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To improve momentum resolution of
the 
reconstructed mass can be constaint to the
nominal mass
of 135 MeV/c2.
To do this we can look at best values of
,
and
cos
by minimizing
the chi-square form:
 |
(2) |
and
are measured energies of the photons and 
is the measured
opening cosine of the angle between between photons.
and
are the errors on photon energy, and 
is the error in
cos.