The trace anomaly cancels in A_π(Q²) but dominates the TJJ contribution to the pion trace form factor in a Sudakov-improved QCD factorization calculation matched to lattice data.
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The Pion Gravitational Form Factors and the Trace Anomaly in QCD Factorization
The trace anomaly cancels in A_π(Q²) but dominates the TJJ contribution to the pion trace form factor in a Sudakov-improved QCD factorization calculation matched to lattice data.