Lawrence Berkeley National Laboratory

I show that the neutral pion decay in B→K(∗)π0γ, with π0→eeγ, might generate large sources of lepton flavor universality violation (LFUV) in measurements of the ratios, RK(∗): If the photons in the K(∗)eeγγ final state are reconstructed as bremsstrahlung, the recovered electron-positron invariant mass can be pushed into the 1-6 GeV2 signal region, artificially enhancing the measured B→K(∗)ee branching ratio compared to B→K(∗)μμ. I present a conservative estimate and simulation of the B→Kπ0γ LFUV background at LHCb, that together suggest this effect could reduce the recovered RK up to several percent. A reliable assessment of the size of this effect will require dedicated simulations within experimental frameworks themselves.