TITLE:  The four-body system made up of hydrogen and antihydrogen at
        low energies

AUTHORS:  E.A.G. Armour, C. Chamberlain and V. Zeman

AFFILIATION:  School of Mathematical Sciences, University of Nottingham,
              Nottingham NG7 2RD, U.K.

SUMMARY:

We describe calculations that we are carrying out for hydrogen and
antihydrogen $\bar{H}$ interacting at low temperatures.  Our calculations
already go beyond the Born-Oppenheimer approximation.  It is hoped to be
able to present the results of a fully quantum mechanical treatment of
H-$\bar{H}$ scattering at the conference.