Precise Matter and Antimatter Tests of the Standard Model with $${\mathrm{{e}}}^{-}, {\mathrm{{e}}}^{+}, {\mathrm{{p}}}, \,\overline{\mathrm{{p}}}$$ and $$\overline{\mathrm{{H}}}$$

Gabrielse, Gerald; Hoogerheide, Shannon Fogwell; Dorr, Joshua Charles; Novitski, E.

doi:10.1007/978-3-642-45201-7_1

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Qed Tests and α Measurements1

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Cited by 3 publications

(2 citation statements)

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“…The anomalous magnetic moment a e is related to α through [41] a a exp e = 0.00115965218073 (28). (13) Plans for new, even more accurate, measurements are discussed in [42].…”

Section: Qed Tests and α Measurementsmentioning

confidence: 99%

QED and Fundamental Symmetries in Positronium Decays

Bass¹

2019

Acta Phys. Pol. B

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“…The anomalous magnetic moment a e is related to α through [41] a a exp e = 0.00115965218073 (28). (13) Plans for new, even more accurate, measurements are discussed in [42].…”

Section: Qed Tests and α Measurementsmentioning

confidence: 99%

QED and Fundamental Symmetries in Positronium Decays

Bass¹

2019

Acta Phys. Pol. B

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“…We can verify the scale of the effect of small-scale variations on the beam in two ways: first, with an analytic calculation, and second, by experimental data. For the former, ref (26) averages the product 〈P(I)∇ 2 E〉 over the beam cross-section, assuming a uniform beam intensity and a Heaviside-shaped P(I)=θ(I-I c ) that turns on at some critical intensity I c(26). This model, however, is too optimistic for our interferometer, as the influence of intensity noise will rise sharply when the beam intensity I(r) approaches the critical intensity at a certain radius from the center of the beam.…”

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confidence: 99%

Measurement of the fine-structure constant as a test of the Standard Model

Parker

Zhong

et al. 2018

Science

885

734

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Measurements of the fine-structure constant α require methods from across subfields and are thus powerful tests of the consistency of theory and experiment in physics. Using the recoil frequency of cesium-133 atoms in a matter-wave interferometer, we recorded the most accurate measurement of the fine-structure constant to date: α = 1/137.035999046(27) at 2.0 × 10 accuracy. Using multiphoton interactions (Bragg diffraction and Bloch oscillations), we demonstrate the largest phase (12 million radians) of any Ramsey-Bordé interferometer and control systematic effects at a level of 0.12 part per billion. Comparison with Penning trap measurements of the electron gyromagnetic anomaly - 2 via the Standard Model of particle physics is now limited by the uncertainty in - 2; a 2.5σ tension rejects dark photons as the reason for the unexplained part of the muon's magnetic moment at a 99% confidence level. Implications for dark-sector candidates and electron substructure may be a sign of physics beyond the Standard Model that warrants further investigation.

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On measurement of the isotropy of the speed of light

Wojtsekhowski¹

2014

EPL

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Precise Matter and Antimatter Tests of the Standard Model with $${\mathrm{{e}}}^{-}, {\mathrm{{e}}}^{+}, {\mathrm{{p}}}, \,\overline{\mathrm{{p}}}$$ and $$\overline{\mathrm{{H}}}$$

Cited by 3 publications

References 71 publications

QED and Fundamental Symmetries in Positronium Decays

QED and Fundamental Symmetries in Positronium Decays

Measurement of the fine-structure constant as a test of the Standard Model

On measurement of the isotropy of the speed of light

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