nLab baryon-lepton symmetry

Contents

Context

Fields and quanta

fields and particles in particle physics

and in the standard model of particle physics:

force field gauge bosons

scalar bosons

matter field fermions (spinors, Dirac fields)

flavors of fundamental fermions in the
standard model of particle physics:
generation of fermions1st generation2nd generation3d generation
quarks (qq)
up-typeup quark (uu)charm quark (cc)top quark (tt)
down-typedown quark (dd)strange quark (ss)bottom quark (bb)
leptons
chargedelectronmuontauon
neutralelectron neutrinomuon neutrinotau neutrino
bound states:
mesonslight mesons:
pion (udu d)
ρ-meson (udu d)
ω-meson (udu d)
f1-meson
a1-meson
strange-mesons:
ϕ-meson (ss¯s \bar s),
kaon, K*-meson (usu s, dsd s)
eta-meson (uu+dd+ssu u + d d + s s)

charmed heavy mesons:
D-meson (uc u c, dcd c, scs c)
J/ψ-meson (cc¯c \bar c)
bottom heavy mesons:
B-meson (qbq b)
ϒ-meson (bb¯b \bar b)
baryonsnucleons:
proton (uud)(u u d)
neutron (udd)(u d d)

(also: antiparticles)

effective particles

hadrons (bound states of the above quarks)

solitons

in grand unified theory

minimally extended supersymmetric standard model

superpartners

bosinos:

sfermions:

dark matter candidates

Exotica

auxiliary fields

Contents

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.

References

The original article:

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 13:08:22. See the history of this page for a list of all contributions to it.