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Indication of an onset of hard-like effects in K+p, π+p and pp collisions at 250 GeV/c

1987; Elsevier BV; Volume: 197; Issue: 3 Linguagem: Inglês

10.1016/0370-2693(87)90420-5

1873-2445

I. Ajinenko, Yu. A. Belokopytov, H. Białkowska, H. Böttcher, P. Chliapnikov, F. Crijns, A. De Roeck, E. A. De Wolf, K. Dziunikowska, A. M. F. Endler, G. V. Gevorkyan, Yu. A. Golubkov, H. Graessler, H. Gulkanyan, P. Hal, J. K. Karamyan, H.H. Kaufmann, W. Kittel, M. Kowalski, E.V. Krutchenko, A. I. Kurnosenko, B. B. Levchenko, F. Meijers, A. B. Michałowska, V. I. Nikolaenko, L. C. S. Oliveira, K. Olkiewicz, E. Riipinen, V. M. Ronjin, A.M. Rybin, H. M. T. Saarikko, Y. T. M. Saarikko, D. Severeijns, W. Schmitz, L. Scholten, O. G. Tchikilev, Л. А. Тихонова, V. Uvarov, F. Verbeure, R. Wischnewski, A. Wróblewski,

Quantum Chromodynamics and Particle Interactions

Similarly as in lepton-hadron scattering, but less pronounced than in e+e− annihilation at comparable energies, we observe a rise of the “sea-gull” wings with CMS energy. The large average transverse momenta around Feynman |xF|=0.4 are mainly due to high multiplicity events, for which also a tail develops in the multiplicity distribution. Neither of these effects can be reproduced by currently used low-pT fragmentation models.