| Autor: |
V.V. Abramov, J. Ares, S. Gupta, T. L. Watts, V. Kryshkin, A. Zieminski, S. P. Denisov, Sharon Hagopian, V. Glebov, B. Baldin, A. Salminen, E. Malamud, T. Sulanke, D. McLeod, J. P. Martin, L. Dauwe, C. Halliwell, P.T. Smith, H. Goldberg, T. Marshall, A. Sambamurti, S. Margulies, A.I. Petrukhin, G. B. Yodh, R.M. Heinz, H. Haggerty, G. Wu, J. Krider, R.R. Crittenden, S. Blessing, R.M. Sulyaev, Yu.M. Antipov, J. A. Goodman, M. Nikolic, R. W. Ellsworth, J. Solomon, Rapson Gomez, A. R. Dzierba, Peter W. Draper, R. Abrams, Yu.P. Gorin, C. Stewart, Sergey S.A. Polovnikov |
| Rok vydání: |
1990 |
| Předmět: |
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| Zdroj: |
Physical Review D. 42:1385-1395 |
| ISSN: |
0556-2821 |
| Popis: |
We present results on the production of jets and "jetlike" clusters in 800-GeV/c proton-nucleus (pA ) collisions. Events with high values of transverse energy in the central kinematic region were selected for nuclear targets of H, Be, C, Cu, and Pb. A jet-finding algorithm was used in analyzing the data. The A dependence of the jet and dijet cross sections was parametrized as Aα. The values of α for events with "jetlike" cluster pairs found by the algorithm without any additional kinematic cuts reach a plateau of approximately 1.5 at dijet transverse energies > GeV. The collimation of observed "jetlike" clusters decreases with A, and the fragmentation is softer for heavier target nuclei. However, nuclear effects become less pronounced with the increasing cluster or cluster-pair transverse energy. We argue that the observed nuclear enhancement for the production of "jetlike" clusters is due to underlying event or/and soft-scattering contributions to the heavy-nuclei data. We show that the nuclear enhancement becomes consistent with a value of α within 0.10 from unity once the data are corrected for the underlying event or kinematic cuts enhancing clear jet structure are applied. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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