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arXiv · 2010.05801

Galilean-Invariant XEFT at Next-to-Leading Order

Eric Braaten·Li-Ping He·Jun Jiang
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Abstract

XEFT is a low-energy effective field theory for charm mesons and pions that provides a systematically improvable description of the $X(3872)$ resonance. To simplify calculations beyond leading order, we introduce a new formulation of XEFT with a dynamical field for a pair of charm mesons in the resonant channel. We simplify the renormalization of XEFT by introducing a new renormalization scheme that involves the subtraction of amplitudes at the complex $D^{*0} \bar D^0$ threshold. The new formulation and the new renormalization scheme are illustrated by calculating the complex pole energy of $X$ and the $D^{*0} \bar D^0$ scattering amplitude to next-to-leading order using Galilean-invariant XEFT.

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Eric Braaten, Li-Ping He, Jun Jiang. 2020-10-12. Galilean-Invariant XEFT at Next-to-Leading Order. https://doi.org/10.1103/physrevd.103.036014

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