An alternative subtraction scheme using Nagy-Soper dipoles [Elektronische Ressource] / Cheng Chung

An alternative subtraction scheme usingNagy-Soper dipolesVon der Fakulta¨t fu¨r Mathematik, Informatik und Naturwissenschaften derRheinisch-Westfa¨lischen Technischen Hochschule Aachenzur Erlangung des akademischen Grades eines Doktors derNaturwissenschaften genehmigte Dissertationvorgelegt vonM.Sc. in PhysicsCheng Han Chungaus Zhubei, TaiwanReferent: Universita¨tsprofessor Michael Kra¨merKorreferent: Universita¨tsprofessor Michal CzakonTag der mu¨ndlichen Pru¨fung: 21 Juni 2011Diese Dissertation ist auf den Internetseiten der Hochschulbibliothekonline verfu¨gbar.AbstractIn this thesis we address an alternative subtraction scheme in high energy colliders at Next-to-Leading Order (NLO) QCD calculations. In particular, we focus on the treatment of realradiation contributions in the soft and collinear limits. After UV-renormalization, the remaininginfrared singularities appearing both in the real radiation and in the virtual contributions can beregularized using dipole subtraction method. In this scheme, dipoles are based on the momentummapping and on the splitting functions derived from an improved parton shower formulationwith quantum interference effects. In our new scheme, we employ a slightly altered momentummapping such that the number of subtraction terms is greatly reduced in comparison with thestandard Catani-Seymour scheme.