On-shell reduction of spin-zero Duffin-Kemmer-Petiau covariants and implications for the relativistic impulse approximation

Luis B. Castro

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arXiv · 2610.37263

On-shell reduction of spin-zero Duffin-Kemmer-Petiau covariants and implications for the relativistic impulse approximation

Luis B. Castro

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Abstract

We analyze the on-shell content of the local Lorentz covariants of the five-dimensional spin-zero Duffin-Kemmer-Petiau algebra in elastic spin-zero-spin-$1/2$ scattering. The scalar, vector, and tensor structures are reduced explicitly to the two independent amplitudes allowed by the physical parity-conserving process. The two scalar structures are proportional on shell, the genuine nonminimal vector $i[P,β^μ]$ is longitudinal and vanishes after contraction with the conserved fermion vector current, and the projected vectors $Pβ^μ$ and $β^μP$ each reduce to one half of the minimal-vector contribution. The tensor covariants introduce no additional on-shell directions. We discuss the consequences for the four invariant choices used in meson-nucleus optical-potential calculations and show that different nuclear equations can arise only after on-shell-equivalent representatives are promoted to optical operators and iterated beyond the order at which the elementary impulse approximation is fixed. These results provide a systematic basis for distinguishing genuinely independent elementary amplitudes from representation-dependent effects generated by the optical embedding.

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Luis B. Castro. 2026-10-27. On-shell reduction of spin-zero Duffin-Kemmer-Petiau covariants and implications for the relativistic impulse approximation. https://arxiv.org/abs/2610.37263

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