Speaker
Prof.
Gerald Eigen
(University of Bergen)
Description
A new class of dark matter models introduces a dark sector with new Dirac fermions charged under an additional U(1) gauge group. The corresponding gauge boson, the dark photon $A'$, has a MeV-GeV mass and couples to the Standard Model photon (and Z) via kinetic mixing. Fermionic bound states ("darkonium" $\Upsilon_D$) could form if the dark sector coupling constant is strong enough. We present a search for dark sector bound states ($\Upsilon_D$) in $e^{+}e^{-}\to \gamma \Upsilon_{D}$, $\Upsilon_{D}\to A'A'A'$, $A'\to X^{+}X^{-}$ $(X=e, \mu, \pi)$ decays for $0.02~\text{GeV} \leq m_{A'} \leq 1.0~\text{GeV}$, $1~\text{GeV} \leq m_{\Upsilon_D} \leq 10~\text{GeV}$ using the full data sample collected by the $BABAR$ detector.
| Collaboration / Activity | BaBar |
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Primary author
Prof.
Gerald Eigen
(University of Bergen)
