mu- bound state effect

[Steven Clayton <smclayto@npl.uiuc.edu>]

Dear Peter,

I was just going over the paper "Muonium Decay" by
Czarnecki et al. (Phys. Rev. D 61, p. 073001), and
I see that they do quote a leading bound state effect
for mu-p of .5*alpha^2 (eq. 16 of the paper).
This is the time-dialation factor, as for muonium
except without the factor (m_e/m_mu)^2, and thus
shifts the lifetime by 27 ppm.  This effect should
be added to our "list of known rate shifts," next to
lambda_pp, etc., right?  Do you know if there is any
controversy about this leading order shift?

Thanks,
Steven