Search for a dark vector gauge boson decaying to ${\pi }^{+}{\pi }^{-}$ using $\eta \to {\pi }^{+}{\pi }^{-}\gamma$ decays

Abstract

We report a search for a dark vector gauge boson $U^{\prime }$ that couples to quarks in the decay chain $D^{\ast +}\to D^0{\pi }^{+},D^0\to K_S^0\eta ,\eta \to U^{\prime }\gamma$, $U^{\prime }\to {\pi }^{+}{\pi }^{-}$. No signal is found and we set a mass-dependent limit on the baryonic fine structure constant of $10^{-3}-10^{-2}$ in the $U^{\prime }$ mass range of 290 to 520 MeV/$c^2$. This analysis is based on a data sample of 976 fb${}^{-1}$ collected by the Belle experiment at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider.

arXiv comment6 pages, 4 figures

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