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Question Polarization of protons  

Forum: Particles
Date: 04 Feb, 2016
From: Eleni Petrakou <Eleni Petrakou>


I am trying to follow the polarization of protons traversing an (unpolarized) carbon target, 
however this looks harder than expected. Any tip would be very appreciated. 

I wouldn't expect any spin kinematics to change in the current implementation of hadron 
processes (or do they?). But I'd expect that at least EM scatterings will change the proton's 
spin vector. However, I never see it changing no matter the kind of interaction. 

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. 

Could you please let me know if all this is expected or if it rings a bell of some omission 
in my code? 

Best regards 

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1 Feedback: Re: Polarization of protons   (Gumplinger Peter - 05 Feb, 2016)
(_ 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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