A search for triple jets produced in proton-proton collisions at s=62 GeV has been performed at the CERN ISR. For 42 000 events obtained with an average trigger π0 transverse momentum of 6 GeV/c, 782 triple-jet events are identified using a clustering method. The two jets opposite the trigger show a correlation in their polar angle distributions. The triple-jet production rate is much higher than expected by scaling the rate from e+e- processes.
Bibliographical noteFunding Information:
9 Permanent address: Physics Department, University of Washington, Seattle, WA, USA. lo Research supported in part by the National Science Founda-tion. 11 Research supported in part by the US Department of Energy. * 1 Darriulat \[1 \] gives a list of experiments and references.