First observation of photons-to-taus in proton–proton collisions by CMS . Using the outstanding tracking capabilities of the CMS detector, the collaboration observed two photons producing two tau-leptons in proton–proton collisions 25 March, 2024 Recreated candidate event of a γγ →ττ process in proton–proton collisions measured by the CMS detector. The tau can decay into a muon (red), charged pions (yellow) and neutrinos (not visible); energy deposits in the electromagnetic c...