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Unformatted text preview: W using Eq. (1) above, or, equivalently, from the following diagram: p q W cut (In order to stick to the same notation as in Eq. (3), there is no need to put in the initial state phase space factors.) d. (10 pts) Using the results of parts b and c show that 2 Im [ i T ] = W . Also show that W is obtained from T in Eq. (3) by replacing the quark propagator in the Frst term i [ ( p + q ) + m ] ( p + q ) 2-m 2 + i- (2 ) [ ( p + q ) + m ] (+) [( p + q ) 2-m 2 ] and doing a similar replacement for the quark propagator in the second term in Eq. (3). 2...
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