Difference between revisions of "Limit of Energy in Lab Frame"

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<center><math>={\mathbf P_1^{*2}}+ {\mathbf P_1^{'*2}}-2 {\mathbf P_1^*} {\mathbf P_1^{'*}}</math></center>
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<center><math>{\mathbf P_1^{*2}}+ {\mathbf P_1^{'*2}}-2 {\mathbf P_1^*} {\mathbf P_1^{'*}}={\mathbf P_2^{*2}}+ {\mathbf P_2^{'*2}}-2 {\mathbf P_2^*} {\mathbf P_2^{'*}}</math></center>
  
  
<center><math>=2m^2-2E_1^*E_1^{'*}+2 \vec p_1^*  \vec p_1^{'*}=2m^2-2E_2^*E_2^{'*}+2 p_2^*  p_2^{'*}</math></center>
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<center><math>2m^2-2E_1^*E_1^{'*}+2 \vec p_1^*  \vec p_1^{'*}=2m^2-2E_2^*E_2^{'*}+2 p_2^*  p_2^{'*}</math></center>
  
  

Revision as of 15:17, 15 March 2018

The t quantity is known as the square of the 4-momentum transfer

[math]t \equiv \left({\mathbf P_1^*}- {\mathbf P_1^{'*}}\right)^2=\left({\mathbf P_2^{*}}- {\mathbf P_2^{'*}}\right)^2[/math]

In the CM Frame

[math]{\mathbf P_1^{*}}=-{\mathbf P_2^{*}}[/math]


[math]{\mathbf P_1^{'*}}=-{\mathbf P_2^{'*}}[/math]


[math]E_1^{*}=E_1^{'*}=E_2^{*}=E_2^{'*}[/math]


[math]\left | \vec p_1^* \right |=\left | \vec p_1^{'*} \right |=\left | \vec p_2^* \right |=\left | \vec p_2^{'*} \right |[/math]


[math]t =\left({\mathbf P_1^*}- {\mathbf P_1^{'*}}\right)^2=\left({\mathbf P_2^{*}}- {\mathbf P_2^{'*}}\right)^2[/math]


[math]{\mathbf P_1^{*2}}+ {\mathbf P_1^{'*2}}-2 {\mathbf P_1^*} {\mathbf P_1^{'*}}={\mathbf P_2^{*2}}+ {\mathbf P_2^{'*2}}-2 {\mathbf P_2^*} {\mathbf P_2^{'*}}[/math]


[math]2m^2-2E_1^*E_1^{'*}+2 \vec p_1^* \vec p_1^{'*}=2m^2-2E_2^*E_2^{'*}+2 p_2^* p_2^{'*}[/math]


In the Lab Frame

[math]{\mathbf P_1^{2}}+ {\mathbf P_1^{'2}}-2 {\mathbf P_1} {\mathbf P_1^{'}}[/math]



[math]=2m^2-2E_1E_1^'+2 p_1 p_1^'=2m^2-2E_2E_2^'+2 p_2 p_2^'[/math]


with [math]p_2=0[/math]

and [math]E_2=m[/math]

[math]t=2m^2-2mE_2^'=2(m^2-E_2^'m)[/math]


[math]\textbf{\underline{Navigation}}[/math]

[math]\vartriangleleft [/math] [math]\triangle [/math] [math]\vartriangleright [/math]