Comparison of Dimuon Production by 125 GeV PDF Download

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Book Description
The measurements of dimuon production (M> GeV/c2) by 125 GeV/c anti p and .pi.− performed by Fermilab Experiment 537 are compared to the predictions of the Drell-Yan model in this report. We find that the naive Drell-Yan cross sections calculated using CDHS and NA3 structure functions are too low by factors of 2.25 +- 0.45 and 2.50 +- 0.50 to reproduce the levels of our anti p and .pi.− cross sections respectively. The shapes of the dsigma/dx/sub F/ and M3 dsigma/dM differential cross sections are well reproduced by the naive zeroth order formula. The shape of the dsigma/dp/sub T/ cross section for the dimuons as measured by E-537 can be fit using the Alterelli, Parisi, and Petronzio O(.cap alpha./sub s/) prescription for calculating P/sub T/ distributions but requires k/sub T/2 of the interacting constituents of the nucleons and pion of 0.88 (GeV/c)2. This k/sub T/2 is larger than the k/sub T/2/sub .pi./ = 0.59 +- 0.05 (GeV/c)2 and k/sub T/2/sub P/ = 0.52 +- 0.05 (GeV/c)2 obtained from the linear extrapolations of the s variation of the of the experimentally observed dsigma/dp/sub T/ distributions to s-O. This implies that first order QCD in the formalism of Altarelli, Parisi, and Petronzio is insufficient to explain of the data.