Difference between revisions of "Differential Cross-Section"

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<center><math>-i \mathfrak{M}_{e^-e^-}=-i \left ( \frac{e^2(\mathbf p_1+\mathbf p_{1'})_{\mu}(\mathbf p_2+\mathbf p_{2'})^{\mu}}{(\mathbf p_{2'}-\mathbf p_2)^2}- \frac{e^2(\mathbf p_1+\mathbf p_{2'})_{\mu}(\mathbf p_2+\mathbf p_{1'})^{\mu}}{(\mathbf p_{1'}-\mathbf p_2)^2} \right )</math></center>
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<center><math>-i \mathfrak{M}_{e^-e^-}=-i \left ( \frac{e^2(\mathbf p_1^*+\mathbf p_{1}^{'*})_{\mu}(\mathbf p_2^*+\mathbf p_{2}^{'*})^{\mu}}{(\mathbf p_{2}^{'*}-\mathbf p_2^*)^2}- \frac{e^2(\mathbf p_1^*+\mathbf p_{2}^{'*})_{\mu}(\mathbf p_2^*+\mathbf p_{1}^{'*})^{\mu}}{(\mathbf p_{1}^{'*}-\mathbf p_2^*)^2} \right )</math></center>
  
  
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<center><math> \mathfrak{M}_{e^-e^-}= e^2\left ( \frac{\mathbf P_1 \mathbf P_2+\mathbf P_{1'} \mathbf P_{2'}+\mathbf P_{1'} \mathbf P_2+\mathbf P_1 \mathbf P_{2'}}{(\mathbf P_{2'}-\mathbf P_2)^2}- \frac{\mathbf P_1 \mathbf P_2+\mathbf P_{2'} \mathbf P_{1'}+\mathbf P_{2'} \mathbf P_2+\mathbf P_1 \mathbf P_{1'}}{(\mathbf P_{1'}-\mathbf P_2)^2} \right )</math></center>
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<center><math> \mathfrak{M}_{e^-e^-}= e^2\left ( \frac{\mathbf P_1^* \mathbf P_2^*+\mathbf P_{1}^{'*} \mathbf P_{2}^{'*}+\mathbf P_{1}^{'*} \mathbf P_2^*+\mathbf P_1^* \mathbf P_{2}^{'*}}{(\mathbf P_{2}^{'*}-\mathbf P_2^*)^2}- \frac{\mathbf P_1^* \mathbf P_2^*+\mathbf P_{2}^{'*} \mathbf P_{1}^{'*}+\mathbf P_{2}^{'*} \mathbf P_2^*+\mathbf P_1^* \mathbf P_{1}^*}{(\mathbf P_{1}^*-\mathbf P_2^*)^2} \right )</math></center>
  
  

Revision as of 15:51, 24 June 2017

[math]-i \mathfrak{M}_{e^-e^-}=-i \left ( \frac{e^2(\mathbf p_1^*+\mathbf p_{1}^{'*})_{\mu}(\mathbf p_2^*+\mathbf p_{2}^{'*})^{\mu}}{(\mathbf p_{2}^{'*}-\mathbf p_2^*)^2}- \frac{e^2(\mathbf p_1^*+\mathbf p_{2}^{'*})_{\mu}(\mathbf p_2^*+\mathbf p_{1}^{'*})^{\mu}}{(\mathbf p_{1}^{'*}-\mathbf p_2^*)^2} \right )[/math]


[math] \mathfrak{M}_{e^-e^-}= e^2\left ( \frac{\mathbf P_1^* \mathbf P_2^*+\mathbf P_{1}^{'*} \mathbf P_{2}^{'*}+\mathbf P_{1}^{'*} \mathbf P_2^*+\mathbf P_1^* \mathbf P_{2}^{'*}}{(\mathbf P_{2}^{'*}-\mathbf P_2^*)^2}- \frac{\mathbf P_1^* \mathbf P_2^*+\mathbf P_{2}^{'*} \mathbf P_{1}^{'*}+\mathbf P_{2}^{'*} \mathbf P_2^*+\mathbf P_1^* \mathbf P_{1}^*}{(\mathbf P_{1}^*-\mathbf P_2^*)^2} \right )[/math]


Using the fact that [math]\mathbf P_1^{'*} \mathbf P_2^{'*}=\mathbf P_1^*\mathbf P_2^* \quad \mathbf P_1^{'*} \mathbf P_1^{*}=\mathbf P_2^{'*}\mathbf P_2^* \quad \mathbf P_1^{*} \mathbf P_2^{'*}=\mathbf P_2^*\mathbf P_1^{'*}[/math]


[math] \mathfrak{M}_{e^-e^-}= e^2\left ( \frac{2\mathbf P_1 \mathbf P_2+2\mathbf P_{1'} \mathbf P_2}{(\mathbf P_{2'}-\mathbf P_2)^2}- \frac{2\mathbf P_1 \mathbf P_2+2\mathbf P_1 \mathbf P_{1'}}{(\mathbf P_{1'}-\mathbf P_2)^2} \right )[/math]


[math] \mathfrak{M}_{e^-e^-}= e^2\left ( \frac{ (\mathbf P_1^{*2}-2 \mathbf P_1^* \mathbf P_2^{'*}+ \mathbf P_2^{'*2})-(\mathbf P_1^{*2}+2 \mathbf P_1^* \mathbf P_2^*+ \mathbf P_2^{*2})}{t}- \frac{(\mathbf P_1^{*2}-2 \mathbf P_1^* \mathbf P_1^{'*}+ \mathbf P_1^{'*2})-( \mathbf P_1^{*2}+2 \mathbf P_1^* \mathbf P_2^*+ \mathbf P_2^{*2})}{u} \right )[/math]


[math]\mathfrak{M}_{e^-e^-}=e^2 \left (\frac{u-s}{t}+\frac{t-s}{u} \right )[/math]
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