A new observable to measure the top-quark mass at hadron colliders S. Alioli, P. Fernandez, J. Fuster, A. Irles, S. Moch, P. Uwer and M. Vos Eur. Phys. J. C, 73 5 (2013) 2438 Published online: 29 May 2013 DOI: 10.1140/epjc/s10052-013-2438-2