Search for muon-electron and muon-positron conversion

Ahmad, S.; Azuelos, G.; Blecher, M.; Bryman, D. A.; Burnham, R. A.; Clifford, E. T. H.; Depommier, P.; Dixit, M. S.; Gotow, K.; Hargrove, C. K.; Hasinoff, M.; Leitch, M. J.; Macdonald, J. A.; Mes, H.; Navon, I. M.; Numao, T.; Poutissou, J. M.; Poutissou, R.; Schlatter, P.; Spuller, J.; Summhammer, Johann

doi:10.1103/physrevd.38.2102

Cited by 66 publications

(36 citation statements)

References 48 publications

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“…As a result, stringent constraints can be placed on the models from the experimental limits on µ → eγ, τ → µγ, [145] µ-e conversion in nuclei [515,516], muoniumantimuonium oscillation [517,518], etc. For instance, the MEGA limit on µ → eγ leads to the constraint [511] ε e ε µ ≈ 0 .…”

Section: Nutev Physicsmentioning

confidence: 99%

Theory of neutrinos: a white paper

et al. 2007

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During 2004, four divisions of the American Physical Society commissioned a study of neutrino physics to take stock of where the field is at the moment and where it is going in the near and far future. Several working groups looked at various aspects of this vast field. The summary was published as a main report entitled "The Neutrino Matrix" accompanied by short 50 page versions of the report of each working group. Theoretical research in this field has been quite extensive and touches many areas and the short 50 page report [1] provided only a brief summary and overview of few of the important points. The theory discussion group felt that it may be of value to the community to publish the entire study as a white paper and the result is the current article. After a brief overview of the present knowledge of neutrino masses and mixing and some popular ways to probe the new physics implied by recent data, the white paper summarizes what can be learned about physics beyond the Standard Model from the various proposed neutrino experiments. It also comments on the impact of the experiments on our understanding of the origin of the matter-antimatter asymmetry of the Universe and the basic nature of neutrino interactions as well as the existence of possible additional neutrinos. Extensive references to original literature are provided.2

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Section: Nutev Physicsmentioning

confidence: 99%

Theory of neutrinos: a white paper

et al. 2007

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“…Historic overview of constraints on µ [194] SREL (1972) < 1.6 × 10 [196] TRIUMF (1985) < 1.6 × 10 [197] TRIUMF (1988) < 4.6 × 10 [199] PSI (1998) < 6.1 × 10 [197] TRIUMF (1988) < 4.9 × 10 [200] PSI (1996) < 4.6 × 10…”

Section: µ − E Conversionmentioning

confidence: 99%

A call for new physics: The muon anomalous magnetic moment and lepton flavor violation

2018

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We review how the muon anomalous magnetic moment (g − 2) and the quest for lepton flavor violation are intimately correlated. Indeed the decay µ → eγ is induced by the same amplitude for different choices of in-and outgoing leptons. In this work, we try to address some intriguing questions such as:Which hierarchy in the charged lepton sector one should have in order to reconcile possible signals coming simultaneously from g − 2 and lepton flavor violation?What can we learn if the g − 2 anomaly is confirmed by the upcoming flagship experiments at FERMILAB and J-PARC, and no signal is seen in the decay µ → eγ in the foreseeable future? On the other hand, if the µ → eγ decay is seen in the upcoming years, do we need to necessarily observe a signal also in g − 2?.In this attempt, we generally study the correlation between these observables in a detailed analysis of simplified models. We derive master integrals and

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“…In the aspect of experimental study, the current upper limits for muon-electron conversion in the nuclear field are given by the experiments at TRIUMF and PSI. The upper limit for gold is 7 × 10 −13 from the results of SINDRUM-II experiment at PSI [7], and upper limits for titanium are 4.3 × 10 −12 and 4.6 × 10 −12 from the results of SINDRUM-II [8] and an experiment at TRIUMF [9], respectively. The experimental results are getting closer to the level of thoeretical predictions and it is possible to reach the predicted level by improving the experimental sensitivity by only a few orders of magnitude.…”

Section: Introductionmentioning

confidence: 93%

Silicon Carbide Target for a Muon-Electron Conversion Search at J-PARC MLF

Nakatsugawa¹,

Aoki²,

Meigo³

et al. 2015

Proceedings of the 2nd International Symposium on Science at J-Parc — Unlocking the Mysteries of Life, Matter and the Universe

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It is considered that muon-electron conversion would be one of the most obvious evidence of the new physics beyond the standard model. An experimental search for muon-electron conversion in the nuclear field, DeeMe, is proposed at J-PARC Materials and Life Science Experimental Facility (MLF). DeeMe experiment will be carried out at a brand-new beamline (H-Line) which will be constructed at J-PARC MLF Muon Science Establishment (MUSE). The single event sensitivity achieved by the experiment with the current graphite production target of MUSE is estimated to be 1.2 × 10 −13 . This is smaller than the current upper limit but it is desirable to make the experiment more sensitive. In order to improve the sensitivity, it is planned to replace the graphite target with a silicon carbide (SiC) target. Thanks to the larger pion production rate and the larger muon capture rate of silicon nucleus, the number of muonic atoms formed in a SiC target is expected to be totally 6 times as large as in a graphite target and then the single event sensitivity for SiC target is estimated to be 2.1 × 10 −14 , nearly two orders of magnitudes below current upper limit. The current status of the preparation for the use of a SiC target is reported.

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Search for muon-electron and muon-positron conversion

Cited by 66 publications

References 48 publications

Theory of neutrinos: a white paper

Theory of neutrinos: a white paper

A call for new physics: The muon anomalous magnetic moment and lepton flavor violation

Silicon Carbide Target for a Muon-Electron Conversion Search at J-PARC MLF

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