Exclusive ρ Production by Virtual Photons

The cross section for production of ρ0 mesons has been measured in the reaction e+p→e+p+π++π-. The cross section is presented as a function of W, the c.m. energy of the virtual-photon-proton system, and -Q2, the square of the virtual-photon mass. The vector-dominance model is not able to describe th...
Ausführliche Beschreibung

The cross section for production of ρ0 mesons has been measured in the reaction e+p→e+p+π++π-. The cross section is presented as a function of W, the c.m. energy of the virtual-photon-proton system, and -Q2, the square of the virtual-photon mass. The vector-dominance model is not able to describe the dependence of the cross section on the parameters Q2 and W. The slope parameter B describing the scattering of the proton exhibits a significant variation with Q2. Ausführliche Beschreibung