PRC: Connection between angle-dependent phase ambiguities and the uniqueness of the partial-wave decomposition

Paper published in Phys. Rev. C 97, 054611 – Published 21 May 2018

Connection between angle-dependent phase ambiguities and the uniqueness of the partial-wave decomposition 
A. Švarc, Y. Wunderlich, H. Osmanović, M. Hadžimehmedović, R. Omerović, J. Stahov, V. Kashevarov, K. Nikonov, M. Ostrick, L. Tiator, and R. Workman.


Unconstrained partial -wave amplitudes, obtained at discrete energies from fits to complete sets of eight independent observables, may be used to reconstruct reaction amplitudes. These partial-wave amplitudes do not vary smoothly with energy and are in principle nonunique. We demonstrate how this behavior can be ascribed to the continuum ambiguity. Starting from the spinless scattering case, we show how an unknown overall phase, depending on energy and angle, mixes the structures seen in the associated partial-wave amplitudes. This process is illustrated using a simple toy model. We then apply these principles to pseudoscalar meson photoproduction, showing how the above effect can be removed through a phase rotation, allowing a consistent comparison with model amplitudes. The effect of this phase ambiguity is also considered for Legendre expansions of experimental observables.


KLF Collaboration

K Long Facility


We are theoretical physicists at Faculty of Natural Sciences and Mathematics - University of Tuzla. Our group is a part of the Mainz - Tuzla - Zagreb Partial Wave Analysis collaboration.

As a part of the MTZ PWA, our results are "above the line" in PDG library.

Related sites

Physics Department >>
University of Tuzla >>
PMF Tuzla >>
Mainz-Tuzla-Zagreb PWA >>
PDG - Particle Data Group >>
MAID Mainz >>
GWU/SAID Washington >>
Bonn-Gatchina PWA >>
JPac Center Indiana Uni. >>
CLAS Phy. Database >>
JPac Center Indiana Uni. >>
ETA MAID 2018 >>
Jülich-Bonn-Washington Collaboration >>

Popular Posts