Difference between revisions of "DV RunGroupC Moller"

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[[File:ElectronMomentumLabFrame.jpg]][[File:MollerMomentumLabFrame.jpg]]
 
[[File:ElectronMomentumLabFrame.jpg]][[File:MollerMomentumLabFrame.jpg]]
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In the collision of two particles of mass m1 and m2, the total energy in the center of mass frame can be written
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<math>Ecm=[E1+E2)^2-(p1+p2)^2]^1/2</math>
  
 
[[File:FinalMomCM.jpg]][[File:MollerMomCM.jpg]]
 
[[File:FinalMomCM.jpg]][[File:MollerMomCM.jpg]]

Revision as of 20:45, 23 April 2015

Simulating the Moller scattering background for EG1

Step 1

Determine the Moller background using an LH2 target to check the physics in GEANT4

Incident electron energy varies from 1-11 GeV.

LH2 target is a cylinder with a 1.5 cm diameter and 1 cm thickness.

  (Following dimensions listed on page 8 of File:PHY02-33.pdf)

Numbers Moller electrons per incident electron.

  While 2nd and 3rd generations are created, only 2 2nd generation daughter particles are created for 1E6 incident particles.  All knock on electrons are not counted.

Momentum and angular distributions. 11GeV

ElectronMomentumLabFrame.jpgMollerMomentumLabFrame.jpg

In the collision of two particles of mass m1 and m2, the total energy in the center of mass frame can be written [math]Ecm=[E1+E2)^2-(p1+p2)^2]^1/2[/math]

FinalMomCM.jpgMollerMomCM.jpg

FinalTheta.jpgMollerTheta.jpg

FinalThetaCM.jpgMollerThetaCM.jpg

Comparing experimental vs. theoretical for Møller differential cross section 11GeV

FinalThetaCM.jpgV3.jpg

Step 2

Replace the LH2 target with an NH3 target and compare with LH2 target.


Step 3

Determine impact of Solenoid magnet on Moller events

Papers used

A polarized target for the CLAS detectorFile:PHY02-33.pdf

An investigation of the spin structure of the proton in deep inelastic scattering of polarized muons on polarized protons File:1819.pdf

EG12