Differential cross sections ofJ/ψandψ′in 800 GeV/c p-Si interactions

Autor: Stanislav Tokár, Germano Bonomi, L. Turnbull, J. Lys, J. G. Sun, Michael Wayne Arenton, M. Jenkins, H. H. Bingham, P. Torre, D. E. Wagoner, Gianluca Introzzi, R. P. Smith, M. Haire, L.R. Fortney, M. Panareo, A. McManus, W. Selove, Wannian Yang, W. Kowald, H. C. Ballagh, T. Alexopoulos, Kwong Lau, C. T. Murphy, D. Judd, K. Clark, B. T. Zou, S. Conetti, V. Pogosian, S. Ramachandran, G. Corti, P. Hanlet, V. Golovatyuk, G. H. Mo, W. Kononenko, K. S. Nelson, M. Cooper, Bradley Cox, David B. Cline, P.O. Mazur, E. Gorini, C. Durandet, A. Blankman, M. He, Catherine A. Dukes, Alexander Ledovskoy, C. Wei, J. Trischuk, Z. L. Cao, P. Creti, L. Antoniazzi, A. Boden, Martin M. Block, N. J. Zhang, V. Elia, F. Grancagnolo, J. Rhoades, A. R. Erwin, T.Y. Chen, K. Hagan-Ingram, Leonard Spiegel, N. Yao, G. Liguori, S. Misawa, C. R. Wang
Rok vydání: 1997
Předmět:
Zdroj: Physical Review D. 55:3927-3932
ISSN: 1089-4918
0556-2821
DOI: 10.1103/physrevd.55.3927
Popis: We present the x{sub F} and p{sub T} differential cross sections of J/{psi} and {psi}{sup {prime}}, respectively, in the ranges {minus}0.05{lt}x{sub F}{lt}0.25 and p{sub T}{lt}3.5 GeV/c. The data samples are constituted by about 12000 J/{psi} and 200 {psi}{sup {prime}} produced in proton-silicon interactions at 800 GeV/c and decaying into opposite sign muons. The x{sub F} and p{sub T} distributions are compared with recent results from experiments E789 at the same energy and to leading order QCD predictions using the MRS D0 parametrization for the parton structure function. The measured shapes of the differential cross sections, except for the d{sigma}/dx{sub F} at small x{sub F}, agree very well with the prediction, even though their value is quite a bit larger than the prediction. We also present the cos{theta} differential cross section of the J/{psi} which indicates unpolarized production in contrast with color octet models predictions. {copyright} {ital 1997} {ital The American Physical Society}
Databáze: OpenAIRE
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