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Article
Report number	arXiv:0907.3674 ; CERN-PH-TH-2009-127 ; MPP-2009-81 ; CERN-PH-TH-2009-127 ; MPP-2009-81
Title	Flavour-dependent radiative correction to neutrino-neutrino refraction
Author(s)	Mirizzi, Alessandro (Munich, Max Planck Inst.) ; Pozzorini, Stefano (CERN) ; Raffelt, Georg G. (Munich, Max Planck Inst.) ; Serpico, Pasquale D. (CERN)
Publication	2009
Imprint	22 Jul 2009
Number of pages	15 p, 15
Note	Comments: 15 pages, 6 figures
In:	JHEP 10 (2009) 020
DOI	10.1088/1126-6708/2009/10/020
Subject category	Particle Physics - Phenomenology
Abstract	In the framework of the Standard Model we calculate the flavour non-universal correction for neutrino refraction in a neutrino background and verify a similar previous result for the case of ordinary-matter background. The dominant term arises at loop level and involves tau leptons circulating in the loop. These O(G_F m_tau^2) corrections to the tree-level potential provide the dominant refractive difference between nu_mu and nu_tau unless the medium contains mu or tau leptons. Our results affect the flavour evolution of dense neutrino gases and may be of interest for collective three-flavour oscillations of supernova neutrinos. We spell out explicitly how these non-universal neutrino-neutrino interactions enter the flavour oscillation equations.
Copyright/License	Open Access

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