Towards a precision calculation of the effective number of neutrinos 𝖭_𝖾𝖿𝖿 in the Standard Model. Part II. Neutrino decoupling in the presence of flavour oscillations and finite-temperature QED
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Towards a precision calculation of the effective number of neutrinos 𝖭_𝖾𝖿𝖿 in the Standard Model. Part II. Neutrino decoupling in the presence of flavour oscillations and finite-temperature QED

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Towards a precision calculation of the effective number of neutrinos 𝖭_𝖾𝖿𝖿 in the Standard Model. Part II. Neutrino decoupling in the presence of flavour oscillations and finite-temperature QED

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dc.contributor.author Bennett, Jack J.
dc.contributor.author Buldgen, Gilles
dc.contributor.author Fernández de Salas, Pablo
dc.contributor.author Drewes, Marco
dc.contributor.author Gariazzo, Stefano
dc.contributor.author Pastor Carpi, Sergio
dc.contributor.author Wong, Yvonne Y.Y.
dc.date.accessioned 2022-05-03T14:33:42Z
dc.date.available 2022-05-03T14:33:42Z
dc.date.issued 2021
dc.identifier.uri https://hdl.handle.net/10550/82540
dc.description.abstract We present in this work a new calculation of the standard-model benchmark value for the effective number of neutrinos, Neff-SM, that quantifies the cosmological neutrino-to-photon energy densities. The calculation takes into account neutrino flavour oscillations, finite-temperature effects in the quantum electrodynamics plasma to O(e3), where e is the elementary electric charge, and a full evaluation of the neutrino-neutrino collision integral. We provide furthermore a detailed assessment of the uncertainties in the benchmark Neff-SM value, through testing the value's dependence on (i) optional approximate modelling of the weak collision integrals, (ii) measurement errors in the physical parameters of the weak sector, and (iii) numerical convergence, particularly in relation to momentum discretisation. Our new, recommended standard-model benchmark is Neff-SM = 3.0440 ± 0.0002, where the nominal uncertainty is attributed predominantly to errors incurred in the numerical solution procedure (|δNeff| ∼10^-4), augmented by measurement errors in the solar mixing angle sin^2(θ12) (|δ eff| ∼10^-4).
dc.language.iso eng
dc.relation.ispartof Journal Of Cosmology And Astroparticle Physics, 2021, vol. 04, num. 073, p. 073-1-073-31
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Bennett, Jack J. Buldgen, Gilles Fernández de Salas, Pablo Drewes, Marco Gariazzo, Stefano Pastor Carpi, Sergio Wong, Yvonne Y.Y. 2021 Towards a precision calculation of the effective number of neutrinos 𝖭_𝖾𝖿𝖿 in the Standard Model. Part II. Neutrino decoupling in the presence of flavour oscillations and finite-temperature QED Journal Of Cosmology And Astroparticle Physics 04 073 073-1 073-31
dc.subject Cosmologia
dc.subject Astrofísica
dc.title Towards a precision calculation of the effective number of neutrinos 𝖭_𝖾𝖿𝖿 in the Standard Model. Part II. Neutrino decoupling in the presence of flavour oscillations and finite-temperature QED
dc.type info:eu-repo/semantics/article
dc.date.updated 2022-05-03T14:33:42Z
dc.identifier.doi https://doi.org/10.1088/1475-7516/2021/04/073
dc.identifier.idgrec 152256

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