Abstract
A manifestly relativistic-invariant Lellouch-Lüscher formalism for the decays into three identical particles with no two-to-three transitions is proposed. Similarly to [1], the formalism is based on the use of the non-relativistic effective Lagrangians. Manifest Lorentz invariance is guaranteed, as in [2], by choosing the quantization axis along the total four-momentum of the three-particle system. A systematic inclusion of the higher-order derivative couplings, as well as higher partial waves is addressed.
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Müller, F., Pang, JY., Rusetsky, A. et al. Three-particle Lellouch-Lüscher formalism in moving frames. J. High Energ. Phys. 2023, 214 (2023). https://doi.org/10.1007/JHEP02(2023)214
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DOI: https://doi.org/10.1007/JHEP02(2023)214