July 31, 2017 to August 4, 2017
Fermi National Accelerator Laboratory
US/Central timezone

New Physics in b -> s mu+ mu- after the Measurement of R_K*

Aug 2, 2017, 10:45 AM
Curia II (Fermi National Accelerator Laboratory)

Curia II

Fermi National Accelerator Laboratory

Presentation Quark and Lepton Flavor Quark and Lepton Flavor


Prof. David London (Universite de Montreal)


The recent measurement of R_K* is yet another hint of new physics (NP), and supports the idea that it is present in b -> s mu+ mu- decays. Others have performed model-independent analyses, finding that the NP must obey one of two scenarios: (I) C_9(NP) < 0 or (II) C_9(NP) = -C_10(NP) < 0. We confirm this, and show that more information about the NP can be obtained by combining this result with a model-dependent analysis. The simplest NP models involve the tree-level exchange of a leptoquark (LQ) or a Z' boson. We show that scenario (II) can arise in LQ or Z' models, but scenario (I) is only possible with a Z'. Fits to Z' models must take into account the additional constraints from Bs-Bsbar mixing and neutrino trident production.

Primary author

Prof. David London (Universite de Montreal)


Prof. Alakabha Datta (University of Mississippi) Prof. Ashutosh Kumar Alok (Indian Institute of Technology Jodhpur) Dr Bhubanjyoti Bhattacharya (Wayne State University) Prof. Dinesh Kumar (University of Rajasthan) Dr Jacky Kumar (Tata Institute of Fundamental Research)

Presentation materials