2014/09/16 by Buras, Andrzej J., Girrbach-Noe, Jennifer, Niehoff, Christoph +1
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.1409.4557
We present an analysis of the rare exclusive B decays B→ Kνν and B→ K*νν within the Standard Model (SM), in a model-independent manner, and in a number of new physics (NP) models. Combining new form factor determinations from lattice QCD with light-cone sum rule results and including complete two-loop electroweak corrections to the SM Wilson coefficient, we obtain the SM predictions BR(B+→ K+νν) = (4.0 ± 0.5) × 10-6 and BR(B0→ K* 0νν) = (9.2±1.0) × 10-6, more precise and more robust than previous estimates. Beyond the SM, we make use of an effective theory with dimension-six operators invariant under the SM gauge symmetries to relate NP effects in b→ sνν transitions to b→ sℓ+ℓ- transitions and use the wealth of experimental data on B→ K(*)ℓ+ℓ- and related modes to constrain NP effects in B→ K(*)νν. We then consider several specific NP models, including Z' models, the MSSM, models with partial compositeness, and leptoquark models, demonstrating that the correlations between b→ sνν observables among themselves and with Bs→μ+μ- and b→ sℓ+ℓ- transitions offer powerful tests of NP with new right-handed couplings and non-MFV interactions.