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      Study of dynamics of\({D}^{0}\to {K}^{-}{e}^{+}{\nu }_{e}\)and\({D}^{0}\to {\pi }^{-}{e}^{+}{\nu }_{e}\)decays

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      Physical Review D
      American Physical Society (APS)

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          CP-Violation in the Renormalizable Theory of Weak Interaction

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            Unitary Symmetry and Leptonic Decays

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              Is Open Access

              Big-Bang Nucleosynthesis

              A critical review is given of the current status of cosmological nucleosynthesis. In the framework of the Standard Model with 3 types of relativistic neutrinos, the baryon-to-photon ratio, \(\eta\), corresponding to the inferred primordial abundances of deuterium and helium-4 is consistent with the independent determination of \(\eta\) from observations of anisotropies in the cosmic microwave background. However the primordial abundance of lithium-7 inferred from observations is significantly below its expected value. Taking systematic uncertainties in the abundance estimates into account, there is overall concordance in the range \(\eta = (5.7-6.7)\times 10^{-10}\) at 95% CL (corresponding to a cosmological baryon density \(\Omega_B h^2 = 0.021 - 0.025\)). The D and He-4 abundances, when combined with the CMB determination of \(\eta\), provide the bound \(N_\nu=3.28 \pm 0.28\) on the effective number of neutrino species. Other constraints on new physics are discussed briefly.
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                Author and article information

                Journal
                PRVDAQ
                Physical Review D
                Phys. Rev. D
                American Physical Society (APS)
                1550-7998
                1550-2368
                October 2015
                October 22 2015
                : 92
                : 7
                Article
                10.1103/PhysRevD.92.072012
                3a4e05ad-f515-42b1-84f8-8bfd4ec5629e
                © 2015

                http://link.aps.org/licenses/aps-default-license

                http://link.aps.org/licenses/aps-default-accepted-manuscript-license

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