G v , CKM unitarity, neutron decay; WR?

Wilkinson, D.H.

doi:10.1007/bf01289601

Cited by 33 publications

(17 citation statements)

References 18 publications

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“…where G F is the Fermi constant, θ C the Cabibbo angle, ∆ R inner = 0.024 the inner radiative corrections taken from Ref. [28], and λ = 1.2694 the form factor ratio of the axial to vector coupling constant. Parameters are taken by default to their latest PDG average values [1].…”

Section: New Predicted Cross Section Per Fissionmentioning

confidence: 99%

Reactor antineutrino anomaly

et al. 2011

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Recently, new reactor antineutrino spectra have been provided for 235 U, 239 Pu, 241 Pu, and 238 U, increasing the mean flux by about 3 percent. To a good approximation, this reevaluation applies to all reactor neutrino experiments. The synthesis of published experiments at reactor-detector distances < 100 m leads to a ratio of observed event rate to predicted rate of 0.976±0.024. With our new flux evaluation, this ratio shifts to 0.943±0.023, leading to a deviation from unity at 98.6% C.L. which we call the reactor antineutrino anomaly. The compatibility of our results with the existence of a fourth non-standard neutrino state driving neutrino oscillations at short distances is discussed. The combined analysis of reactor data, gallium solar neutrino calibration experiments, and MiniBooNEν data disfavors the no-oscillation hypothesis at 99.8% C.L. The oscillation parameters are such that |∆m 2 new | > 1.5 eV 2 (95%) and sin 2 (2θnew) = 0.14 ± 0.08 (95%). Constraints on the θ13 neutrino mixing angle are revised.

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Section: New Predicted Cross Section Per Fissionmentioning

confidence: 99%

Reactor antineutrino anomaly

et al. 2011

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“…Third, possible residual effects of Z-dependent radiative corrections (see Ref. [21]) are absent in neutron beta decay. In addition, the non-leading form factors are irrelevant at this level of precision.…”

Section: Discussionmentioning

confidence: 99%

Neutron beta decay and the current determination of Vud

2001

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Measurements of neutron beta decay observables required to determine |V ud | are reaching the 0.1% accuracy. In this paper we review the calculation of the decay rate of this process, discuss its relevant uncertainties, and obtain an expression that is precise at the 10 −4 level. Our analysis clearly shows the necessity of more precise measurements of λ, the ratio of axial/vector couplings. The current situation in neutron beta decay is that one cannot yet quote a single consistent value for |V ud | from it. We also discuss the region of parameter space in the |V ud |-λ plane where new physics effects should lie, if they contribute to neutron beta decay.

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“…The reason for this can be traced to the individual contributions of R ′ , λ ′ , and V us to χ 2 of Eq. (6). In this respect, we have produced Table VII.…”

Section: (B)mentioning

confidence: 99%

Vusand neutron beta decay

Garcı́a

Sánchez‐Colón

2008

Phys. Rev. D

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We discuss the effect of the recent change of V us by three standard deviations on the standard model predictions for neutron beta decay observables. We also discuss the effect the experimental error bars of V us have on such predictions. Refined precision tests of the standard model will be made by a combined effort to improve measurements in neutron beta decay and in strangenesschanging decays. By itself the former will yield very precise measurements of V ud and make also very precise predictions for V us .

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G v , CKM unitarity, neutron decay; WR?

Cited by 33 publications

References 18 publications

Reactor antineutrino anomaly

Reactor antineutrino anomaly

Neutron beta decay and the current determination of Vud

Vusand neutron beta decay

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