University of Pennsylvania
Department of Physics and Astronomy
High Energy Physics Seminar
Event Shapes and Power Corrections in ep DIS
Klaus Rabbertz
Abstract
Deep-inelastic ep scattering data, taken with the H1 detector at HERA,
are used to study the event shape variables thrust, jet broadening,
jet mass, C parameter and two kinds of differential two-jet rate. The
data cover a large range of the four-momentum transfer Q, which is
considered to be the relevant energy scale, between 7 GeV and 100 GeV.
The Q dependences of the mean values are compared with second order
calculations of perturbative QCD applying power law corrections
proportional to 1/Q^p to account for hadronization effects. The
concept of power corrections is investigated by fitting simultaneously
a non-perturbative parameter alpha_p and the strong coupling constant
alpha_s.