Big Bang Nucleosynthesis Constraints on Z' Properties

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dc.creatorBarger, Vernon
dc.creatorLangacker, Paul
dc.creatorLee, Hye-Sung
dc.date2004-02-04
dc.date.accessioned2026-07-07T03:51:57Z
dc.date.available2026-07-07T03:51:57Z
dc.descriptionIn models involving new TeV-scale Z' gauge bosons, the new U(1)' symmetry often prevents the generation of Majorana masses needed for a conventional neutrino seesaw, leading to three super-weakly interacting right-handed neutrinos, the Dirac partners of the ordinary neutrinos. These can be produced prior to Big Bang Nucleosynthesis (BBN) by the Z' interactions, leading to a faster expansion rate and too much ^4He. We quantify the constraints on the Z' properties from nucleosynthesis for Z' couplings motivated by a class of E6 models parametrized by an angle theta_E6. The decoupling temperature, which is higher than that of ordinary left-handed neutrinos due to the large Z' mass, is calculated, and the equivalent number of extra weakly interacting neutrinos, Delta N_nu, is obtained numerically as a function of the Z' mass, couplings, and the Z-Z' mixing angle. The ^4He abundance from BBN gives the most stringent limit on M_Z' unless Z' coupling to the right-handed neutrinos are small.
dc.descriptionTo appear in the Proceedings of SUSY 2003, held at the University of Arizona, Tucson, AZ, 5-10 June 2003
dc.identifierhttps://arxiv.org/abs/hep-ph/0402048
dc.identifierhttp://arxiv.org/abs/hep-ph/0402048
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/43290
dc.subjectHigh Energy Physics - Phenomenology
dc.titleBig Bang Nucleosynthesis Constraints on Z' Properties
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