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Keywords: new physic process,how do I begin???
Forum: Event and Track Management
Re: Question new physic process,how do I begin??? (Jose Luis)
Date: 19 Jan, 2005
From: Gumplinger Peter <Gumplinger Peter>

I found this was a good presentation at the time.

http://geant4.slac.stanford.edu/UsersWorkshop/G4Lectures/Marc/

AddingNewProcess.PPT

There have been some design changes since with the G4ParticleChange class and some method names have changed. Therefore, it's a good idea to crosscheck with current code.

Unfortunately, I couldn't find any obvious place in the G4 documentation or on:

http://geant4.slac.stanford.edu/Tips/

where 'adding a new discrete process' would be explained in lay terms.

Of course, any of the existing G4 physics processes is a good example of what needs to be done. I suggest looking at one of the simpler ones, like photon pair-production, where the primary gamma (in your case the neutrino) disappears and two secondaries (in your case the neutrino reaction products) are generated.

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