Fixed the normalization problem I had before when plotting the histograms of PhotonPT and MissingE, and then moved to do the fitting.
This is a likelihood scan plot of the GP operator based on the PhotonPT distribution
In addition:
Fix some minor errors that ocuured during the fitting process, although these errors do not affect the output results.
Perform one-dimensional and different pairs of form factors(2D) fitting for the Znvnvγ process.
Only some simple selections on photon pT and the number of final-state particles have been applied. We need to optimize it further if we want to include it in a paper.