Transparencies pdf - Desy
Transparencies pdf - Desy
Transparencies pdf - Desy
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Impact parameter distribution in “h”(dipole)p interaction<br />
Study of the elastic scattering allows to determine how the strength of the<br />
interaction depends on the impact parameter, b:<br />
Z<br />
Γh(s,b) = 1<br />
2is<br />
Z<br />
σtot = 2<br />
σel =<br />
σinel =<br />
Note that elastic unitarity:<br />
1<br />
(2π) 2<br />
Z<br />
Z<br />
d 2 qe iqb AhN(s,t)<br />
d 2 bReΓ(s,b)<br />
d 2 b|Γ(s,b)| 2<br />
d 2 b(1 − (1 − ReΓ(s,b)) 2 − [ImΓ(s,b)] 2<br />
Γ(b) = 1 ≡ σinel = σel<br />
- black disk limit -BDL<br />
; ImA = sσtot exp(Bt/2)<br />
1<br />
2 ImA = |A|2 + ... allows Γ(b) ≤ 2<br />
)<br />
28