High-mass dimuon production in ρ¯n and π-n interactions at 125 GeV/c

Anassontzis, E. ; Malhotra, P. K. ; et., al (1988) High-mass dimuon production in ρ¯n and π-n interactions at 125 GeV/c Physical Review D, 38 (5). pp. 1377-1403. ISSN 0556-2821

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Official URL: http://prd.aps.org/abstract/PRD/v38/i5/p1377_1

Related URL: http://dx.doi.org/10.1103/PhysRevD.38.1377


We have studied muon pairs with an invariant mass between 4 and 9 GeV/c2 produced in ρ-N and π-N interactions at an incident momentum of 125 GeV/c. The experiment was performed at Fermilab using a tungsten target and a special beam enriched to contain 18% antiprotons. We compare differential distributions as functions of the dimuon invariant mass, Feynman x, transverse momentum, and decay angles of the dimuon to the predictions of the Drell-Yan model including QCD corrections. Quark structure functions for the ρ- and π- are extracted. Comparisons of the antiproton data to the Drell-Yan model are significant because the cross sections depend principally on the valence-quark structure functions which are accurately determined by deep-inelastic scattering measurements. The measured absolute cross section (integrated over positive Feynman x and all transverse momenta) is 0.106±0.005±0.008 nb/nucleon for the ρ-N interaction and 0.107±0.003±0.009 nb/nucleon for the ρ-N interaction, where the quoted errors are statistical and systematic, respectively. Normalization (K) factors that are required to bring the naive Drell-Yan and first-order QCD predictions into agreement with the measurements are extracted, and the uncertainties involved in such comparisons are examined.

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