TABLE OF CONTENTS We have mentioned several times that the Standard Model appears to be in complete agreement with all measurements. In fact, with the exception of the surprising result that neutrinos possess finite mass, there have been no confirmed deviations between data and predictions of the Model. In this chapter, we provide comparisons with data, and expand somewhat on the phenomenological implications of the Standard Model.
As example of the kind of agreement that has been observed between expectations from QCD and collisions studied at high energies, we show in Figs. 14.1 and 14.2, respectively, the data and theoretical predictions for production of W and Z bosons and for production of particle jets (quarks and gluons that form, or evolve into, color-neutral particles) in antiproton-proton collisions. The differential production cross section as a function of any variable, e.g., transverse momentum p T , can be written schematically in QCD, in terms of the elastic scattering of a parton a from hadron A and a parton b from hadron B, as
| (14.1) |  |
where the term 
refers to the point cross section for elastic scattering of the two partons, and can be calculated from fundamental principles of quantized field theory, x i is the fraction of the momentum of hadron I carried by parton i, f I (x i , ) represents the momentum distribution of parton i within hadron I at the...
