Probing Dark Forces at GeV-scale Colliders

Since the 1980s a broad class of new physics models has postulated the existence of a light, weakly coupled neutral gauge boson (dark photon). In recent years, a wealth of astrophysical anomalies has been explained in terms of this idea, without contradicting existing particle physics data. Because these new GeV-scale bosons communicate with the Standard Model particles, they can be produced in a controlled laboratory environment and low-energy experiments with high luminosity are the prime place to look for such states. Here we focus on the process of associated production of a photon and a dark photon at GeV-scale high-luminosity e+e- colliders. We present the experimental sensitivity to a dark photon signal of current experiments like KLOE-2 at DAΦNE and at a future superB factory. Our calculation is implemented in an upgraded version of the generator BabaYagaatNLO, available for data analysis in these new physics searches. (authors)