# Compact Feynman rules for Majorana fermions

@article{Denner1992CompactFR, title={Compact Feynman rules for Majorana fermions}, author={Ansgar Denner and H. N. van Eck and O. Hahn and Jill Kublbeck}, journal={Physics Letters B}, year={1992}, volume={291}, pages={278-280} }

We present simple algorithmic Feynman rules for Majorana fermions. Insisting on a fermion flow through the graphs along fermion lines we only need the familiar Dirac propagator and only vertices without explicit charge-conjugation matrices; moreover, we get the correct relative signs between different interfering Feynman graphs as in the case of Dirac fermions.

#### 86 Citations

Majoranized Feynman rules

- Physics
- 2009

We point out that the compact Feynman rules for Majorana fermions proposed by Denner et al. are in fact a convention for the complex phases of (anti)spinors, valid for both Majorana and Dirac… Expand

Recursive equations for Majorana currents

- Physics
- 2009

A recursive computation of scattering amplitudes including Majorana fermions requires a consistent definition of the fermion flow, which is introduced by Denner et al. in a diagrammatic setting. A… Expand

Dirac and Majorana Feynman Rules with four-fermions

- Physics
- 2018

A compact method for amplitude calculations in theories with Dirac and Majorana effective operators is discussed. Using the renormalizable formalism of Denner et al., [1,2] for propagators, vertices… Expand

Primary Feynman rules to calculate the ∊-dimensional integrand of any 1-loop amplitude

- Physics
- 2012

A bstractWhen using dimensional regularization/reduction the ∊-dimensional numerator of the 1-loop Feynman diagrams gives rise to rational contributions. I list the set of fundamental rules that… Expand

Diagonalization of the neutralino mass matrix and boson–neutralino interaction

- Physics
- 2008

We analyze a connection between the neutralino mass sign, parity and structure of the neutralino–boson interaction. Correct calculation of spin-dependent and spin-independent contributions to… Expand

Renormalization of lepton mixing for Majorana neutrinos

- Physics
- 2005

Abstract We discuss the one-loop electroweak renormalization of the leptonic mixing matrix in the case of Majorana neutrinos, and establish its relationship with the renormalization group evolution… Expand

Renormalization of the Complex MSSM in FeynArts/FormCalc

- Physics
- 2015

Abstract The consistent renormalization of all relevant sectors of the MSSM with complex parameters (cMSSM) and the inclusion in the FeynArts / FormCalc package has recently been completed and is… Expand

Selection rules for the decay of a particle into two identical massless particles of any spin

- Physics
- 2021

The well-known Landau-Yang (LY) theorem on the decay of a neutral particle into two photons is generalized for analyzing the decay of a neutral or charged particle into two identical massless… Expand

Majorana vs pseudo-Dirac neutrinos at the ILC

- Physics
- The European Physical Journal C
- 2019

Neutrino masses could originate in seesaw models testable at colliders, with light mediators and an approximate lepton number symmetry. The minimal model of this type contains two quasi-degenerate… Expand

Photino and Gluino Production in SQED and SQCD

- Physics
- 2011

This review starts out with a brief history of the photino–gluino phenomenology. Next, it describes difficulties encountered in the construction of Feynman amplitudes when dealing with Majorana… Expand

#### References

SHOWING 1-4 OF 4 REFERENCES

Majorana Feynman rules.

- Physics, Medicine
- Physical review. D, Particles and fields
- 1988

New graphical rules which resemble those for Dirac fermions in their natural association of momentum and fermion flows are proposed that have only those signature problems normally expected for fermIONS. Expand

Feynman rules for Majorana-neutrino interactions.

- Physics, Medicine
- Physical review. D, Particles and fields
- 1992

Simple Feynman rules for Majorana neutrinos and Dirac fermions interacting with spin-1 or spin-0 bosons are presented. Several examples using these rules are given.

Leptoproduction of supersymmetric particles

- Physics
- 1983

Abstract We study the production of scalar leptons ( l ) , scalar quarks ( q ) and gluinos ( g ) in ep → ν X , and ep → e X and the associated production of q and g in ep → eX and ep → νX. We find… Expand

The Search for Supersymmetry: Probing Physics Beyond the Standard Model

- Physics
- 1985

Abstract In this paper we survey methods by which supersymmetry (or other new physics) could be observed in experiments at present and future accelerators. We review some of the motivation for… Expand