g-2 of the Muon

Jungmann, Klaus-Peter

doi:10.1007/s10751-011-0518-y

Cited by 4 publications

(4 citation statements)

References 23 publications

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“…Experimentally, there is another long-standing 3.3σ experiment-theory discrepancy in the muon anomalous magnetic moment (g − 2) μ [8][9][10][11]. In addition, the isotope-shift measurement of 1S-2S transition between muonium and deuterium has a 1.4-ppm deviation from the current theory.…”

Section: Introductionmentioning

confidence: 99%

Refined determination of the muonium-deuterium 1S-2Sisotope shift through improved frequency calibration of iodine lines

Fan

Chang²,

Wang

et al. 2014

Phys. Rev. A

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We report a refined determination of muonium 1S-2S transition frequency and its isotope shift with deuterium by recalibrating the iodine reference lines using an optical frequency comb. The reference lines for the muonium and deuterium 1S-2S transitions are determined with a precision of 2.4 × 10 −10 and 1.7 × 10 −10 , respectively. An updated muonium-deuterium 1S-2S isotope-shift frequency is derived from these references to be 11 203 464.9(9.2)(4.0) MHz, in agreement with an updated bound-state quantum-electrodynamics prediction based on 2010 adjustments of Committee on Data for Science and Technology and 2.3 times better in the systematic uncertainty than V. Meyer et al.

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Section: Introductionmentioning

confidence: 99%

Refined determination of the muonium-deuterium 1S-2Sisotope shift through improved frequency calibration of iodine lines

Fan

Chang²,

Wang

et al. 2014

Phys. Rev. A

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show abstract

“…Experimentally, there is another long-standing 3.3σ experiment-theory discrepancy in the muon anomalous magnetic moment (g − 2) µ [8][9][10][11]. In addition, the isotope-shift measurement of 1S-2S transition between muonium and deuterium is only marginally in agreement with the current theory with a 1.4 ppm deviation.…”

mentioning

confidence: 77%

New Determination of Muonium-Deuterium 1S-2S Isotope Shift

Fan,

Chang,

Wang

et al. 2013

Preprint

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We report a new determination of muonium 1S-2S transition frequency and its isotope shift with deuterium by recalibrating the iodine reference lines using an optical frequency comb. The reference lines for the muonium and deuterium 1S-2S transitions are determined with a precision of 2.4×10 −10 and 1.7×10 −10 respectively. A new muonium-deuterium 1S-2S isotope-shift frequency is derived from these references to be 11 203 464.9(9.2)(4.0) MHz, in agreement with an updated bound-state quantum-electrodynamics prediction based on 2010 adjustments of Committee on Data for Science and Technology and 2.3 times better in the systematic uncertainty than the previous best determination.

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“…The so far best limit on the muon EDM has been established to be d e cm (90% C.L.). Because the measurement of the muon magnetic anomaly

a_{μ}

has yielded a manifest some 3.5 standard deviation difference between experiment and theory a new g‐2 experiment will be set up at Fermilab, Batavia, United States, to verify or refute a discrepancy, which would be a sign of New Physics . This new experiment aims for an improvement in

a_{μ}

by a factor of 5.…”

Section: Systems To Search For Edmsmentioning

confidence: 99%

Searching for electric dipole moments

Jungmann

2013

Annalen der Physik

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Searches for a permanent Electric Dipole Moment (EDM) of a fundamental particle provide a wide window for the discovery of potential New Physics. Within todays Standard Model in particle physics the well established violation of CP symmetry gives rise to EDMs which are several orders of magnitude below the present experimentally established upper bounds. On the other hand, EDMs appear quite naturally within many modern speculative theories, which have been suggested to improve the known shortcomings of the present Standard Model, e.g., the lack of giving reasons for certain established facts such as the mass hierarchy of the fundamental fermions or the number of three particle generations. They could be almost as large as the present experimental bounds. The speculative models provide for EDMs of different fundamental particles in specific ways. As there is no convincing indication, yet, which of the various extensions to the present standard theory may be more successful, a larger number of EDM searches is very well motivated. Still, even with the discovery of an EDM in one system several experiments will be required to pin down the precise nature and the underlying processes. Therefore searches are going on presently in a variety of systems, ranging from free leptons to complex condensed matter samples. These experiments utilize typically state of the art precision measurements which are often based on forefront technological developments. The experimental efforts are complemented and guided by the further development and refinement of particle theory. Here a few aspects of recent developments in this exciting field are summarized.

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g-2 of the Muon

Abstract: The experimental value a

Cited by 4 publications

References 23 publications

Refined determination of the muonium-deuterium 1S-2Sisotope shift through improved frequency calibration of iodine lines

Refined determination of the muonium-deuterium 1S-2Sisotope shift through improved frequency calibration of iodine lines

New Determination of Muonium-Deuterium 1S-2S Isotope Shift

Searching for electric dipole moments

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