Journal of High Energy Physics Journal of High Energy Physics, Springer, 2014, 6, pp.008. ⟨10.1007/JHEP06(2014)008⟩ Journal of High Energy Physics, 2014, 6, pp.008. ⟨10.1007/JHEP06(2014)008⟩ Journal of high energy physics 2014(6), 8 (2014). doi:10.1007/JHEP06(2014)008