QCD corrections to B → X_1tnsl_1hn+l_1hn- in the standard model and beyond [Elektronische Ressource] / Christoph Bobeth

+QCD Corrections to B!X l l in thesStandard Model and BeyondChristoph BobethSeptember 2003Physik Department T31Prof. A. J. BurasPhysik{DepartmentTechnische Universitat Munc henInstitut fur Theoretische PhysikLehrstuhl Univ.-Prof. Dr. Andrzej J. Buras+QCD Corrections to B!X l l insthe Standard Model and BeyondChristoph BobethVollst andiger Abdruck der Fakult at fur Physik der Technischen Universit at Munc hen zurErlangung des akademischen Grades einesDoktors der Naturwissenschaften (Dr. rer. nat.)genehmigten Dissertation.Vorsitzender: Univ.-Prof. Dr. Stephan PaulPrufer der Dissertation:1. Univ.-Prof. Dr. Andrzej J. Buras2. Dr. Manfred LindnerDie Dissertation wurde am 28. August 2003 bei der Technischen Universit at Munc hen ein-gereicht und durch die Fakult at fur Physik am 11. September 2003 angenommen.Abstract+The inclusive semileptonic B decay B!X l l will be discussed in this work. Here Xs sdenotes an arbitrary state of total strangeness 1 and the leptons are considered to bel =eor. The theoretical predictions of inclusive quantities are preferable with respect to exclu-sive ones since non-perturbative e ects are under control in the framework of heavy quarkexpansion (HQE). The non-perturbative corrections are small in certain regions of the dilep-ton invariant mass spectrum whereas the major contribution consists in the perturbatively+calculable parton decay b!sl l .