Diffractive photon dissociation is the dominant contribution to the diffractive cross-section  diff at large M X in DIS:  elas : involves the qq dipole fluctuation, dominant for small-mass final states  dissoc : involves higher Fock state fluctuations: qqg, …dominant for large- mass final states Diffractive jet production (1)  = Q²/M X ² <<1 rapidity gap  = log(1/x pom ) x pom <<1 target proton k: transverse momentum of the final-state gluon C.
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