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12 papers · 2 filters
Structure of the Energy-Momentum Tensor and Applications
Jonathan Hudson, Irina A. Perevalova, Maxim V. Polyakov +1
The probably most fundamental information about a particle is contained in the matrix elements of its energy momentum tensor (EMT) which are accessible from hard-exclusive reaction…
Nucleon tomography. What can we do better today than Rutherford 100 years ago?
N. G. Stefanis, Constantia Alexandrou, Tanja Horn +2
A survey is presented on the current status of 3D nucleon tomography. Several research frontiers are addressed that dominate modern physics from theory to current and future experi…
Improved estimates of the pion-photon transition form factor in the ~GeV range and their theoretical uncertainties
S. V. Mikhailov, A. V. Pimikov, N. G. Stefanis
We consider the pion-photon transition form factor at low to intermediate spacelike momenta within the theoretical framework of light-cone sum rules. We derive predictions which ta…
The width of the -resonance at two loop order in baryon chiral perturbation theory
Jambul Gegelia, Ulf-G. Meißner, Dmitrij Siemens +1
We calculate the width of the delta resonance at leading two-loop order in baryon chiral perturbation theory. This gives a correlation between the leading pion-nucleon-delta and pi…
Pion mean fields and heavy baryons
Ghil-Seok Yang, Hyun-Chul Kim, Maxim V. Polyakov +1
We show that the masses of the lowest-lying heavy baryons can be very well described in a pion mean-field approach. We consider a heavy baryon as a system consisting of the …
On LHCb pentaquarks as a baryon-psi(2S) bound state -- prediction of isospin 3/2 pentaquarks with hidden charm
I. A. Perevalova, M. V. Polyakov, P. Schweitzer
The pentaquark recently discovered by LHCb has been interpreted as a bound state of and nucleon. The charmonium-nucleon interaction which provides the binding…