This is my CSB talk at the Nuclear Physics Gordon Conference.  Please 
send me your comments (horowit@indiana.edu). Compared to what I 
presented in Philly there are three changes:
(1) A factor of six increase in all cross sections from the antisym of 
the inital state.
(2) An increase in the rho-omega mixing heavy meson exchange 
contribution from a neglected term.
(3) A large increase in all pi-eta mixing contributions if a larger 
eta-nucleon coupling is used.  All previous results used a relatively 
small coupling.  
If I use g_eta-NN^2/4\pi=3.68 as used in Allena's np-d pi paper the 
plane wave cross section with gaussian deuterons and 4He, at the lower 
energy, is now up to 38 pb. This is the coherent sum of one-body plus 
sigma, omega, and rho heavy meson exchange plus rho-omega mixing.   This 
still assumes a <pi H eta> mixing element of -4200 MeV^2.  Using the 
-5900 MeV^2 of Allena's paper will increase things by another 70%. 
 Alternatively if g_etaNN^2/4pi=0.6 the plane wave total cross section 
is 9 pb.