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arXiv · 2609.04615

Percent-Level Prediction of the Deuteron Magnetic Polarizability

Rishi Cherukuri·Jiunn-Wei Chen·Xiangdong Ji
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Abstract

Working through next-to-next-to-leading order (NNLO) accuracy in pionless effective field theory, we compute the isovector magnetic-dipole contribution to the scalar deuteron magnetic polarizability. The polarizability follows from detailed balance and a dispersion integral with the two magnetic current counter-terms fixed by the thermal $np\to d\gamma$ rate. The conventional $\rho$ and $Z$ expansion schemes differ by $12.3\%$ at next-to-leading order but agree to $0.165\%$ at NNLO, resulting an apparent scheme dependence and supplying an independent convergence diagnostic. We obtain $\beta_{M0}^{(M1_v)}=0.0789\pm0.0010~\mathrm{fm}^{3}$, a $1.3\%$ uncertainty, compared with $4.9\%$ previously.

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Rishi Cherukuri, Jiunn-Wei Chen, Xiangdong Ji. 2026-09-04. Percent-Level Prediction of the Deuteron Magnetic Polarizability. https://arxiv.org/abs/2609.04615

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