325 citations · 1.7k across the 44 of their papers we have counts for
36 papers · 1 filter
Inequalities for nucleon generalized parton distributions with helicity flip
M. Kirch, P. V. Pobylitsa, K. Goeke
Several positivity bounds are derived for generalized parton distributions (GPDs) with helicity flip.
Baryon wave function: Large-Nc QCD and lessons from models
P. V. Pobylitsa
The structure of the 1/Nc expansion for the baryon distribution amplitude in QCD is tested using quark models. Earlier conjectures about this structure based on the evolution equat…
Baryon distribution amplitude: Large-Nc factorization, spin-flavor symmetry and soft-pion theorem
P. V. Pobylitsa
The 1/N_c expansion for the baryon distribution amplitude is constructed in terms of a specially designed generating functional. At large N_c this functional shows exponential beha…
Exotic baryons and the large-Nc expansion
P. V. Pobylitsa
The status of exotic baryons is analyzed in the limit of a large number of colors Nc. Several toy models reproducing the main features of the large-Nc QCD are studied in order to c…
Lorentz invariance relations among parton distributions revisited
K. Goeke, A. Metz, P. V. Pobylitsa +1
We revisit the derivation of the so-called Lorentz invariance relations between parton distributions. In the most important cases these relations involve twist-3 and transverse mom…
Transverse-momentum dependent parton distributions in large-Nc QCD
P. V. Pobylitsa
The transverse-momentum dependent quark distributions are studied in the limit of the large number of colors Nc. The leading orders of Nc are determined for all twist-2 distributio…
T-odd quark distributions: QCD versus chiral models
P. V. Pobylitsa
The T-odd quark distrbutions are shown to vanish in the chiral sigma model in contrast to the opposite widespread opinion. This failure of the chiral sigma model is a feature of th…
Virtual Compton scattering in the generalized Bjorken region and positivity bounds on generalized parton distributions
P. V. Pobylitsa
The positivity bounds on generalized parton distributions are derived from the positivity properties of the absorptive part of the amplitude of the virtual Compton scattering in th…
Spontaneously Broken Chiral Symmetry and Hard QCD Phenomena
M. J. Amarian, V. M. Braun, S. J. Brodsky +28
These are the mini-proceedings of the workshop ``Spontaneously Broken Chiral Symmetry and Hard QCD Phenomena" held at the Physikzentrum Bad Honnef from July 15 to 19, 2002. Every a…
Integral representations for nonperturbative GPDs in terms of perturbative diagrams
P. V. Pobylitsa
An integral representation is suggested for generalized parton distributions which automatically satisfies the polynomiality and positivity constraints. This representation has the…
Solution of polynomiality and positivity constraints on generalized parton distributions
P. V. Pobylitsa
An integral representation for generalized parton distributions of spin-0 hadrons is suggested, which satisfies both polynomiality and positivity constraints.
Positivity bounds on generalized parton distributions in impact parameter representation
P. V. Pobylitsa
New positivity bounds are derived for generalized (off-forward) parton distributions using the impact parameter representation. These inequalities are stable under the evolution to…
Positivity bounds on parton distributions at large N_c
P. V. Pobylitsa
Positivity bounds for twist-two parton distributions in multicolored QCD are stronger than their analogs at finite . They include the enhanced large version of Soffer…
Disentangling positivity constraints for generalized parton distributions
P. V. Pobylitsa
Positivity constraints are derived for the generalized parton distributions (GPDs) of spin-1/2 hadrons. The analysis covers the full set of eight twist-2 GPDs. Several new inequali…
Inequalities for generalized parton distributions H and E
P. V. Pobylitsa
New positivity bounds are derived for quark and gluon generalized parton distributions and in spin 1/2 hadrons.
Soft pion theorem for hard near threshold pion production
P. V. Pobylitsa, M. V. Polyakov, M. Strikman
We prove new soft pion theorem for the near threshold pion production by a hard electromagnetic probe. This theorem relates various near threshold pion production amplitudes to the…
Transversity distributions in the nucleon in the large-N_c limit
P. Schweitzer, D. Urbano, M. V. Polyakov +3
We compute the quark and antiquark transversity distributions in the nucleon at a low normalization point of 600 MeV in the large- limit, where the nucleon can be described as…
Meson twist-4 parton distributions in terms of twist-2 distribution amplitudes at large Nc
N. -Y. Lee, P. V. Pobylitsa, M. V. Polyakov +1
We show that in the large N_c limit four-quark twist-4 distributions in the pion can be expressed in terms of twist-2 pion distribution amplitude. This allows us to compute the iso…
Gluon and quark distributions in large N_c QCD: theory vs. phenomenology
A. V. Efremov, K. Goeke, P. V. Pobylitsa
We present the QCD analysis of the behavior of quark and gluon distributions in the limit of a large number of colors N_c. We show that the results agree qualitatively with the phe…
New positivity bounds on polarized parton distributions in multicolored QCD
P. V. Pobylitsa, M. V. Polyakov
We derive new positivity bounds on spin-dependent parton distributions in multicolored QCD. They are stronger than Soffer inequality. We check that the new inequalities are stable…
Polarized antiquark distributions from chiral quark-soliton model: summary of the results
K. Goeke, P. V. Pobylitsa, M. V. Polyakov +1
In these short notes we present a parametrization of the results obtained in the chiral quark-soliton model for polarized antiquark distributions , and …
Quark distribution functions in the chiral quark-soliton model: cancellation of quantum anomalies
K. Goeke, P. V. Pobylitsa, M. V. Polyakov +2
In the framework of the chiral quark-soliton model of the nucleon we investigate the properties of the polarized quark distribution. In particular we analyse the so called anomalou…
Hard diffractive electroproduction of two pions
B. Lehmann-Dronke, P. V. Pobylitsa, M. V. Polyakov +2
We have calculated the leading order amplitude of hard diffractive electroproduction of two pions in lepton nucleon scattering. At the leading twist level a pion pair can be produc…
Hard exclusive pseudoscalar meson electroproduction and spin structure of a nucleon
L. L. Frankfurt, P. V. Pobylitsa, M. V. Polyakov +1
The amplitude for hard exclusive pseudoscalar meson electroproduction off nucleon (nuclear) targets is computed in QCD within the leading approximation.…