Transparencies pdf - Desy
Transparencies pdf - Desy
Transparencies pdf - Desy
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HERA data confirm increase of the cross sections of small<br />
dipoles predicted by pQCD<br />
2<br />
(d , x, Q ) (mb)<br />
qqN<br />
−<br />
!<br />
45<br />
40<br />
35<br />
Hard 30<br />
Regime<br />
25<br />
20<br />
15<br />
10<br />
5<br />
0<br />
0<br />
"<br />
"<br />
0.1<br />
Matching Region<br />
= 4 x = 0.0001<br />
= 10<br />
0.2<br />
0.3<br />
0.4<br />
0.5<br />
d (fm)<br />
0.6<br />
x = 0.001<br />
x = 0.01<br />
The interaction cross-section, ˆσ for CTEQ4L, x = 0.01, 0.001, 0.0001,<br />
λ = 4, 10. Based on pQCD expression for ˆσ at small dt, soft dynamics at<br />
large b, and smooth interpolation. Provides a good description of F2p at<br />
HERA and J/ψ photoproduction.<br />
Frankfurt, Guzey, McDermott, MS 2000-2001<br />
0.7<br />
0.8<br />
Provided a reasonable prediction for σL<br />
27<br />
Soft<br />
Regime<br />
0.9<br />
1<br />
27
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