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Search for a dark vector gauge boson decaying to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>using<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>η</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:msup><…
We report a search for a dark vector gauge boson ${U}^{\ensuremath{'}}$ that couples to quarks in the decay chain ${D}^{*+}\ensuremath{\rightarrow}{D}^{0}{\ensuremath{\pi}}^{+},{D}^{0}\ensuremath{\rightarrow}{K}_{S}^{0}\ensuremath{\eta},\ensuremath{\eta}\ensuremath{\rightarrow}{U}^{\ensuremath{'}}\ensuremath{\gamma}$, ${U}^{\ensuremath{'}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$. No signal is found and we set a mass-dependent limit on the baryonic fine structure constant of ${10}^{\ensuremath{-}3}\ensuremath{-}{10}^{\ensuremath{-}2}$ in the ${U}^{\ensuremath{'}}$ mass range of 290 to $520\text{ }\mathrm{MeV}/{c}^{2}$. This …