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17
Extraction of the Compton Form Factor H from DVCS measurements at Je erson Lab, Phys
 Rev. D
"... In the framework of Generalised Parton Distributions, we study the helicitydependent and independent cross sections measured in Hall A and the beam spin asymmetries measured in Hall B at Jefferson Laboratory. We perform a global fit of these data and fits on each kinematical bin. We extract the real ..."
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In the framework of Generalised Parton Distributions, we study the helicitydependent and independent cross sections measured in Hall A and the beam spin asymmetries measured in Hall B at Jefferson Laboratory. We perform a global fit of these data and fits on each kinematical bin. We extract the real and imaginary parts of the Compton Form Factor H under the main hypothesis of dominance of the Generalised Parton Distribution H and twist 2 accuracy. We discuss our results and compare to previous extractions as well as to the VGG model. We pay extra attention to the estimation of errors on the extraction of H.
Sum rules and dualities for generalized parton distributions: Is there a holographic principle?
, 805
"... To leading order approximation, the physical content of generalized parton distributions (GPDs) that is accessible in deeply virtual electroproduction of photons or mesons is contained in their value on the crossover trajectory. This trajectory separates the tchannel and schannel dominated GPD re ..."
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To leading order approximation, the physical content of generalized parton distributions (GPDs) that is accessible in deeply virtual electroproduction of photons or mesons is contained in their value on the crossover trajectory. This trajectory separates the tchannel and schannel dominated GPD regions. The underlying Lorentz covariance implies a correspondence between these two regions through their relation to GPDs on the crossover trajectory. This point of view leads to a family of GPD sum rules which are a quark analogue of finite energy sum rules and it guides us to a new phenomenological GPD concept. As an example, we discuss the constraints from the JLab/Hall A data on the dominant uquark GPD H. The question arises whether GPDs are governed by some kind of holographic principle.
unknown title
, 803
"... EPJ manuscript No. (will be inserted by the editor) Forwardlike functions for dual parametrization of GPDs from the nonlocal chiral quark model ..."
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EPJ manuscript No. (will be inserted by the editor) Forwardlike functions for dual parametrization of GPDs from the nonlocal chiral quark model
unknown title
, 2008
"... EPJ manuscript No. (will be inserted by the editor) Forwardlike functions for dual parametrization of GPDs from the nonlocal chiral quark model ..."
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EPJ manuscript No. (will be inserted by the editor) Forwardlike functions for dual parametrization of GPDs from the nonlocal chiral quark model
unknown title
, 2008
"... Forwardlike functions for dual parametrization of GPDs from nonlocal chiral quark model ..."
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Forwardlike functions for dual parametrization of GPDs from nonlocal chiral quark model
LargeN Summation of Chiral Logs for Generalized Parton Distributions
, 809
"... We demonstrate that in the region of Bjorken xBj ∼ m 2 π/(4πFπ) 2 and/or xBj ∼ t/(4πFπ) 2 the standard χPT for the pion GPDs fails and one must perform all order resummation of χPT. We perform such resummation in the largeN limit of the O(N + 1) extension of the chiral theory. Explicit resummatio ..."
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We demonstrate that in the region of Bjorken xBj ∼ m 2 π/(4πFπ) 2 and/or xBj ∼ t/(4πFπ) 2 the standard χPT for the pion GPDs fails and one must perform all order resummation of χPT. We perform such resummation in the largeN limit of the O(N + 1) extension of the chiral theory. Explicit resummation allows us to reveal novel phenomena – the form of the leading chiral correction to pion PDFs and GPDs depends on the small x asymptotic of the pion PDFs. In particular, if the pion PDF in the chiral limit has the Reggelike small x behaviour q(x) ∼ 1/x ω, the leading large impact parameter (b ⊥ → ∞) asymptotics of the quark distribution in the transverse plane has the form (mπ = 0) q(x, b⊥) ∼ 1/x ω ln ω (b 2 ⊥)/b 2(1+ω). This result is model independent and it is controlled completely by the all order resummed χPT developed in this paper. This asymptotic interweaves with smallx behaviour of usual PDFs, hence it depends on the scale, at which the corresponding PDF is defined. This is a new and interesting result in which the chiral expansion meets the QCD evolution.
unknown title
, 805
"... Sum rules and dualities for generalized parton distributions: is there a holographic principle? ..."
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Sum rules and dualities for generalized parton distributions: is there a holographic principle?