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      Resonant production of dark photons in positron beam dump experiments


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          Positrons beam dump experiments have unique features to search for very narrow resonances coupled superweakly to \(e^+ e^-\) pairs. Due to the continue loss of energy from soft photon bremsstrahlung, in the first few radiation lengths of the dump a positron beam can continuously scan for resonant production of new resonances via \(e^+\) annihilation off an atomic \(e^-\) in the target. In the case of a dark photon \(A'\) kinetically mixed with the photon, this production mode is of first order in the electromagnetic coupling \(\alpha\), and thus parametrically enhanced with respect to the \(O(\alpha^2)\) \(e^+e^- \to \gamma A'\) production mode and to the \(O(\alpha^3)\) \(A'\) bremsstrahlung in \(e^--\)nucleon scattering so far considered. If the lifetime is sufficiently long to allow the \(A'\) to exit the dump, \(A' \to e^+e^-\) decays could be easily detected and distinguished from backgrounds. We explore the foreseeable sensitivity of the Frascati PADME experiment in searching with this technique for the \(17\,\)MeV dark photon invoked to explain the \(^8\)Be anomaly in nuclear transitions.

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          Proposal to search for a dark photon in \(e^+\) on target collisions at DA\(\Phi\)NE linac

          Photon-like particles are predicted in many extensions of the Standard Model. They have interactions similar to the photon, are vector bosons, and can be produced together with photons. The present paper proposes a search for such particles in the \( e^+e^- \to U\gamma\) process in a positron-on-target experiment, exploiting the positron beam of the DA\(\Phi\)NE linac at the Laboratori Nazionali di Frascati, INFN. In one year of running a sensitivity in the relative interaction strength down to \(\sim10^{-6}\) is achievable, in the mass region from 2.5 MeV\(

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            13 February 2018


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            10 pages, 4 figures


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