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9 papers · 2 filters
Extracting -wave scattering lengths from cusp effect in heavy quarkonium dipion transitions
Xiao-Hai Liu, Feng-Kun Guo, Evgeny Epelbaum
Charge-exchange rescattering leads to a cusp effect in the invariant mass spectrum of processes with in the final state which can be used to me…
Complex-mass scheme and perturbative unitarity
T. Bauer, J. Gegelia, G. Japaridze +1
We derive cutting rules for loop integrals containing propagators with complex masses. Using a field-theoretical model of a heavy vector boson interacting with a light fermion, we…
New insights into the spin structure of the nucleon
V. Bernard, E. Epelbaum, H. Krebs +1
We analyze the low-energy spin structure of the nucleon in a covariant effective field theory with explicit spin-3/2 degrees of freedom to third order in the small scale expansion.…
Magnetic moment of the Roper resonance
T. Bauer, J. Gegelia, S. Scherer
The magnetic moment of the Roper resonance is calculated in the framework of a low-energy effective field theory of the strong interactions. A systematic power-counting procedure i…
Pion-photon transition form factor in light-cone sum rules
A. V. Pimikov, A. P. Bakulev, S. V. Mikhailov +1
We extract constraints on the pion distribution amplitude from available data on the pion-photon transition form factor in the framework of light-cone sum rules. A pronounced discr…
On chiral corrections to nucleon GPD
Alena M. Moiseeva, Alexey A. Vladimirov
Within the pion-nucleon chiral perturbation theory we derive the leading chiral correction to the nucleon GPD at . We discuss the difficulties of consideration of nonlocal lig…