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

Abstract

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 $\sim 10^{-6}$ is achievable, in the mass region from 2.5 MeV$<M_U<$ 20 MeV. The proposed experimental setup and the analysis technique is discussed.

19 pages, 21 figures, version accepted for publication in Adv. in HEP

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