ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 1983, vol. 128, p. 354-360
The dominance of jets at large transverse energy in a full-azimuth hadron calorimeter at ISR energies
Events with a large transverse energy in a calorimeter with full azimuthal coverage and |y| < 0.9 have been investigated in pp collisions at √s = 30, 45, and 63 GeV. A striking change in the event structure, corresponding to a clear emergence of high-pT jets, is observed at √s = 63 and 45 GeV in the region between 25 and 35 GeV in transverse energy. At √s = 30 GeV, the data extend to ET ∼ 20 GeV, but no such change in the event structure is observed. © 1983.