[PWGLF] corrected the calculation of invariant mass of generated delta and al…#17131
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…so added mass axis in histograms
bhattdurgesh921-sys
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July 20, 2026 10:49
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Hi @dmallick2,
In this PR, we corrected the method used to calculate the invariant mass of the generated Δ particles. Previously, the invariant mass was reconstructed from the summed four-momenta of the decay daughters, which could shift the peak from the expected resonance mass. The updated implementation now fills the generated-particle histograms directly using the generated resonance mass.
Additionally, we introduced a mass axis for the generated Δ histograms. This allows us to verify that the generated resonance mass distribution is centered at the expected PDG value and provides a useful QA check for the generated particles.