Transparencies pdf - Desy

Warning: relation between Γ(s,b) and the scattering
amplitude seems to indicate that elastic scattering occurs at
small impact parameters. In fact this is the wave goes
around the target which survived nearly complete absorption
at small b. Relevant for suppression of hard diffraction at
colliders.
Answer is the same as using Eq. from the previous slide -
complementarity principle: diffraction off the hole and
absorptive disk of the same shape are the same.
Quiz: consider scattering of a deuteron off a large absorptive nucleus so
that
σinel(pA) = σel(pA).
Select events where one nucleon went through the center (centrality
trigger). What is probability that the second nucleon scatters elastically?
10 %
50 %
0 % 36
36