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Transparencies pdf - Desy

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Can use hard diffraction<br />

to check proximity to BDL<br />

g, q, q −<br />

x P<br />

H<br />

t<br />

M X<br />

Hard scattering<br />

process<br />

Diffractive<br />

parton<br />

distribution<br />

QCD factorization theorem for diffractive processes consistent with<br />

the data to define universal diffractive parton densities:<br />

f D j ( x<br />

xIP<br />

,Q 2 ,xIP,t)<br />

30

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