Two Jet Kinematics
At the LHC, partons in the incoming beams (beam energy $E_b$=7 TeV) collide with a momementum fraction $x_{1,2}$ and produce two jets with negligible mass, transverse momentum $p_T$ and rapidities $y_{3,4}$.
1.
Show that $x_1 = \frac{p_T}{\sqrt{s}} ( e{y_3}+ e{y_4}), x_2 = \frac{p_T}{\sqrt{s}} ( e{-y_3}+ e{-y_4})\,. $
2.
Show that the invariant mass of the jet-jet system is
and the centre-of-mass scattering angle is given by
3.
y_{3,4} | <3$. |
4.
Use MadGraph/MadEvent to obtain the relative contribution of $gg,qg+\bar q g,qq+q\bar q$ initial states to the jet $E_T$ distribution as function of the $E_T$ $(10<E_T<E_{\rm max}/4)$ at the Tevatron Run II ($p\bar p$ collisions at 1.96 TeV) and the LHC ($pp$ collisions at 14 TeV).
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