Message: primary momentum Not Logged In (login)
 Next-in-Thread Next-in-Thread
 Next-in-Forum Next-in-Forum

None primary momentum 

Forum: Particles
Date: 11 Sep, 2003
From: Ernst-Jan Buis <buis@cern.ch>

LS,

I've problems understanding the kinematics of the primary particle when I ask its info by means of a_event->GetPrimaryVertex()->GetPrimary()->Print(); I call this in a "RecordBeginOfEvent(const G4Event* a_event)" methode.

I checked for three types of beamparticle: gamma, electron 
and proton, each with a (kinetic) energy of 1000 Mev. The 
output contains the following information.
1) for the gamma:
==== PDGcode 22  Particle name gamma
 Assigned charge : 0
     Momentum ( 0, 0, 1000 )
     Polarization ( 0, 0, 0 )
     Weight : 1
<<<< End of link

total momentum seems ok

2) for the electron:
==== PDGcode 11  Particle name e-
 Assigned charge : -1
     Momentum ( 0, 0, 1000.51 )
     Polarization ( 0, 0, 0 )
     Weight : 1
<<<< End of link

Momentum = kinetic energy + electron_mass??

3) for the proton
==== PDGcode 2212  Particle name proton
 Assigned charge : 1
     Momentum ( 0, 0, 1696.04 )
     Polarization ( 0, 0, 0 )
     Weight : 1
<<<< End of link

Can someone explain me how the (total) momentum of the particle is calculated??

thanks in advance,

  Ernst-Jan

Inline Depth:
 1 1
 All All
Outline Depth:
 1 1
 2 2
 All All
Add message: (add)

1 None: Re: primary momentum   (Makoto Asai - 11 Sep, 2003)
 Add Message Add Message
to: "primary momentum"

 Subscribe Subscribe

This site runs SLAC HyperNews version 1.11-slac-98, derived from the original HyperNews


[ Geant 4 Home | Geant 4 HyperNews | Search | Request New Forum | Feedback ]