Isospin-breaking corrections in the pion-deuteron scattering length

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Abstract

It is shown that isospin-breaking corrections to the pion-deuteron scattering length can be very large, because of the vanishing of the isospin-symmetric contribution to this scattering length at leading order in chiral perturbation theory. We further demonstrate that these corrections can explain the bulk of the discrepancy between the recent experimental data on pionic hydrogen and pionic deuterium. We also give the first determination of the electromagnetic low-energy constant f1. © 2006 Elsevier B.V. All rights reserved.

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Meißner, U. G., Raha, U., & Rusetsky, A. (2006). Isospin-breaking corrections in the pion-deuteron scattering length. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 639(5), 478–482. https://doi.org/10.1016/j.physletb.2006.07.001

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