leptonic decay



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)
neutralelectron neutrinomuon neutrinotau neutrino
bound states:
mesonslight mesons:
pion (udu d)
ρ-meson (udu d)
ω-meson (udu d)
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)
proton (uud)(u u d)
neutron (udd)(u d d)

(also: antiparticles)

effective particles

hadrons (bound states of the above quarks)


in grand unified theory

minimally extended supersymmetric standard model




dark matter candidates


auxiliary fields



In the context of quantum hadrodynamics, the decay-mode of a meson via the weak interaction (i.e. by exchange of a W-boson or Z-boson) into a pair of leptons is called (shown are Feynman diagrams of example decays of kaons):

All this is in contrast to

  • non-leptonic decays where other mesons but no leptons are produced:



  • L. G. Landsberg, Electromagnetic decays of light mesons, Physics Reports Volume 128, Issue 6, November 1985, Pages 301-376 (doi:10.1016/0370-1573(85)90129-2)

  • R. Casalbuoni, A. Deandrea, N. Di Bartolomeo, F. Feruglio, R. Gatto, G. Nardulli, Phenomenology of Heavy Meson Chiral Lagrangians, Phys. Rept. 281:145-238, 1997 (arXiv:hep-ph/9605342)

Purely leptonic decays

  • Tome Anticic, Purely leptonic decays of heavy flavor mesons 1997 (spire:454066)

Leptonic decays of pions

Discussion of leptonic decays of pions:


  • Dinko Pocanic, Emil Frlez, Andries van der Schaaf, Experimental study of rare charged pion decays, Journal of Physics G: Nuclear and Particle Physics, Volume 41, Number 11 (arXiv:1407.2865)

Purely leptonic decays

See at vector meson dominance.

Raditive leptonic decays

Discussion of radiative leptonic decays of the pion (see also at Dalitz decay)

  • Rene Unterdorfer, Hannes Pichl, On the Radiative Pion Decay, Eur. Phys. J. C55:273-283, 2008 (arXiv:0801.2482)

  • V. Bolotov, The radiative pion decays (pdf)

Leptonic decays of ω\omega-mesons

Discussion of leptonic decays of omega-mesons:

  • I. N. Mishustin, L. M. Satarov, H. Stoecker, W. Greiner, Dilepton production by bremsstrahlung of meson fields in nuclear collisions, Phys. Rev. C57:2552-2558, 1998 (arXiv:hep-ph/9709384)

  • Anastasiya Kuzmenko et al. , The Study of the Conversion Decays of Omega Meson to π 0\pi^0 Meson and e +e e^+ e^- Pair with the CMD-3 Detector, CERN Proceedings Archives Vol 1 (2017) (doi:10.23727/CERN-Proceedings-2017-001.91

Leptonic decays of B-mesons

Discussion of leptonic decays of B-mesons:


Fully leptonic decays

  • M. Lattery, Fully Leptonic Decays of B Mesons, 1996 (spire)

Semileptonic decays

  • J. P. Lees et al. (BABAR Collaboration), Measurement of the B +ω +νB^+ \to \omega \ell^+ \nu branching fraction with semileptonically tagged B mesons, Phys. Rev. D 88, 072006 (2013) (doi:10.1103/PhysRevD.88.072006)

  • Xian-Wei Kang, Tao Luo, Yi Zhang, Ling-Yun Dai, Chao Wang, Semileptonic BB and B sB_s decays involving scalar and axial-vector mesons, Eur. Phys. J. C 78, 909 (2018) (doi:10.1140/epjc/s10052-018-6385-9)

In relation to flavor anomalies

Discussion of leptonic decays in view of observed flavour anomalies:

  • N. Penalva, E. Hernández, J. Nieves, Hadron and lepton tensors in semileptonic decays including new physics (arXiv:2004.08253)

  • N. Penalva, E. Hernández, J. Nieves, B¯ cη c\bar B_c \to \eta_c, B¯ cJ/ψ\bar B_c \to J/\psi and B¯D (*)\bar B \to D^{(\ast)} semileptonic decays including new physics (arXiv:2007.12590)

Last revised on April 7, 2021 at 13:56:44. See the history of this page for a list of all contributions to it.