Gluon radiation in diffractive electroproduction
نویسندگان
چکیده
منابع مشابه
Gluon Radiation in Diffractive Electroproduction
Order αs-corrections to the diffractive structure functions F D L and F D 2 at large Q 2 and small x are evaluated in the semiclassical approach, where the initial proton is treated as a classical colour field. The diffractive final state contains a fast gluon in addition to a quark-antiquark pair. Two of these partons may have large transverse momentum. Our calculations lead to an intuitive pi...
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Due to the momentum transfer r ≡ p − p′ from the initial proton to the final, the “asymmetric” matrix element 〈p′|G . . . G|p〉 that appears in the pQCD description of hard diffractive electroproduction does not coincide with that defining the gluon distribution function fg(x). I outline a pQCD formalism based on a concept of a double distribution Fg(x, y), which specifies the fractions xp, yr, ...
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In the following, the term ‘diffractive electroproduction’ or ‘diffractive deep inelastic scattering (DIS)’ is used to characterize those processes in small-x DIS where, in spite of the high virtuality of the exchanged photon, the proton target remains intact or almost intact. Thus, the term is used synonymously with the expression ‘rapidity gap events in DIS’. Historically, the term diffractio...
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The diffractive production of high-p⊥ jets in deep-inelastic scattering is studied in the semiclassical approach. The p⊥-spectra of qq̄ and qq̄g diffractive final states are found to be qualitatively different. For qq̄ final states, which are produced by ‘hard’ colour-singlet exchange, the p⊥-spectrum is much softer than for qq̄g final states, where the colour neutralization is ‘soft’. Furthermore,...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 1997
ISSN: 0550-3213
DOI: 10.1016/s0550-3213(96)00623-2