The annihilation process with massive neutrinos in cosmology

Crewther, R. J.; Finjord, J.; Minkowski, Peter

doi:10.1016/0550-3213(82)90165-1

Cited by 22 publications

(17 citation statements)

References 23 publications

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“…These results may be directly inferred from the analytical expressions given in the body of the paper, and from a glance at the figures. In this appendix we compare the cross section for annihilation in two photons in scenario 2 to the annihilation of Dirac SM neutrinos calculated by Crewther et al [42]. In [42], they effectively made use of the following Lagrangian:…”

Section: Discussionmentioning

confidence: 99%

Bremsstrahlung and gamma ray lines in 3 scenarios of dark matter annihilation

Giacchino

Lopez-Honorez

Tytgat

2014

J. Cosmol. Astropart. Phys.

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Gamma ray spectral features are of interest for indirect searches of dark matter (DM). Following Barger et al we consider 3 simple scenarios of DM that annihilates into Standard Model (SM) fermion pairs. Scenario 1 is a Majorana DM candidate coupled to a charged scalar, scenario 2 is a Majorana DM coupled to a charged gauge boson and scenario 3 is a real scalar DM coupled a charged vector-like fermion. As shown by Barger et al, these 3 scenarios share precisely the same internal Bremsstrahlung spectral signature into gamma rays. Their phenomenology is however distinct. In particular for annihilation into light SM fermions, in the chiral limit, the 2-body annihilation cross section is p-wave suppressed for the Majorana candidates while it is d-wave suppressed for the real scalar. In the present work we study the annihilation into 2 gammas, showing that these three scenarios have distinct, and so potentially distinguishable, spectral signatures into gamma rays. In the case of the real scalar candidate we provide a new calculation of the amplitude for annihilation into 2 gammas.

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Section: Discussionmentioning

confidence: 99%

Bremsstrahlung and gamma ray lines in 3 scenarios of dark matter annihilation

Giacchino

Lopez-Honorez

Tytgat

2014

J. Cosmol. Astropart. Phys.

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“…An exact expression for the amplitude of the process γγ → ν ν with massive neutrinos and on-shell photons was obtained for the first time in ref. [5] (see also ref. [6]) to estimate the star energy loss due to this reaction.…”

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confidence: 99%

“…We shall illustrate the result (1) considering the high energy neutrino scattering process in the Coulombian field of a nucleus with one photon radiation. Previously [3,5,6] only astrophysical effects of the process νγ → νγ were studied. Our aim is to examine the possibility of the detection of the process in the laboratory.…”

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confidence: 99%

Compton-like interaction of massive neutrinos with virtual photons

Кузнецов

Михеев

1993

Physics Letters B

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The amplitude of a Compton-like process nu_i gamma^* -> nu_j gamma^* with virtual photons is calculated in the standard GWS theory with lepton mixing. The contribution of this process to the high energy neutrino scattering on the nucleus with single photon radiation nu N -> nu N gamma is discussed. The bremsspectrum and the total cross-section are estimated in the leading log approximation.Comment: 6 pages, LATEX, 2 PS figure

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“…(4), we identified the gauge invariant amplitude of the famous triangle diagram, where k 1 and k 2 are the photons' momenta and k runs around the loop. We may borrow the final result for ∆ 5 µνλ from, e.g., [12]. Since we are working in the soft-photon approximation, i.e., k 1 , k 2 ≪ m, the amplitude simplifies considerably and reduces to a sum of terms which are linear in k 1 and quadratic in k 2 or vice versa.…”

Section: Effective ννγγ Actionmentioning

confidence: 99%