Hard diffractive electroproduction, transverse momentum distribution, and QCD vacuum structure
- Physics and Astronomy Department, University of British Columbia, 6224 Agriculture Road, Vancouver, BC V6T 1Z1 (Canada)
We study the impact of the {open_quotes}intrinsic{close_quotes} hadron transverse momentum on the pre-asymptotic behavior of the diffractive electroproduction of a longitudinally polarized {rho} meson. Surprisingly, we find the onset of the asymptotic regime in this problem to be rather low, Q{sup 2}{approx_equal}10 GeV{sup 2} where power corrections due to the transverse momentum do not exceed 20{percent} in the amplitude. This drastically contrasts with exclusive amplitudes where the asymptotics start much higher, Q{sup 2}=50{endash}100 GeV{sup 2}. The sources of such unexpected behavior are traced back to some general (the quark-hadron duality) as well as more silent (properties of higher dimensional vacuum condensates) features of QCD. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 531958
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 1 Vol. 56; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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