In order to investigate a discrepancy between existing literature valu
es for the normalization constant in the asymptotic form of three-body
wave functions for (dt mu)(+), we report the results of a new calcula
tion of the normalization constants for this system as well as the rel
ated system (dd mu)(+). These were obtained by fitting to accurate var
iational wave functions with special care being taken to describe the
long-range behavior.