1 Erratum to: Eur. Phys. J. C (2020) 80:203 https://doi.org/10.1140/epjc/s10052-020-7745-9

This erratum concerns the corrections of Equations (49) and (52).

Equation (49) should read:

$$\begin{aligned} {\mathcal {D}}W_{\alpha i}=-2c' \cdot \left( \Delta {\widetilde{m}}^{2}_{\beta }[S^{\alpha i}]_{\beta j}{\widetilde{G}}_{j}+ \Delta {\widetilde{m}}^{2}_{j}[S^{\alpha i}]^{T}_{j\beta }{\widetilde{H}}_{\beta }\right) , \end{aligned}$$

and Eq. (52) should read:

$$\begin{aligned} {\mathcal {D}}W_{\alpha i}= & {} {\mathcal {D}}W_{\alpha i}^{(1)} - 2c'\left( \Delta \widetilde{f}'_{\beta }[S^{\alpha i}]_{\beta j}{\widetilde{G}}_{j}+ \Delta {\widetilde{m}}^{2}_{\beta }[S^{\alpha i}]_{\beta j}{\widetilde{G}}'_{j} \right. \\&\left. +\, \Delta \widetilde{g}'_{j}[S^{\alpha i}]^{T}_{j\beta }{\widetilde{H}}_{\beta }+ \Delta {\widetilde{m}}^{2}_{j}[S^{\alpha i}]^{T}_{j\beta }{\widetilde{H}}'_{\beta }\right) , \end{aligned}$$

where \([S^{AI}]_{BJ}=(\sum _{\gamma k}e^{AB\gamma }e^{IJk})\Lambda _{BJ}\).