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arXiv · 2607.00136

The left-cut for partial waves in terms of physical amplitudes

Alexandre Salas-Bernárdez
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Abstract

We derive a novel representation of the partial wave amplitude over the left-hand cut for $2 \to 2$ scattering. We express the left-hand cut of arbitrary isospin and angular momentum partial waves as an integral of right-hand cut imaginary parts. This formulation provides an explicit, exact extraction of the logarithmic branch cut structures, offering a valuable tool to systematically quantify left-hand cut uncertainties in unitarization methods such as the Inverse Amplitude Method or $N/D$ approaches.

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Alexandre Salas-Bernárdez. 2026-06-30. The left-cut for partial waves in terms of physical amplitudes. https://arxiv.org/abs/2607.00136

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