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

Sean Benson, Adrián Casais Vidal, Xabier Cid Vidal, Albert Puig Navarro

SciPost Phys. 7, 062 (2019) · published 13 November 2019

### 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 $pp$ 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.

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