Tamar AppendixChapt - Revision history

Didbtama at 17:33, 15 June 2012

2012-06-15T17:33:12Z

Didbtama at 17:32, 15 June 2012

2012-06-15T17:32:20Z

Didbtama: Created page with ' [https://wiki.iac.isu.edu/index.php/Delta_D_over_D Back to DeltaD]'

2012-06-15T17:31:33Z

Created page with ' [https://wiki.iac.isu.edu/index.php/Delta_D_over_D Back to DeltaD]'

New page

[https://wiki.iac.isu.edu/index.php/Delta_D_over_D Back to DeltaD]

← Older revision		Revision as of 17:33, 15 June 2012
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	One of the major advantages of the double polarization experiments is the minimum contribution from the radiative corrections. For the <math>~4.2 GeV</math> incident electron beam data the radiative corrections are less than 5%<ref>http://www.jlab.org/Hall-B/secure/eg1/EG2000/fersch/QUALITY_CHECKS/file_quality/runinfo.txt</ref>. Due to negligible contributions from the radiative corrections, they are not included in the double spin asymmetry analysis.<br>		One of the major advantages of the double polarization experiments is the minimum contribution from the radiative corrections. For the <math>~4.2 GeV</math> incident electron beam data the radiative corrections are less than 5%<ref>http://www.jlab.org/Hall-B/secure/eg1/EG2000/fersch/QUALITY_CHECKS/file_quality/runinfo.txt</ref>. Due to negligible contributions from the radiative corrections, they are not included in the double spin asymmetry analysis.<br>

		+	=Notes=
		+
		+	<references/>
	[https://wiki.iac.isu.edu/index.php/Delta_D_over_D Back to DeltaD]		[https://wiki.iac.isu.edu/index.php/Delta_D_over_D Back to DeltaD]

← Older revision		Revision as of 17:32, 15 June 2012
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		+	=Radiative Corrections=
		+	In double spin asymmetry analysis the electron nucleon scattering process is given as an one photon exchange event, so called the Born approximation([https://wiki.iac.isu.edu/images/f/f2/TheBornApproximation.png Fig 2.19]). In reality, there are multiple photon effects during the experiments. These high order processes, also called radiative effects, can be calculated and used to correct the cross section data.<br>
		+	{\| border="0" style="background:transparent;" align="center"
		+	\|-
		+	\|
		+	[[File:TheBornApproximation.png\|350px\|thumb\|'''Figure 2.19.''' The Born Approximation]]
		+	\|}<br>
		+	There are two types of radiative corrections, internal and external. Internal radiative corrections describe the contributions, which took place during the lepton-hadron interaction. In first order approximation they include vertex photon exchange, self energy and vacuum polarization Fig. 2.20.<ref name="RadiativeCorrections"> Nucleon Form Factors. In Scholarpedia, from http://www.scholarpedia.org/article/Nucleon_Form_factors#History </ref><br>
		+	{\| border="2" align="center"
		+	\|-
		+	\|[[File:InetranRadiativeCor1.png\|350px\|thumb\|Vertex Photon Exchange]]\|\| [[File:InetranRadiativeCor2.png\|350px\|thumb\|Vacuum Polarization]]
		+	\|-
		+	\|[[File:InetranRadiativeCor3.png\|350px\|thumb\|Self Energy]]\|\| [[File:InetranRadiativeCor4.png\|350px\|thumb\|Self Energy]]
		+	\|}<br>
		+	{\| border="2" align="center"
		+	\|-
		+	\|'''Figure 2.20''' Internal Radiation
		+	\|}<br>
		+	On the other hand, the external radiative corrections account for the Bremsstrahlung by the incoming and scattered electron and by the recoiling target nucleon [https://wiki.iac.isu.edu/images/0/04/ExternalRadiativeCor.png Fig. 2.21].<br>

		+	{\| border="0" style="background:transparent;" align="center"
		+	\|-
		+	\|
		+	[[File:ExternalRadiativeCor.png\|350px\|thumb\|'''Figure 2.21''' Externall Radiation]]
		+	\|}<br>
		+	One of the major advantages of the double polarization experiments is the minimum contribution from the radiative corrections. For the <math>~4.2 GeV</math> incident electron beam data the radiative corrections are less than 5%<ref>http://www.jlab.org/Hall-B/secure/eg1/EG2000/fersch/QUALITY_CHECKS/file_quality/runinfo.txt</ref>. Due to negligible contributions from the radiative corrections, they are not included in the double spin asymmetry analysis.<br>

	[https://wiki.iac.isu.edu/index.php/Delta_D_over_D Back to DeltaD]		[https://wiki.iac.isu.edu/index.php/Delta_D_over_D Back to DeltaD]