  Latest measurements suggest that the X(3872) mass lies less than 200 keV away
from the D0-Dbar0* threshold, reenforcing its interpretation as a loosely-bound
mesonic molecule. This observation implies that in processes like D0-Dbar0-pi0
production, threshold effects could disguise the actual pole position of the
X(3872). We propose a new effective field theory with D0, Dbar0 and pi0 degrees
of freedom for the X(3872), considering Galilean invariance to be an exact
symmetry. The D0* enters as a D0-pi0 p-wave resonance, allowing for a
comprehensive study of the influence of pion interactions on the X(3872) width.
We calculate relations between the mass of the X(3872), its width, and its line
shape in D0-Dbar0-pi0 production up to next-to-leading order. Our results
provide a tool for the extraction of the X(3872) pole position from the
experimental data near threshold.
