phi meson electroproduction at low transferred momentum

0 – Meson Electroproduction at HERMES

The work described in this thesis is part of the research program of the " Stichting voor Funda-menteel Onderzoek der Materie (FOM) " , which is financially supported by the " Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) ". If you understand, things are as they are. If you do not understand, things are as they are.

Exclusive vector meson electroproduction at HERA

Exclusive electroproduction of light vector mesons is a particularly good process for studying the transition from the soft to the hard regime of strong interactions, the former being well described within the Regge phenomenology while the latter by perturbative QCD (pQCD). Among the most striking expectations [1] in this transition is the change of the logarithmic derivative δ of the cross sec...

Threshold pion electroproduction at large momentum transfers

Duality in Meson Electroproduction

We propose to study quark-hadron duality in meson electroproduction. While duality between inclusive electron-hadron scattering in the resonance and deep inelastic regimes (Bloom-Gilman or quark-baryon duality) is well established, the existence of a similar duality in meson electroproduction has not yet been tested. In the inclusive case, duality implies that single-quark scattering governs th...

Electroproduction of Rho and Phi Mesons

We report measurements of p” and $ electroproduction at 19.5 GeV in a wide-aperture spectrometer which detected the scattered electron and the decay products of the vector mesons. As Iq 2 I increases, the rho mass spectrum shape changes, the momentum transfer distribution broadens, and the ratio of the rho cross section to the total cross sec,“i tion decreases. The ratio of longitudinally to tr...