Ponente
Dr.
Pavel Krokovny
(Budker Institute of Nuclear Physics and Novosibirsk State University)
Descripción
Many extensions of the Standard Model (SM) introduce an additional U(1) interaction, which is mediated by a U(1) boson, often by a Higgs mechanism adding a dark Higgs (or dark Higgses) to the models. This gauge boson, also known as the dark photon, typically has very weak coupling to SM particles and of low mass (MeV to GeV). The ideal tools to discover such particles are therefore not high-energy collider experiments, but lower-energy high-luminosity collider experiments or dedicated fixed target experiments. The dark photon and dark Higgs were searched for, using the entire data set collected by Bellel ($977 fb^{-1}$) in the Higgs-strahlung channels: $e^+ e^- \to A' h'$, with $h' \to A' A'$ and $A' \to \ell^+ \ell^-$ (with $\ell = e$ or $\mu$ ) or $A' \to \pi^+ \pi^-$ and for mass ranges, respectively of $0.15 < m_{A'} < 3.5 {\rm GeV}/c^2$ and $0.5 < m_{h'} < 10.5 {\rm GeV}/c^2$. The Belle results for the prompt case analysis will be presented.
Autor primario
Prof.
Youngjoon Kwon
(Yonsei University)
