Right-handed neutrino production rate at T > 160 GeV

Ghisoiu, Ioan; Laine, Mikko Sakari (2014). Right-handed neutrino production rate at T > 160 GeV. Journal of cosmology and astroparticle physics, 2014(12), 032-032. Institute of Physics Publishing IOP 10.1088/1475-7516/2014/12/032

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The production rate of right-handed neutrinos from a Standard Model plasma at a temperature above a hundred GeV has previously been evaluated up to NLO in Standard Model couplings (g ~ 2/3) in relativistic (M ~ πT) and non-relativistic regimes (M ≫ πT), and up to LO in an ultrarelativistic regime (M ≲ gT). The last result necessitates an all-orders resummation of the loop expansion, accounting for multiple soft scatterings of the nearly light-like particles participating in 1↔2 reactions. In this paper we suggest how the regimes can be interpolated into a result applicable for any right-handed neutrino mass and at all temperatures above 160GeV. The results can also be used for determining the lepton number washout rate in models containing right-handed neutrinos. Numerical results are given in a tabulated form permitting for their incorporation into leptogenesis codes. We note that due to effects from soft Higgs bosons there is a narrow intermediate regime around M ~g 1/2 T in which our interpolation is phenomenological and a more precise study would be welcome.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Ghisoiu, Ioan and Laine, Mikko Sakari

Subjects:

500 Science > 530 Physics

ISSN:

1475-7516

Publisher:

Institute of Physics Publishing IOP

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

09 Jan 2015 09:57

Last Modified:

26 Jun 2016 01:57

Publisher DOI:

10.1088/1475-7516/2014/12/032

ArXiv ID:

1411.1765

BORIS DOI:

10.7892/boris.61517

URI:

https://boris.unibe.ch/id/eprint/61517

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