Invariant Mass Calculation for Pion Decay
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Invariant mass calculation: Located in detector_benchmarks/calorimeters/makeplot_pion.C
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Select events with two clusters
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M^2 = 2 * p_1 * p_2 * (1 - cos(theta))
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here p_1 = E_1 first cluster energy, p_2 = E_2 second cluster energy, and theta = angle between two photons
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@whit For angle between two photons, need to know momentum vector of two photons? or know where decay position since we know two clusters' positions.