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
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.