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Transparencies pdf - Desy

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Impact parameter distribution for dijet trigger.<br />

soft<br />

hard<br />

"peripheral"<br />

(dominate total<br />

cross section)<br />

b<br />

hard dijet<br />

q T = 100 GeV<br />

x 1<br />

x 2<br />

x1,2 = 2 / W ~ 10 −2<br />

q<br />

T<br />

"central"<br />

Main idea/Qualitative expectation: hard partons are more<br />

localized in transverse plane. Hence in events with hard interaction<br />

spectator partons experience much stronger gluon fields.<br />

38<br />

b<br />

38

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