Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-01-11
Nucl.Phys. B425 (1994) 489-515
Physics
High Energy Physics
High Energy Physics - Phenomenology
34 pages, LaTeX
Scientific paper
10.1016/0550-3213(94)90285-2
We calculate the leading twist contribution to near-forward proton-proton (and proton-antiproton) elastic scattering with large momentum transfer, in the multiple scattering (Landshoff) mechanism. The amplitude in the near-forward region is dominated by singlet exchange for all three valence quark-quark scatterings. We assume the existence of a hard singlet quark-quark amplitude, which we estimate to be ${\cal O}(\alpha_s^2/t)$. For a three-quark state whose transverse size is less than $1/\Lambda_{\rm QCD}$, Sudakov resummation accounts for both approximate $\d \sigma^{pp}/ \d t \sim t^{-8}$ at moderate $t$, and $\d \sigma^{pp}/ \d t \sim t^{-10}$ at larger $t$. The transition from approximate $t^{-8}$ to $t^{-10}$ behavior is strongly correlated with the transverse size of the valence three-quark state in the proton.
Sotiropoulos Michael G.
Sterman George
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