1 Erratum to: Eur. Phys. J. C (2015) 75:177 DOI 10.1140/epjc/s10052-015-3394-9

Unfortunately, the equation (3.13) of the original version of this paper contained a typo. The correct relation reads as follows

$$\begin{aligned} \lim _{l \rightarrow \infty }{h\cdot l}= & {} -\frac{1}{2}\Bigr (\frac{1}{m-2}(m\sqrt{2m(m-1)}+2m^2 \nonumber \\&-2\sqrt{\frac{2((m+2)\sqrt{m(m-1)}+m^2\sqrt{2})(m-1)^2}{\sqrt{m(m-1)}}} \nonumber \\&-4m+4) \Bigl )^{\frac{1}{2}}. \end{aligned}$$
(3.13)

Here the correct value of the power \(\frac{1}{2}\) eliminates the typo (\(-\frac{1}{2}\)) in the earlier published version of the paper. It was a typo—not a mistake: i.e. all other relations were correct.

Unfortunately the following Acknowledgments are missing in the original article: