|Message: Re: What are y and dydx in the equation of motion?||Not Logged In (login)|
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Thank you for the fast answer!
> My notes at hand are that the components of these vectors are: > [y] > 0, 1, 2: (x, y, z) in Geant4 length units (mm by default) > 3, 4, 5: (px, py, pz) in Geant4 momentum units (GeV/c) > 7: time in lab frame > Likely other components are not needed or important
Are the y(3,4,5) the momentum or momentum x speed_of_light? The code in G4EqMagElectricField.cc suggests it is the latter. Also, the derivative of the momentum with respect to the distance is not really a force.
> dyds are the derivatives of the above with respect to the distance > along the curve, (hence the name). The units (of ds) are length > in G4 units.
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