Neutron Dark Matter Decays and Correlation Coefficients of Neutron Beta Decays

Abstract

As we have pointed out in (arXiv:1806.10107 [hep-ph]), the existence of neutron dark matter decay modes "n -> chi + anything", where "chi" is a dark matter fermion, for the solution of the neutron lifetime problem changes priorities and demands to describe the neutron lifetime "tau_n = 888.0(2.0)s", measured in beam experiments and defined by the decay modes "n -> p + anything", in the Standard Model (SM). The latter requires the axial coupling constant "lambda" to be equal to "lambda = - 1.2690" (arXiv:1806.10107 [hep-ph]). Since such an axial coupling constant is excluded by experimental data reported by the PERKEO II and UCNA Collaborations, the neutron lifetime "tau_n = 888.0(2.0)s" can be explained only by virtue of interactions beyond the SM, namely, by the Fierz interference term of order "b ~ - 10^{-2}" dependent on scalar and tensor coupling constants. We give a complete analysis of all correlation coefficients of the neutron beta decays with polarized neutron, taking into account the contributions of scalar and tensor interactions beyond the SM with the Fierz interference term "b ~ - 10^{-2}". We show that the obtained results agree well with the contemporary experimental data that does not prevent the neutron with the rate of the decay modes "n -> p + anything", measured in beam experiments, to have dark matter decay modes "n -> chi + anything".

arXiv comment12 pages, 1 figure. arXiv admin note: text overlap with arXiv:1805.03880, arXiv:1806.10107, arXiv:1807.04604, it is accepted for publication in Nuclear Physics B

References in corpus (35)

• Shapiro delay measurement of a two solar mass neutron star
• New Constraints and Prospects for sub-GeV Dark Matter Scattering off Electrons in Xenon
• Exotic Decays of the 125 GeV Higgs Boson
• Tests of the standard electroweak model in beta decay
• Measurement of the neutron lifetime using a gravitational trap and a low-temperature Fomblin coating
• Probing Novel Scalar and Tensor Interactions from (Ultra)Cold Neutrons to the LHC
• Superallowed 0+ --> 0+ nuclear beta decays: 2014 critical survey, with precise results for Vud and CKM unitarity
• Dark Matter Interpretation of the Neutron Decay Anomaly
• Beta Decays and Non-Standard Interactions in the LHC Era
• Precision Measurements and CKM Unitarity
• Determination of the Weak Axial Vector Coupling from a Measurement of the Beta-Asymmetry Parameter A in Neutron Beta Decay
• Neutron Lifetime and Axial Coupling Connection
• Neutron stars exclude light dark baryons
• Neutron lifetime measurements using gravitationally trapped ultracold neutrons
• Precision Measurement of the Neutron Beta-Decay Asymmetry
• New result for the neutron $\beta$-asymmetry parameter $A_0$ from UCNA
• Testing dark decays of baryons in neutron stars
• Search for the Neutron Decay n$\to$ X+$\gamma$ where X is a dark matter particle
• Implications of Neutron Star Properties for the Existence of Light Dark Matter
• Dark decay of the neutron
• Neutron Beta-Decay as Laboratory for Test of Standard Model
• Sharpening Low-Energy, Standard-Model Tests via Correlation Coefficients in Neutron Beta-Decay
• Measurement of the Neutrino Asymmetry Parameter B in Neutron Decay
• Neutral Hadrons Disappearing into the Darkness
• Search for dark matter decay of the free neutron from the UCNA experiment: n $\to \chi +e^{+}{e}^{-}$
• Measurement of the Transverse Polarization of Electrons Emitted in Free Neutron Decay
• Measurement of Transverse Polarization of Electrons Emitted in Free Neutron Decay
• General classification and analysis of neutron beta-decay experiments
• Framework for maximum likelihood analysis of neutron beta decay observables to resolve the limits of the V-A law
• Precision analysis of electron energy spectrum and angular distribution of neutron beta decay with polarized neutron and electron
• Tests of the Standard Model in Neutron Beta Decay with Polarized Neutron and Electron and Unpolarized Proton
• Precision Theoretical Analysis of Neutron Radiative Beta Decay to Order "O(α^2/π^2)"
• Neutron Dark Matter Decays
• Neutron Lifetime Discrepancy as a Sign of a Dark Sector?
• Electrodisintegration of Deuteron into Dark Matter and Proton Close to Threshold

Cited by in corpus (11)

• Exotic decay channels are not the cause of the neutron lifetime anomaly
• Neutron Stars with Baryon Number Violation, Probing Dark Sectors
• Limit on the Fierz Interference Term b from a Measurement of the Beta Asymmetry in Neutron Decay
• Neutron Decay to a Non-Abelian Dark Sector
• Precision analysis of pseudoscalar interactions in neutron beta decays
• Theoretical description of the neutron beta decay in the standard model at the level of 10^{-5}
• On the structure of the correlation coefficients S(E_e) and U(E_e) of the neutron beta decay
• On the correlation coefficient T(E_e) of the neutron beta decay, caused by the correlation structure invariant under discrete P, C and T symmetries
• A New Neutron Lifetime Experiment with Cold Neutron Beam Decay in Superfluid Helium-4
• Neutron decay into a Dark Sector via Leptoquarks
• Neutron beta decay and exact conservation of charged weak hadronic vector current in the Standard Model