Parton model functions

Fig. 5.4. Calculated parton model cross-sections for the production of W bosons in pp and pp collisions. Solid and dashed lines correspond to different assumed parton distribution functions. (Prom Quigg, 1977.)...

The above relations will be important in understanding the parton model for the structure functions Wj. 

In the following chapter we shall see how the quark-parton model explains the occurrence of Bjorken scaling and we shall obtain expressions for all the scaling functions in terms of number densities for the quark-partons in a hadron. 

Q /2mN ) plays a role. We have thus obtained the remarkable features of the deep inelastic structure functions mentioned earlier, and satisfied the Bjorken result (15.5.4). Indeed, in the above naive parton model we have... 

Thus the parton model expressions for the scaling functions to be used in (15.5.9) are ... 

This completes the specification of the quark-parton model formulae for the scaling functions relevant to scattering on an unpolarized nucleon target in the region [Pg.374]

In Section 15.6 we introduced the formalism necessary for studying deep inelastic scattering using polarized electron or muon beams on polarized nucleon targets. Here we briefly present the parton model predictions for the structure functions Gi,2 and consider what may be learnt from the experiments with polarized beams and targets. 

Let us now look at some of the relations amongst the scaling functions in the quark-parton model. We shall see that where these have been tested the results are, with one exception at present, generally in agreement with the predictions. 

Part of these discrepancies can be attributed to the fact that many of these models are based on a limited number of empirical studies. In Century, the temperature response function that is the same for all pools of carbon was derived from the Sprensen (1981) 90-day laboratory incubation study on the decomposition of labeled cellulose at three different temperatures (10 °C, 20 °C, and 30 °C) (Parton et aL, 1987). It is unlikely that... 

---