nLab baryon-lepton symmetry

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 nuclear physics, the term baryon-lepton symmetry (Gamba-Marshak-Okubo 59) refers to the observation that interactions involving the weak nuclear force are close to invariant under joint exchange of the light baryons (protons, neutrons) with the “light leptons” (electron and its neutrino), i.e. within the first generation of fermions.

The original article:

A. Gamba, Robert Marshak, S. Okubo, On a symmetry in weak interactions, PNAS June 1, 1959 45 (6) 881-885 (doi:10.1073/pnas.45.6.881)

Review:

Robert Marshak, Yukawa Meson, Sakata Model and Baryon-Lepton Symmetry Revisited, Progress of Theoretical Physics Supplement, Volume 85, May 1985, Pages 61–74 (dpi:10.1143/PTP.85.61)

Further developments:

Rabindra N. Mohapatra, From Old Symmetries to New Symmetries: Quarks, Leptons and B-L, International Journal of Modern Physics AVol. 29, No. 29, 1430066 (2014) (arXiv:1409.7557)

Last revised on May 3, 2020 at 17:08:22. See the history of this page for a list of all contributions to it.