A systematic study was made of interactions leading to a hyperon and an antihyperon with or without additional pions in the final states. The analysis indicates that the cross-sections for each of these processes are of the order of few tens of microbarns or less and that, whereas for the two-body final states the cross-sections decrease when the

Annihilations of 3.0 and 3.6 GeV/c antiprotons into six or more pions

\bar p

A long scintillation counter for precise measurement of time of flight and impact position

momentum increases from 3.0 to 4.0 GeV/c, the cross-sections for 3 and 4 body final states remain constant. For most of these events the angular distributions show a strong forward peaking of the antihyperon in the c.m.s. of the interaction. This suggests that a peripheral-type mechanism is predominant in these processes. About half of the events of the type

The slow proton trigger for the CERN OMEGA spectrometer

\bar pp \to Y\bar Y\pi

Strange-particle production in\(\bar pp\) collisions at 5.7 GeV/ccollisions at 5.7 GeV/c

or