arXiv subjects

O. Bartholomy

Publications and source records attributed to O. Bartholomy.

20 records · Page 2Linked to original sources

arXiv2007

Photoproduction of pi0-mesons off protons from the Delta(1232) region to E(gamma) = 3 GeV

Photoproduction of pi0 mesons was studied with the Crystal-Barrel detector at ELSA for incident energies from 300 MeV to 3 GeV. Differential cross sections d sigma /d Omega, d sigma/d t, and the total cross section are presented. For E(gamma) < 3 GeV, the angular distributions agree well with the SAID parametrization. At photon energies above 1.5 GeV, a strong forward peaking indicates t-channel exchange to be the dominant process. The rapid variations of the cross section with energy and angle indicate production of resonances. An interpretation of the data within the Bonn-Gatchina partial wave analysis is briefly discussed.

nucl-ex↗

arXiv2005

Photoproduction of Baryons Decaying into N pi and N eta

A combined analysis of photoproduction data on γp to πN, eta N was performed including the data on K Lambda and K Sigma. The data are interpreted in an isobar model with s--channel baryon resonances and pi, rho,(omega), K, and K^* exchange in the t--channel. Three baryon resonances have a substantial coupling to eta N, the well known N(1535)S_{11}, N(1720)P_{13}, and N(2070)D_{15}. The inclusion of data with open strangeness reveals the presence of further new resonances, N(1840)P_{11}, N(1875)D_{13} and N(2170)D_{13}.

hep-ex↗