منابع مشابه
Spin dependence of diffractive DIS
The motto of high energy QCD is the quark helicity conservation which is often believed to entail the s-channel helicity conservation (SCHC) at small x. Here I review the recent work ([ 1, 2, 3, 4, 5], which shows this belief is groundless and there is an extremely rich helicity-flip physics at small x. The backbone of DIS is the Compton scattering (CS) γ μp → γ ∗ ′ ν p , which at small-x can b...
متن کاملTwist-4 effects and Q dependence of diffractive DIS
In this letter we report the direct perturbative QCD evaluation of twist-4 effects in diffractive DIS. They are large and have a strong impact on the Q dependence of diffractive structure functions at large β. Based on the AGK rules, we comment on the possible contribution from diffractive higher twists to ∝ 1 Q corrections to proton structure function at small x. These corrections to the longi...
متن کاملProduction of spin-3 mesons in diffractive DIS
We calculate the amplitudes of J = 3−− meson production in diffractive DIS within the kt-factorization approach, with a particular attention paid to the ρ3(1690) meson. We find that at all Q2 the ρ3(1690) production cross section is 2–5 times smaller than the ρ(1700) production cross section, which is assumed to be a pure D-wave state. Studying σL and σT separately, we observe domination of ρ3 ...
متن کاملSpin Dependence of Diffractive Vector Meson Production
I review the recent progress in the theory of s-channel helicity nonconservation (SCHNC) effects in diffractive DIS. SCHNC in diffractive vector meson production is an unique probe of the spin-orbit coupling and Fermi motion of quarks in vector mesons. Photoand electroproduction of the φ and its radial and angular excitations at Jlab is perfectly posed to probe SCHNC in QCD pomeron exchange. I ...
متن کاملUnified Picture of Dis and Diffractive Dis
The QCD dipole picture allows to build an unified theoretical description -based on BFKL dynamicsof the total and diffractive nucleon structure functions. We use a four parameter fit to describe the 1994 H1 proton structure function F2 data in the low x, moderate Q2 range. Without any additional parameter, the gluon density and the longitudinal structure functions are predicted. The diffractive...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 1999
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(99)00718-5