Kaon and hyperon decays shining light on dark photons

by Dr Jusak Tandean (Taiwan University)

Wednesday 9 Sep 2020, 15:00 → 16:00 Asia/Shanghai

CHEP

Abstract: If the dark photon exists and is massless, it can affect standard-model particles only via higher-dimensional operators. It would therefore have evaded the recent searches for the massive one based on its renormalizable interactions with ordinary fermions due to gauge kinetic mixing. This talk focuses on the case of massless dark photon and explores the possibility that it has flavor-changing dipole-type couplings to the down and strange quarks. These couplings give rise to the FCNC decays of strange hadrons (i.e. kaons and hyperons) into final states containing missing energy carried away by the dark photon. Interestingly, in the kaon sector there are a few such decays which are allowed by the pertinent constraints to have sizable rates potentially within the reaches of KOTO and NA62. Some of the lightest hyperons can undergo analogous decays with large rates which may be detectable by BESIII. Thus, one or more of these ongoing experiments might soon be able to offer important tests on the existence of massless dark photon. Jusak Tandean is originally from Indonesia and earned his PhD in 1997 from the University of Massachusetts Amherst in the US. Since 2008 he has worked in Taiwan as a researcher, mostly at Taiwan University. Welcome to join us via the following link: https://meeting.tencent.com/s/xrFLbF32n3xF 会议 ID：281 338 262