ƞ and ƞ' photoproduction with ƞMAID including Regge phenomenology

Mar 13, 2017, 11:30 AM
30m
Lecture Hall (Bad Honnef)

Lecture Hall

Bad Honnef

Topic 1: Spectroscopy of Baryons, Light- and Heavy-Quark Mesons Session

Speaker

Dr Viktor Kashevarov (Institut f ̈ur Kernphysik, Johannes Gutenberg-Universitat Mainz)

Description

We present a new version of the $\eta$MAID model for $\eta$ and $\eta'$
photoproduction on proton and neutron.
The model includes 23 nucleon resonances parameterized with Breit-Wigner shapes.
The background is described by vector and axial-vector meson exchanges in the
$t$ channel using the Regge cut phenomenology.
Parameters of the resonances were obtained from a fit to the new experimental data of the A2
Collaboration and available data from CBELSA/TAPS, CLAS, and GRAAL Collaborations.
%for $\eta$ and $\eta'$ photoproduction on protons and neutrons.
Dominant role of $1/2^-$ resonances is discussed.
The total cross section for $\eta$ photoproduction demonstrates a cusp at the energy
W$\sim$1.9~GeV.
The cusp is explained as a threshold effect due to the opening $\eta' p$ decay channel
of the $N(1895)1/2^-$ resonance.

Primary authors

Dr Viktor Kashevarov (Institut f ̈ur Kernphysik, Johannes Gutenberg-Universitat Mainz) Michael Ostrick (University Mainz) Lothar Tiator (Institut fur Kernphysik, Universitat Mainz, D-55099 Mainz, Germany)

Presentation materials