Physics:Invariant cross-section
From HandWiki
The cross-section 
is called invariant because 
remains invariant under Lorentz transformations. Inclusive cross-sections are commonly given as invariant cross-sections, e.g. in terms of rapidity y and transverse momentum 
. Integrated over the azimuth, the invariant cross-section in these variables is 
. For other invariant cross-sections, 
Barnett96.
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