feynlag.pheno.kinematics

Two- and three-body phase space kinematics.

Functions

is_allowed(M_parent, m1, m2)	Whether M_parent ≥ m1 + m2, when that is decidable.
kallen(x, y, z)	The Källén triangle function λ(x,y,z) = x²+y²+z²−2xy−2yz−2zx.
two_body_momentum(M_parent, m1, m2)	Magnitude of either daughter's three-momentum in the parent rest frame.
two_body_phase_space(M_parent, m1, m2)	Two-body phase space integration factor.

Classes

ThreeBodyKinematics(M, m1, m2, m3[, names])	Dalitz kinematics of parent(M) → 1(p₁) + 2(p₂) + 3(p₃).
TwoBodyKinematics(M, m1, m2[, name1, name2])	On-shell kinematics of parent(P) → 1(p₁) + 2(p₂).
TwoToTwoKinematics(m1, m2, m3, m4[, names])	On-shell kinematics of 1(k₁) + 2(k₂) → 3(k₃) + 4(k₄).