Symbolic regression fits to lattice QCD and model GPDs show that the isovector GPD H_{u-d} approximately factorizes in x and t in the trained kinematic region, and a new Taylor-coefficient clustering criterion (ECC) groups the many fits into a few stable solution families.
This is no mistake as these two clusters correspond to replicas with different a5
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Generalized Parton Distributions from Symbolic Regression
Symbolic regression fits to lattice QCD and model GPDs show that the isovector GPD H_{u-d} approximately factorizes in x and t in the trained kinematic region, and a new Taylor-coefficient clustering criterion (ECC) groups the many fits into a few stable solution families.