Search for the dark photon in ${\pi }^0$ decays by the NA48/2 experiment at CERN

Abstract

A sample of $4.687\times 10^6$ fully reconstructed $K^{\pm }\to {\pi }^{\pm }{\pi }_D^0$, ${\pi }_D^0\to \gamma e^{+}{e}^{-}$ decay candidates in the kinematic range $m_{ee}>10\mathrm{MeV}/c^2$ with a negligible background contamination collected by the NA48/2 experiment at CERN in 2003-04 is analysed to search for the dark photon ($A^{\prime }$) via the decay chain $K^{\pm }\to {\pi }^{\pm }{\pi }^0$, ${\pi }^0\to \gamma A^{\prime }$, $A^{\prime }\to e^{+}{e}^{-}$. No signal is observed, and preliminary exclusion limits on space of dark photon mass $m_A^{\prime }$ and mixing parameter ${\epsilon }^2$ are reported.

Talk given at the DHF 2014 conference, Messina, Italy, 24-26 September 2014

References in corpus (6)

• Big-Bang Nucleosynthesis
• Secluded U(1) below the weak scale
• Search for a dark photon in e+e- collisions at BABAR
• Dispersive analysis of the pion transition form factor
• Direct Detection of Multi-component Secluded WIMPs
• Search for direct CP violating charge asymmetries in $K^{\pm }\to {\pi }^{\pm }{\pi }^{+}{\pi }^{-}$ and $K^{\pm }\to {\pi }^{\pm }{\pi }^0{\pi }^0$ decays

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