Regular Article - Theoretical Physics
New physics in B→K ∗ μμ?
Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL, 60510, USA
2 PRISMA Cluster of Excellence & Mainz Institute for Theoretical Physics, Johannes Gutenberg University, 55099, Mainz, Germany
* e-mail: firstname.lastname@example.org
Revised: 8 October 2013
Published online: 26 November 2013
Recent experimental results on angular observables in the rare decay B→K ∗ μ + μ − show significant deviations from Standard Model predictions. We investigate the possibility that these deviations are due to new physics. Combining all relevant data on b→s rare decays, we show that a consistent explanation of most anomalies can be obtained by new physics contributing simultaneously to the semi-leptonic vector operator O 9 and its chirality-flipped counterpart . A partial explanation is possible with new physics in O 9 or in dipole operators only. We study in detail the implications for models of new physics, in particular the minimal supersymmetric standard model, models with partial compositeness and generic models with flavour-changing Z′ bosons. In all considered models, contributions to B→K ∗ μ + μ − of the preferred size imply a spectrum close to the TeV scale. We stress that measurements of CP asymmetries in B→K ∗ μ + μ − could provide valuable information to narrow down possible new physics explanations.
© Springer-Verlag Berlin Heidelberg and Società Italiana di Fisica, 2013