Search for the rare decays B0s→e+e− and B0→e+e−
A search for the decays B0s→e+e−Bs0→e+e− and B0→e+e−B0→e+e− is performed using data collected with the LHCb experiment in proton-proton collisions at center-of-mass energies of 77, 88 and 13TeV13TeV, corresponding to integrated luminosities of 11, 22 and 2fb−12fb−1, respectively. No signal is observed. Assuming no contribution from B0→e+e−B0→e+e− decays, an upper limit of (B0s→e+e−)<9.4(11.2)×10−9B(Bs0→e+e−)<9.4(11.2)×10−9 is obtained at 90(95)%90(95)% confidence level. If no B0s→e+e−Bs0→e+e− contribution is assumed, a limit of (B0→e+e−)<2.5(3.0)×10−9B(B0→e+e−)<2.5(3.0)×10−9 is determined at 90(95)%90(95)% confidence level. These upper limits are more than one order of magnitude lower than the previous values.