Real-time discrimination of photon pairs using machine learning at the LHC

Abstract

ALP-mediated decays and other as-yet unobserved B decays to di-photon final states are a challenge to select in hadron collider environments due to the large backgrounds that come directly from the p p collision. We present the strategy implemented by the LHCb experiment in 2018 to efficiently select such photon pairs. A fast neural network topology, implemented in the LHCb real-time selection framework achieves high efficiency across a mass range of 4 − 20 GeV / c 2 . We discuss implications and future prospects for the LHCb experiment.