In a recent paper, Bashkansky and Netzer considered a one-dimensional elastic collision between a target particle of mass m and an incident particle of mass M [...]⁠. 

Sassoli de Bianchi, M. (2007). Comment on “The role of mediation in collisions and related analogs,” by E. Bashkansky and N. Netzer [Am. J. Phys. 74 (12), 1083–1087 (2006)]. Am. J. Phys. 75, p. 1166. Doi: 10.1119/1.2787019.