Dark Photon Search in the Mass Range Between 1.5 and 3.4 GeV/$c^2$

M. Ablikim, M. N. Achasov, X. C. Ai +414

Using a data set of 2.93 fb${}^{-1}$ taken at a center-of-mass energy $\sqrt{s}$ = 3.773 GeV with the BESIII detector at the BEPCII collider, we perform a search for an extra U(1) ga…