Basics
Simple kinematics
 Relativistic kinematics and fourmomentum conservation
 Orientation with respect to an axis (the beam axis)
 Mandelstam variables
 Hadronic collisions
 Problems

Convince yourself that the equation
correctly describes boosts along the zaxis.
Hint: The energy and momentum along this axis, seen from an observer with
velocity v are given by
with

Prove that
is correct.

What would an uchannel process look like in a scetch?

Consider 2→2 processes on the parton level with incoming hadrons.

Express the partonic scattering angle (the angle between an incoming and an
outgoing particle) θ in the c.m. (laboratory) frame through the
rapidites of the two outgoing particles.

Calculate do the Mandelstam variables t and u for this process in terms of
rapidities and transverse momenta of the outgoing particles.