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Forum: Particles
Re: Question Polarization of protons (Eleni Petrakou)
Date: 05 Feb, 2016
From: Gumplinger Peter <Gumplinger Peter>

Hi Eleni,

> I wouldn't expect any spin kinematics to change in the current implementation of hadron processes (or do they?).

No.

> But I'd expect that at least EM scatterings will change the proton's 
> spin vector.

No, I don't think G4 standard EM scattering changes the spin vector either.

> Moreover, I generate protons with polarization (0,1,0) and when I do the following as a test, 
> postStepPoint->AddPolarization(G4ThreeVector(0.01,0.,0.)) , 
> I see the addition taking place only at exactly the second step of the trajectory. 

The user must not change any properties of the G4Track and G4Step from the SteppingAction directly. It would take a while for me research and explain why you see the action working only at exactly the second step when it should never work.

Best regards, Peter

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1 None: Re: Polarization of protons   (Eleni Petrakou - 10 Feb, 2016)
(_ Feedback: Re: Polarization of protons   (Gumplinger Peter - 11 Feb, 2016)
(_ None: Re: Polarization of protons   (Eleni Petrakou - 12 Feb, 2016)
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