Speaker
Ruth Schäfer
(Universität Heidelberg)
Description
I will present a new search for light scalar singlets in rare meson decays. For tiny interactions, the scalar is long-lived at detector scales and decays into displaced pairs of leptons or light mesons. I will show that Belle II has a remarkable potential to probe scalars in the GeV range with couplings as small as $10^{−5}$. The predicted sensitivity is higher than at the long-baseline experiments FASER and NA62. I will also discuss signatures of invisibly decaying scalars in rare meson decays with missing energy.
Primary authors
Anastasiia Filimonova
(Heidelberg University)
Ruth Schäfer
(Universität Heidelberg)
Susanne Westhoff
(Heidelberg University)
