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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 1985, vol. 152, p. 411-418

Production of prompt positrons at low transverse momentum in 63 GeV pp collisions at the CERN intersecting storage rings

Åkesson T., Albrow M. G., Almehed S., Anassontzis E., Batley R., Benary O., Bøggild H., Botner O., Breuker H., Brody H., Burkert V., Callen B., Carosi R., Carter A. A., Carter J. R., Cecil P. C., Chernyatin V., Choi Y., Cleland W. E., Dagan S., Dahl-Jensen E., Dahl-Jensen I., Dam P., Damgaard G., Dolgoshein B., Eidelman S., Evans W. M., Fabjan C. W., Frandsen P., Frankel S., Frati W., Gavrilenko I., Gibson M. D., Goerlach U., Goloubkov Y., Gordon H., Hansen K. H., Hedberg V., Hiddleston J. W., Hooper J. E., Ioannou P., Jarlskog G., Jeffreys P., Jensen T., Kalinovsky A., Kantserov V., Katsanevas S., Kesseler G., Killian T., Kourkoumelis C., Kroeger R., Kulka K., Lans J. v d, Lindsay J., Lissauer D., Lörstad B., Ludlam T., Mannelli I., Markou A., Mayburov S., McCubbin N. A., Mjörnmark U., Møller R., Molzon W., Nevsky P., Nielsen B. S., Olsen L. H., Oren Y., Palmer R. B., Piskounov G., Rahm D. C., Resvanis L. K., Rosso E., Rudge A., Schukraft J., Shmeleva A., Sidorov V., Specht H., Stumer I., Sullivan M., Thompson J. A., Thorstenson G., Vasiliev P., Vella E., Williamson J., Willis W. J., Winik M., Witzeling W., Woody C., Zajc W. A.

The production of inclusive prompt positrons in pp collisions at √s = 63 GeV and θcm = 90° has been measured over the pT interval 0.08 <pT < 1.0 GeV c. The e/π ratio rises from ∼ 2 × 10-4 at pT = 0.9 GeV c to ∼ 1 × 10-3 at pT = 0.1 GeV c. This is a factor of 6 higher than would be expected from the sum of hadronic bremsstrahlung and the semileptonic decay of charm. © 1985.