Dipole showers and automated NLO matching in Herwig++

Abstract

Abstract We report on the implementation of a coherent dipole shower algorithm along with an automated implementation for dipole subtraction and for performing powheg- and mc@nlo-type matching to next-to-leading order (NLO) calculations. Both programs are implemented as add-on modules to the event generator Herwig++. A preliminary tune of parameters to data acquired at LEP, HERA and Drell-Yan pair production at the Tevatron has been performed, and we find an overall very good description which is slightly improved by the NLO matching.

Keywords

• Transverse Momentum
• Parton Shower
• Subtraction Term
• Real Emission
• Final State Radiation