Skewed parton distributions
نویسندگان
چکیده
منابع مشابه
Skewed Parton Distributions ∗
Applications of perturbative QCD to deeply virtual Compton scattering and hard exclusive electroproduction processes require a generalization of usual parton distributions for the case when long-distance information is accumulated in nonforward matrix elements of quark and gluon light-cone operators. We describe two types of nonperturbative functions parametrizing such matrix elements: double d...
متن کاملTHE b − u SKEWED PARTON DISTRIBUTIONS
The b-u skewed parton distributions (SPDs) are discussed. The SPDs allow an un-ambigous superposition of overlap and resonsance contributions and their zeroth order moments represent the B → π transition form factors. The values of the form factors at maximum recoil are found to be F + (0) = F 0 (0) = 0.22 ± 0.05 in agreement with measurements of the B → ππ branching ratio. The branching ratios...
متن کاملExploring Skewed Parton Distributions with Polarized Targets
I brie y review the physics of skewed parton distributions. Special emphasis is put on the relevance of target polarization, and on the di erent roles of small and of intermediate xB. 1 The physics of skewed parton distributions In recent years much progress has been made in the theory of skewed parton distributions (SPDs). Unifying the concepts of parton distributions and of hadronic form fact...
متن کاملExtraction of skewed parton distributions from experiment
The basic concept of SPD’s [ 1, 2, 3, 4, 5] is best illustrated with the lowest order graph of deeply virtual Compton scattering (DVCS) in which a quark of momentum fraction x1 leaves the proton and is returned to it with x2. The two fractions not being equal is due to the fact that an on-shell photon is produced which necessitates a change in the + momentum in going from the virtual space-like...
متن کاملSkewed parton distributions for B → π transitions
We investigate the b-u skewed parton distributions (SPDs) for B → π transitions and determine the contributions from several sources (overlaps of soft light-cone wave functions, quark-antiquark annihilations and meson resonances). The B → π transition form factors, which are relevant in exclusive semi-leptonic and non-leptonic B-decays, are obtained by integrating the b-u SPDs over the momentum...
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ژورنال
عنوان ژورنال: Nuclear Physics A
سال: 2000
ISSN: 0375-9474
DOI: 10.1016/s0375-9474(00)00031-2