Källén function

From Particle Wiki
Revision as of 16:26, 29 November 2016 by Stefan (Talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

The (triangle) Källén function appears in kinematic equations and is defined as

\lambda(x,y,z) \equiv x^2 + y^2 + z^2 - 2xy - 2yz - 2zx.

It is named after Gunnar Källén.