Rare FCNC top, beauty and charm decays

Abstract

Rare flavour changing neutral current (FCNC) decays of top, beauty and charm quarks can provide a powerful probe for as yet unobserved particles. Recent results on FCNC $b\to s$, $c\to u$ and $t$ transitions from the LHC experiments are reviewed. Particular attention is paid to the angular distribution of the $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decay, where a measurement performed by LHCb shows a local discrepancy of 3.7 standard deviations with respect to the SM prediction. Using the decay $B^{+}\to K^{+}{\pi }^{-}{\pi }^{+}\gamma$, LHCb have also been able to demonstrate the polarisation of photons produced in $b\to s\gamma$ transitions. More work is needed both experimentally and theoretically to understand if the Standard Model description of these rare FCNC processes is correct.

arXiv commentProceedings for LHCP 2014 conference

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