title: B(s,d)→ℓ(+)ℓ(-) in the standard model with reduced theoretical uncertainty.
abstract: We combine our new results for the O(αem) and O(αs2) corrections to Bs,d→ℓ+ℓ-, and present updated branching ratio predictions for these decays in the standard model. Inclusion of the new corrections removes major theoretical uncertainties of perturbative origin that have just begun to dominate over the parametric ones. For the recently observed muonic decay of the Bs meson, our calculation gives B¯(Bs→μ+μ-)=(3.65±0.23)×10-9.
authors.affiliation: Excellence Cluster Universe and TUM-IAS, Technische Universität München, D-85748 Garching, Germany.
authors.forename: Christoph
authors.initials: C
authors.lastname: Bobeth
authors.affiliation: Excellence Cluster Universe and TUM-IAS, Technische Universität München, D-85748 Garching, Germany and Department of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX, United Kingdom.
authors.forename: Martin
authors.initials: M
authors.lastname: Gorbahn
authors.affiliation: Institut für Theoretische Teilchenphysik, Karlsruhe Institute of Technology (KIT), D-76128 Karlsruhe, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Hermann
authors.affiliation: Institute of Theoretical Physics, University of Warsaw, Hoża 69, PL-00-681 Warsaw, Poland and Theory Division, CERN, CH-1211 Geneva 23, Switzerland.
authors.forename: Mikołaj
authors.initials: M
authors.lastname: Misiak
authors.affiliation: Excellence Cluster Universe and TUM-IAS, Technische Universität München, D-85748 Garching, Germany and Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 76100, Israel.
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Stamou
authors.affiliation: Institut für Theoretische Teilchenphysik, Karlsruhe Institute of Technology (KIT), D-76128 Karlsruhe, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Steinhauser