Chiral EFT derivation of the Δ⁻ → p e⁻ e⁻ amplitude including long-range neutrino loops, short-range counterterms, pion-mass dependence for collinear electrons, and a long-range prediction in the degenerate Δ-nucleon mass limit.
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FeynCalc 9.3 adds improved interoperability, UV divergence extraction, Majorana fermion support, and explicit Dirac index handling to the existing symbolic QFT package.
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Neutrinoless double-beta decay of the $\Delta^-$ resonance
Chiral EFT derivation of the Δ⁻ → p e⁻ e⁻ amplitude including long-range neutrino loops, short-range counterterms, pion-mass dependence for collinear electrons, and a long-range prediction in the degenerate Δ-nucleon mass limit.
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FeynCalc 9.3: New features and improvements
FeynCalc 9.3 adds improved interoperability, UV divergence extraction, Majorana fermion support, and explicit Dirac index handling to the existing symbolic QFT package.