1 Erratum to: Eur. Phys. J. C (2021) 81:112 https://doi.org/10.1140/epjc/s10052-021-08902-6

In the original article, the following equations were incorrect:

Equations 8, 9, 12, 56, 62, 66 and 68

An additional symbol “\(\times \)” had been introduced during the typesetting process.

The original article has been corrected.