For some years there has been uncertainty over whether regularisation by dimensional reduction (DRED) is viable for non-supersymmetric theories. We resolve this issue by showing that DRED is entirely equivalent to standard dimensional regularisation (DREG), to all orders in perturbation theory and for a general renormalisable theory. The two regularisation schemes are related by an analytic redefinition of the couplings, under which the β-functions calculated using DRED transform into those computed in DREG. The Smatrix calculated using DRED is numerically equal to the DREG version, ensuring that both schemes give the same physics.
We have measured the inclusive production properties of D and View the MathML source messons produced from pp interactions at View the MathML source. The differential production cross section is well represented by the empirical form View the MathML source, and the inclusive View the MathML source cross section σView the MathML source is (30.2±3.3) ωb. The QCD fusion model predicts View the MathML source production which is in good agreement with our data except for the magnitude of the cross section which depends sensitively on the assumed mass of the charm quark
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