Forecasting neutrino masses from combining KATRIN and the CMB: Frequentist and Bayesian analyses - High Energy Physics - PhenomenologyReportar como inadecuado




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Abstract: We present a showcase for deriving bounds on the neutrino masses fromlaboratory experiments and cosmological observations. We compare thefrequentist and Bayesian bounds on the effective electron neutrino mass m betawhich the KATRIN neutrino mass experiment is expected to obtain, using both ananalytical likelihood function and Monte Carlo simulations of KATRIN. Assuminga uniform prior in m beta, we find that a null result yields an upper bound ofabout 0.17 eV at 90% confidence in the Bayesian analysis, to be compared withthe frequentist KATRIN reference value of 0.20 eV. This is a significantdifference when judged relative to the systematic and statistical uncertaintiesof the experiment. On the other hand, an input m beta=0.35 eV, which is theKATRIN 5sigma detection threshold, would be detected at virtually the samelevel. Finally, we combine the simulated KATRIN results with cosmological datain the form of present post-WMAP and future simulated Planck observations.If an input of m beta=0.2 eV is assumed in our simulations, KATRIN aloneexcludes a zero neutrino mass at 2.2sigma. Adding Planck data increases theprobability of detection to a median 2.7sigma. The analysis highlights theimportance of combining cosmological and laboratory data on an equal footing.



Autor: Ole Host, Ofer Lahav, Filipe B. Abdalla, Klaus Eitel

Fuente: https://arxiv.org/







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