nLab Regge trajectory

Contents

matter field fermions (spinors, Dirac fields)

flavors of fundamental fermions in the standard model of particle physics:
generation of fermions	1st generation	2nd generation	3d generation
quarks ( $q$ )
up-type	up quark ( $u$ )	charm quark ( $c$ )	top quark ( $t$ )
down-type	down quark ( $d$ )	strange quark ( $s$ )	bottom quark ( $b$ )
leptons
charged	electron	muon	tauon
neutral	electron neutrino	muon neutrino	tau neutrino

bound states:
mesons	light mesons: pion ( $u d$ ) ρ-meson ( $u d$ ) ω-meson ( $u d$ ) f1-meson a1-meson	strange-mesons: ϕ-meson ( $s \bar s$ ), kaon, K-meson ( $u s$ , $d s$ ) eta-meson ( $u u + d d + s s$ ) charmed heavy mesons*: D-meson ( $u c$ , $d c$ , $s c$ ) J/ψ-meson ( $c \bar c$ )	bottom heavy mesons: B-meson ( $q b$ ) ϒ-meson ( $b \bar b$ )
baryons	nucleons: proton $(u u d)$ neutron $(u d d)$

hadrons (bound states of the above quarks)

bosinos:

dark matter candidates

Exotica

auxiliary fields

Idea

In physics, specifically in quantum hadrodynamics and in string theory, a Regge trajectory is, for any given type of physical system but specifically for hadrons and for strings, the graph of the mass-squared as a function of total angular momentum (with all other properties held fixed).

The Regge trajectories of mesons and of hadrons are observed to have essentially the same slope.

This phenomenon is explained by hadron supersymmetry.

E. Klempt, B. C. Metsch, Multiplet classification of light-quark baryons, Eur. Phys. J. A 48, 127 (2012) (doi:10.1140/epja/i2012-12127-1)