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- W4380352212 abstract "The effective number of relativistic neutrino species is a fundamental probe of the early Universe and its measurement represents a key constraint on many scenarios beyond the Standard Model of Particle Physics. In light of this, an accurate prediction of $N_{rm eff}$ in the Standard Model is of pivotal importance. In this work, we consider the last ingredient needed to accurately calculate $N_{rm eff}^{rm SM}$: standard zero and finite temperature QED corrections to $e^+e^- leftrightarrow nubar{nu}$ interaction rates during neutrino decoupling at temperatures around $Tsim {rm MeV}$. We find that this effect leads to a reduction of $-0.0007$ in $N_{rm eff}^{rm SM}$. This NLO correction to the interaction rates, together with finite temperature QED corrections to the electromagnetic density of the plasma, and the effect of neutrino oscillations, implies that $N_{rm eff}^{rm SM} = 3.043$ with a theoretical uncertainty that is much smaller than any projected observational sensitivity." @default.
- W4380352212 created "2023-06-13" @default.
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- W4380352212 date "2023-06-08" @default.
- W4380352212 modified "2023-10-16" @default.
- W4380352212 title "Neff in the Standard Model at NLO is 3.043" @default.
- W4380352212 doi "https://doi.org/10.48550/arxiv.2306.05460" @default.
- W4380352212 hasPublicationYear "2023" @default.
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