Fig. 8: Identification of background to o-Ps → 3γ signal events. | Nature Communications

Fig. 8: Identification of background to o-Ps → 3γ signal events.

From: Discrete symmetries tested at 10−4 precision using linear polarization of photons from positronium annihilations

Fig. 8: Identification of background to o-Ps → 3γ signal events.The alternative text for this image may have been generated using AI.

θ1 and θ2 indicate two smallest relative angles between momentum vectors of photons. The superimposed black pictographs at the first plot present three different orientation of momentum vectors for events with multiple scatterings (bottom left region of each plot), p-Ps → 2γ events with a single scattering (vertical band around θ1 + θ2 = 180∘) and o-Ps → 3γ signal events (bottom right region). The red vertical line corresponds to a θ1 + θ2≥190∘ cut applied for signal selection. a Full sample of MC simulated events. b Background events within the Monte Carlo sample. c Simulated signal events.

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