Status of the new measurement of electron magnetic moment

Fan, Xing; Gabrielse, Gerald; Sukra, Benedict; Myers, T. H.

doi:10.26226/m.6275705b66d5dcf63a311510

Cited by 4 publications

(2 citation statements)

References 47 publications

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“…Thus, d l occurs due to CP violations. For all charged leptons, predictions of µ l in SM [1][2][3][4] can be experimentally verified [5,6,16]. For d l the situation is essentially different.…”

Section: Introductionmentioning

confidence: 89%

Manifestation of the electric dipole moment in the decays of $τ$ leptons produced in $e^+e^-$ annihilation

Образцов¹,

Milstein²

2023

Preprint

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CP-odd asymmetries in the processes e + e − → τ + π − ν τ , e + e − → π + τ − ντ , e + e − → τ + ρ − ν τ , and e + e − → ρ + τ − ντ are investigated with account for longitudinal polarization of electrons (or positrons). These asymmetries is a manifestation of electric dipole form factor F τ 3 ≡ b in the γτ + τ − vertex. It is shown that to measure Im b, polarization is not needed, and to measure Re b, the polarization is not necessary, but simplifies the measurement of Re b.

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Section: Introductionmentioning

confidence: 89%

Manifestation of the electric dipole moment in the decays of $τ$ leptons produced in $e^+e^-$ annihilation

Образцов¹,

Milstein²

2023

Preprint

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“…In the electron anomalous magnetic-moment measurements, an electron has a small factor q e {m e [4,5]; thus, the spin precession owing to the gravitomagnetic effect is negligible compared with the magnetic one. On the other hand, the muon magnetic moment measurements used a magic momentum [2,3] of p " 4.094GeV corresponding to γ " 29.4 (β " 0.999421) to eliminate the spin precession due to the focusing electric field; thus, we can expect a sizable precession owing to the gravitomagnetic moment with the Earth's gravity.…”

mentioning

confidence: 99%

Gravitational Effect on Fundamental Physical Observables

Kurihara¹

2022

Preprint

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This report studies possible gravitational effects on measurements of fundamental physical observables such as the fine structure constant and the lepton magnetic moment. Although a static gravitational potential does not contribute to physical observables owing to Einstein's equivalent principle, a dynamic degree with finite momentum transfer can contribute to them. In other words, a laboratory frame fixed on the Earth is not an inertial system; thus, Earth's gravity can contribute to local observables. We investigate experimental results measuring the fine structure constant and electron and muon magnetic moments using the quantum field theoretic method under the Schwarzschild background field. We prepare classical vierbein and spin-connection fields owing to the Schwarzschild metric in the momentum space of the local Lorentz space and estimate possible gravitational effects at the surface of the Earth as O(10-9), which is consistent with the current discrepancy between measured and calculated values of the muon anomalous magnetic moment. On the other hand, the gravitational effect does not contribute to the fine structure constant measurements. We propose a possible test of gravitational effects in particle physics using precise measurement of muon properties in the J-PARK. PACS numbers: 04.62.+v,13.40.Em,13.40.Gp

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Feebly-interacting particles: FIPs 2022 Workshop Report

Antel,

Battaglieri,

Beacham

et al. 2023

Eur. Phys. J. C

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Particle physics today faces the challenge of explaining the mystery of dark matter, the origin of matter over anti-matter in the Universe, the origin of the neutrino masses, the apparent fine-tuning of the electro-weak scale, and many other aspects of fundamental physics. Perhaps the most striking frontier to emerge in the search for answers involves new physics at mass scales comparable to familiar matter, below the GeV-scale, or even radically below, down to sub-eV scales, and with very feeble interaction strength. New theoretical ideas to address dark matter and other fundamental questions predict such feebly interacting particles (FIPs) at these scales, and indeed, existing data provide numerous hints for such possibility. A vibrant experimental program to discover such physics is under way, guided by a systematic theoretical approach firmly grounded on the underlying principles of the Standard Model. This document represents the report of the FIPs 2022 workshop, held at CERN between the 17 and 21 October 2022 and aims to give an overview of these efforts, their motivations, and the decadal goals that animate the community involved in the search for FIPs.

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Status of the new measurement of electron magnetic moment

Cited by 4 publications

References 47 publications

Manifestation of the electric dipole moment in the decays of $τ$ leptons produced in $e^+e^-$ annihilation

Manifestation of the electric dipole moment in the decays of $τ$ leptons produced in $e^+e^-$ annihilation

Gravitational Effect on Fundamental Physical Observables

Feebly-interacting particles: FIPs 2022 Workshop Report

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