Hunting New Animalcula with Rare K and B Decays

2024/11/05 by Buras, Andrzej J.
#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.2411.03440

Abstract

We summarize the recent strategy for an efficient hunting of new animalcula with the help of rare K and B decays that avoids the use of the V_cb and V_ub parameters that are subject to tensions between their determinations from inclusive and exclusive decays. In particular we update the values of the V_cb-independent ratios of various K and B decay branching ratios predicted by the Standard Model. We also stress the usefulness of the V_cb-γ plots in the search for new physics. We select the magnificant seven among rare K and B decays that should play a leading role in the search for new physics due to their theoretical cleanness: B⁺→ K⁺(K^*)νν and K⁺→π⁺νν measured recently by Belle II and NA62, respectively, K_L→π⁰νν investigated by KOTO and also B_s,d→μ⁺μ^- and K_S→μ⁺μ^- measured by the LHCb, CMS and ATLAS experiments at CERN. %

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