The weak neutral current

Erler, Jens; Su, Shufang

doi:10.1016/j.ppnp.2013.03.004

Cited by 117 publications

(104 citation statements)

References 194 publications

(246 reference statements)

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“…eq. (3.12): where the numerical constants are due to radiative corrections in the M S scheme [32], N and Z are the number of neutrons and protons of the isotope, respectively, and the effective electron-proton, and electron-neutron couplings are given by The experimental measurement of Q Z,N W with the highest precision has been achieved with 133 Cs [33]. We display the SM and MUV prediction, and the measurement of Q…”

Section: Parity Non-conservation In Cesiummentioning

confidence: 99%

Non-unitarity of the leptonic mixing matrix: present bounds and future sensitivities

Antusch

Fischer

2014

J. High Energ. Phys.

259

307

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Abstract:The non-unitarity of the effective leptonic mixing matrix at low energies is a generic signal of extensions of the Standard Model (SM) with extra fermionic singlet particles, i.e. "sterile" or "right-handed" neutrinos, to account for the observed neutrino masses. The low energy effects of such extensions can be described in a model-independent way by the Minimal Unitarity Violation (MUV) scheme, an effective field theory extension of the SM. We perform a global fit of the MUV scheme parameters to the present experimental data, which yields the up-to-date constraints on leptonic non-unitarity. Furthermore, we investigate the sensitivities and discovery prospects of future experiments. In particular, FCC-ee/TLEP would be a powerful probe of flavour-conserving non-unitarity for singlet masses up to ∼ 60 TeV. Regarding flavour-violating non-unitarity, future experiments on muon-to-electron conversion in nuclei could even probe extensions with singlet masses up to ∼ 0.3 PeV.

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Section: Parity Non-conservation In Cesiummentioning

confidence: 99%

Non-unitarity of the leptonic mixing matrix: present bounds and future sensitivities

Antusch

Fischer

2014

J. High Energ. Phys.

259

307

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“…For the initial results presented here, only Møller polarimeter data were available. [18], Tevatron [19,20]) at or near the Z-pole, the SLAC E158 electronelectron parity violation experiment [21], the Colorado atomic parity violation (APV) experiment on 133 Cs [22,23], NuTeV [24] (this latter is controversial, we show the value from [2]), and the present result; the inset shows the anticipated final precision of our experiment.…”

Section: Methodsmentioning

confidence: 71%

“…via loop corrections or the exchange of new particles. One such example is the weak charge of the proton, which can be accessed in neutral-current processes such as parity-violating electron scattering (PVES) [1,2].…”

Section: Introductionmentioning

confidence: 99%

First result from Q_weak

Armstrong

2014

EPJ Web of Conferences

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Abstract.Initial results are presented from the recently-completed Q weak experiment at Jefferson Lab. The goal is a precise measurement of the proton's weak charge Q p w , to yield a test of the standard model and to search for evidence of new physics. The weak charge is extracted from the parity-violating asymmetry in elastic ep scattering at low momentum transfer, Q 2 = 0.025 GeV 2 . A 180 A longitudinally-polarized 1.16 GeV electron beam was scattered from a 35 cm long liquid hydrogen at small angles, 6 • < < 12 • . Scattered electrons were analyzed in a toroidal magnetic field and detected using an array of eight Cerenkov detectors arranged symmetrically about the beam axis. The initial result, from 4% of the complete data set, is Q p W = 0.064 ± 0.012, in excellent agreement with the standard model expectation. Full analysis of the data is expected to yield a value for the weak charge to about 5% precision.

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“…Note that we are using the notation introduced in Reference (9). More familiar are the so-called weak charges, Q W , which at the tree level are also given by the coherent sum of the corresponding quark couplings (as in Equation 5), but multiplied by a factor of −2 and with a different set of radiative corrections applied.…”

Section: Electroweak Physicsmentioning

confidence: 99%

“…References (33,34,35,36), the SM expressions for the NC couplings defined in this way (9) are given by,…”

Section: Radiative Correctionsmentioning

confidence: 99%

Weak Polarized Electron Scattering

Erler

Horowitz

Mantry

et al. 2014

Annu. Rev. Nucl. Part. Sci.

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Scattering polarized electrons provides an important probe of the weak interactions. Precisely measuring the parity-violating left-right cross section asymmetry is the goal of a number of experiments recently completed or in progress. The experiments are challenging, since ALR is small, typically between 10 −4 and 10 −8 . By carefully choosing appropriate targets and kinematics, various pieces of the weak Lagrangian can be isolated, providing a search for physics beyond the Standard Model. For other choices, unique features of the strong interaction are studied, including the radius of the neutron density in heavy nuclei, charge symmetry violation, and higher twist terms. This article reviews the theory behind the experiments, as well as the general techniques used in the experimental program.

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The weak neutral current

Cited by 117 publications

References 194 publications

Non-unitarity of the leptonic mixing matrix: present bounds and future sensitivities

Non-unitarity of the leptonic mixing matrix: present bounds and future sensitivities

First result from Q_weak

Weak Polarized Electron Scattering

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The weak neutral current

Cited by 117 publications

References 194 publications

Non-unitarity of the leptonic mixing matrix: present bounds and future sensitivities

Non-unitarity of the leptonic mixing matrix: present bounds and future sensitivities

First result from Qweak

Weak Polarized Electron Scattering

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First result from Q_weak