Abstract
Currently, the existence of a dark sector almost completely decoupled from the Standard Model is a viable solution for numerous long-standing problems in physics, including the nature of dark matter and the muon anomalous magnetic moment. A new gauge mediator, the dark photon, could be the portal to this hidden sector. The most general probe to its existence is the missing mass technique which requires a precise knowledge of the initial state of the process but does not put constraints on the dark photon final states. The experimental approaches to the search for dark photons in positron-on-target annihilation and in mesons decay in flight are presented and the physics reach is discussed.
Highlights
Despite its great success, the Standard Model of particle physics does not provide a viable explanation for several astrophysics phenomena, including the matter-antimatter asymmetry in the Universe and the existence and the abundance of Dark matter
Its plans are to collect more than O(1013) kaon decays in the fiducial region which will allow a sensitive study of invisible Dark photon, probing leptophobic scenarios
The only experiment searching for new light particles with positron-on-target technique is PADME
Summary
The Standard Model of particle physics does not provide a viable explanation for several astrophysics phenomena, including the matter-antimatter asymmetry in the Universe and the existence and the abundance of Dark matter. There are few experimental signatures in tension with the Standard Model (SM) predictions - the measured anomalous magnetic moment of the muon (gμ − 2) [1] and the indications for the possible existence of a new light neutral boson in the deexcitation of 8Be∗ [2]. The connection between the two sectors, the Standard Model and the hidden one, is realized through a portal - one or limited number of particles that interact with states from both the visible and the hidden sector. One of the simplest possible realization of the vector portal [3], [4] is the introduction of a vector gauge field, the so-called Dark photon (DP) A , which interacts weakly with the SM fermions. If χ is light and mA > 2mχ the dominant decay process will be A → χχ since it is not suppressed by the small factor
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