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The parton model as an impulse approximation

Let us consider the nucleon as a bound state of several constituents. In what way does it differ significantly from other bound state systems such as atoms or nuclei The most important difference lies in the ratio of binding energy to total energy or mass of the constituents  [Pg.382]

The higher the ratio, the more important is the potential energy of the constituent, and this has two consequences  [Pg.382]

If in a given reference frame we imagine taking a snapshot of the target as seen by the projectile we may see a set of constituents of mass mj and [Pg.382]

The impulse approximation treats the colhsion of the projectile with the constituent as if the latter were a free p ui icle. It will be a valid approximation when  [Pg.383]

the time of interaction 7i t between the projectile and the constituent is much smaller than ry, so that the constituent is basically free during the period of its interaction with the projectile, and [Pg.383]


In the appendix to this chaper we shall develop a picture of the parton model as an impulse approximation in which better control of kinematic effects is possible. It turns out from eqn (16.9.36) that for CC reactions involving a transition from a light quark j to a heavy qumrk k the principal kinematic corrections are the following ... [Pg.369]


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