Problem with dimensionless quantities in an equation requiring M^2 (Super Hamiltonian Formulation for Geodesic Motion)

[TerryW]

I actually feel that you’ve helped me a great deal with this problem and the exchange has improved my understanding of what parameterisation is all about and that $\frac{d}{d\lambda}$ is something more abstract than classical momentum.
So you’ve most certainly helped me more than you think you have!
Regards

TerryW