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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

Åkesson T., Albrow M. G., Almehed S., Batley R., Benary O., Botner O., Bøggild H., Breuker H., Brody H., Burkert V., Carosi R., Carter A. A., Carter J. R., Cecil P., Cleland W. E., Chung S. U., Cockerill D., Dagan S., Dahl-Jensen E., Dahl-Jensen I., Dam P., Damgaard G., Eidelman S., Evans W. M., Fabjan C. W., Frandsen P., Frankel S., Frati W., Gibson M., Goerlach U., Gordon H., Hallgren A., Hansen K. H., Heck B., Hedberg V., Hiddleston J., Hilke H. J., Hooper J., Jarlskog G., Jeffreys P., Jensen T., Kalinovsky A., Kesseler G., Killian T., Kroeger R., Kulka K., Lans J. v d, Lindsay J., Lissauer D., Lörstad B., Ludlam T., Markou A., McCubbin N. A., Mjörnmark U., Molzon W., Møller R., Nielsen B. S., Nilsson A., Olsen L. H., Oren Y., Rosselet L., Rosso E., Rudge A., Schindler R., Stumer I., Sullivan M., Thorstenson G., Vella E., Williamson J., Willis W. J., Winik M., Witzeling W., Woody C., Zajc W. A.

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.