General classification and analysis of neutron<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>β</mml:mi></mml:mrow></mml:math>-decay experiments

Gudkov, Vladimir; Greene, Geoffrey L.; Calarco, J. R.

doi:10.1103/physrevc.73.035501

Cited by 44 publications

(111 citation statements)

References 21 publications

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“…(7) is equivalent to the term labeled "b SM " employed in Refs. [38,60]. However, it should be noted that the secondclass currents f 3 and g 2 yield an additional m e /E e term which is proportional to (f 3 − λg 2 ).…”

Section: Formalism For Neutron β-Decay Observablesmentioning

confidence: 99%

Framework for maximum likelihood analysis of neutronβdecay observables to resolve the limits of theV−Alaw

Gardner

Plaster

2013

Phys. Rev. C

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We assess the ability of future neutron β decay measurements of up to O(10 −4 ) precision to falsify the standard model, particularly the V − A law, and to identify the dynamics beyond it. To do this, we employ a maximum likelihood statistical framework which incorporates both experimental and theoretical uncertainties. Using illustrative combined global fits to Monte Carlo pseudodata, we also quantify the importance of experimental measurements of the energy dependence of the angular correlation coefficients as input to such efforts, and we determine the precision to which ill-known "second-class" hadronic matrix elements must be determined in order to exact such tests.

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Section: Formalism For Neutron β-Decay Observablesmentioning

confidence: 99%

Framework for maximum likelihood analysis of neutronβdecay observables to resolve the limits of theV−Alaw

Gardner

Plaster

2013

Phys. Rev. C

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“…On the other hand, in order to have a precise determination of the SM contributions one has, again, to take into account higher order terms in the momentum transfer expansion, like weak-magnetism, as well as other sub-leading corrections like electromagnetic effects [12,13,18,19].…”

Section: Nucleon-level Effective Couplingsmentioning

confidence: 99%

Prospects for precision measurements in nuclear decay in the LHC era

2013

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Precision measurements in nuclear β decay offer a sensitive window to search for new physics beyond the standard electroweak model. Searches for new physics are also a strong motivation for experiments carried out at the high energy frontier. It is instructive to confront results from the low energy and the high energy frontiers in order to look for possible complementarities. This paper reviews the constraints on new physics obtained from nuclear and neutron decays and compares them to those from other semi-leptonic processes and from the LHC. The sensitivity requirements of new precision experiments in β decay, to impact the search for new physics at the light of current and projected LHC results, are updated. Experimental developments in nuclear and neutron β decay are discussed with emphasis on their projected goals to improve the limits on exotic weak couplings.

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“…We assume here that the BSM scalar and tensor couplings make negligible contributions to the radiative and recoil-order corrections. For BSM couplings at the ≈ 0.01 level, this should certainly be true, as can be seen by inspecting radiative corrections, which are precisely defined in references [13][14][15]. Eq.…”

Section: B Dependence Of λmentioning

confidence: 99%

Limits on tensor coupling from neutronβdecay

2013

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Limits on the tensor couplings generating a Fierz interference term, b, in mixed Gamow-Teller Fermi decays can be derived by combining data from measurements of angular correlation parameters in neutron decay, the neutron lifetime, and GV = GFV ud as extracted from measurements of the Ft values from the 0 + → 0 + superallowed decays dataset. These limits are derived by comparing the neutron β-decay rate as predicted in the standard model with the measured decay rate while allowing for the existence of beyond the standard model couplings. We analyze limits derived from the electron-neutrino asymmetry, a, or the beta-asymmetry, A, finding that the most stringent limits for CT/CA under the assumption of no right-handed currents is −0.0026 < CT/CA < 0.0024 (95% C.L.) for the two most recent values of A.

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General classification and analysis of neutronβ-decay experiments

Cited by 44 publications

References 21 publications

Framework for maximum likelihood analysis of neutronβdecay observables to resolve the limits of theV−Alaw

Framework for maximum likelihood analysis of neutronβdecay observables to resolve the limits of theV−Alaw

Prospects for precision measurements in nuclear decay in the LHC era

Limits on tensor coupling from neutronβdecay

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