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Electroweak Oblique Parameters S, T, U in the B-LSSM

Recomputes the Peskin-Takeuchi oblique parameters S, T, and U in the B-LSSM, a supersymmetric extension of the Standard Model adding a U(1) baryon-minus-lepton gauge symmetry and a heavier Z' boson. Using the pinch technique to construct gauge-invariant gauge-boson self-energies, it derives redefined, convergent S, T, U expressions, proves divergence cancellation, and constrains the model's parameter space against electroweak precision and W-mass data.