Collisional quenching of the 2S state of muonic hydrogen

We have calculated differential, total and transport cross sections for muonic hydrogen in the n = 2 state scattering from hydrogen. The metastable fraction of the 2S state that slows down below the 2P threshold without undergoing collisional quenching has been calculated as a function of the initial kinetic energy using a Monte Carlo kinetics program. Contrary to earlier estimates, the metastable fraction in the kinetic energy range of 2 − 5 eV cannot be neglected.