class PChannelModel: public PDistribution

 Constructor for coupled-channel calculations
 The PChannelModel must be correlated to a key in the PDataBase
 If "key" < 0, we try to figure out the key by parsing the descriptor

Samples the masses of the known decay products (or single particle)
Order of particles is the same as in data base

Get the weight for the masses of the known decay products
(or single particle)
Decay: Order of particles is the same as in data base,
mass[0] is the parent mass
Single particle: Use only mass[0]

Get the amplitude for the masses of the known decay products
(or single particle)
Decay: Order of particles is the same as in data base,
mass[0] is the parent mass
Single particle: Use only mass[0]

Calculates the mass-dependent width (either partial for the decay or
total for the particles)
If didx is set, use the partial width for a particular target channel

Calculates the mass-dependent br
This method is meaningless for particles
the totalwidth may be set by the user, otherwise we use the static one

By default don't care

wrapper for models with single variable only

wrapper for models with 2 variables only

TF1 wrapper