1 Erratum to: Eur. Phys. J. C (2020) 80:81 https://doi.org/10.1140/epjc/s10052-020-7611-9

The original version of this article was revised.

The following three equations were incorrectly rendered by the typesetter:

The second square bracket in equation (134)

\(\left[ \partial _\alpha \rho ^+_\beta \pi ^- +\partial _\alpha \rho ^-_\beta \pi ^+ +\left( 1+ \epsilon _3 \right) \partial _\alpha \rho ^{I}_\beta \pi ^0 \right] \)

should be modified to:

\( \left[ \partial _\alpha \rho ^+_\beta \pi ^- +\partial _\alpha \rho ^-_\beta \pi ^+ +\left( 1+ \xi _3 \right) \partial _\alpha \rho ^{I}_\beta \pi ^0 \right] \)

Note: \( \epsilon _3\) should be replaced by \(\xi _3\)

The second equation (137)  printed as:

\(\left[ \frac{\delta _A}{2} \sin {\delta _P} -\epsilon _1 \right] \)

should be read:

\(\left[ \frac{\Delta _A}{2} \sin {\delta _P} -\epsilon _1 \right] \)

Note: \(\delta _A\) should be replaced by \(\Delta _A\)

The second equation (139)  printed as:

\(\left[ \frac{\delta _A}{2} \cos {\delta _P} -\epsilon _2 \right] \)

should be read:

\(\left[ \frac{\Delta _A}{2} \cos {\delta _P} -\epsilon _2 \right] \)

Note: \(\delta _A\) should be replaced by \(\Delta _A\)

The original article has been corrected.