Lepton flavor violation in muonium decay and muon colliders in models with heavy neutrinos

Cvetič, Gorazd; Dib, Claudio O.; Kim, C. S.; Kim, J. D.

doi:10.1103/physrevd.74.093011

Cited by 7 publications

(11 citation statements)

References 46 publications

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“…In the presence of new physics, Muonium can also undergo the cLFV decay Mu → e + e − . In the SM extended by n s heavy neutral leptons, the cLFV Muonium decay rate is given by [98] BR…”

Section: B2 Muonic Atomsmentioning

confidence: 99%

On the role of leptonic CPV phases in cLFV observables

Abada,

Kriewald,

Teixeira

2021

Preprint

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In extensions of the Standard Model by Majorana fermions, the presence of additional CP violating phases has been shown to play a crucial role in lepton number violating processes. In this work we show that (Dirac and Majorana) CP violating phases can also lead to important effects in charged lepton flavour violating (cLFV) transitions and decays, in some cases with a significant impact for the predicted rates of cLFV observables. We conduct a thorough exploration of these effects in several cLFV observables, and discuss the implications for future observation. We emphasise how the presence of leptonic CP violating phases might lead to modified cLFV rates, and to a possible loss of correlation between cLFV observables.

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“…In the presence of new physics, Muonium can also undergo the cLFV decay Mu → e + e − . In the SM extended by n s heavy neutral leptons, the cLFV Muonium decay rate is given by [98] BR…”

Section: B2 Muonic Atomsmentioning

confidence: 99%

On the role of leptonic CPV phases in cLFV observables

Abada,

Kriewald,

Teixeira

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…In the presence of new physics, Muonium can also undergo the cLFV decay Mu → e + e − . In the SM extended by n s heavy neutral leptons, the cLFV Muonium decay rate is given by [105] BR…”

Section: B1 Loop Functionsmentioning

confidence: 99%

“…in which μ = G 2 F m 5 μ /(192π 3 ) denotes the muon decay width and α em = e 2 /4π the electromagnetic coupling constant, with |M tot | the full amplitude (summed (averaged) over final (initial) spins) [105],…”

Section: B1 Loop Functionsmentioning

confidence: 99%

On the role of leptonic CPV phases in cLFV observables

2021

View full text Add to dashboard Cite

In extensions of the standard model by Majorana fermions, the presence of additional CP violating phases has been shown to play a crucial role in lepton number violating processes. In this work we show that (Dirac and Majorana) CP violating phases can also lead to important effects in charged lepton flavour violating (cLFV) transitions and decays, in some cases with a significant impact for the predicted rates of cLFV observables. We conduct a thorough exploration of these effects in several cLFV observables, and discuss the implications for future observation. We emphasise how the presence of leptonic CP violating phases might lead to modified cLFV rates, and to a possible loss of correlation between cLFV observables.

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“…Formed in matter, muonium phenomena are studied in vacuum, and include several cLFV transitions; the study of the latter has the advantage of being free from nuclear uncertainties. Here we will consider the Muonium conversion Mu − Mu [13] and its cLFV decay Mu → e + e − [14].…”

Section: Jhep02(2016)083mentioning

confidence: 99%

“…with Γ µ the muon decay width, and where |M tot | denotes the full amplitude, summed (averaged) over final (initial) spins [14]. The full expression for |M tot | is given in appendix A; we notice that the intervening quantities are those also present for 3-body lepton decays (although the distinct form factors -penguins, long-range dipoles, boxes -contribute differently to the matrix element).…”

Section: Jhep02(2016)083mentioning

confidence: 99%

Impact of sterile neutrinos on nuclear-assisted cLFV processes

Abada

Romeri

Teixeira

2016

J. High Energ. Phys.

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We discuss charged lepton flavour violating processes occurring in the presence of muonic atoms, such as muon-electron conversion in nuclei CR(µ − e, N), the (Coulomb enhanced) decay of muonic atoms into a pair of electrons BR(µ − e − → e − e − , N), as well as Muonium conversion and decay, Mu − Mu and Mu → e + e − . Any experimental signal of these observables calls for scenarios of physics beyond the Standard Model. In this work, we consider minimal extensions of the Standard Model via the addition of sterile fermions, providing the corresponding complete analytical expressions for all the considered observables. We first consider an "ad hoc" extension with a single sterile fermion state, and investigate its impact on the above observables. Two well motivated mechanisms of neutrino mass generation are then considered: the Inverse Seesaw embedded into the Standard Model, and the νMSM. Our study reveals that, depending on their mass range and on the active-sterile mixing angles, sterile neutrinos can give significant contributions to the above mentioned observables, some of them even lying within present and future sensitivity of dedicated cLFV experiments. We complete the analysis by confronting our results to other (direct and indirect) searches for sterile fermions.

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Lepton flavor violation in muonium decay and muon colliders in models with heavy neutrinos

Cited by 7 publications

References 46 publications

On the role of leptonic CPV phases in cLFV observables

On the role of leptonic CPV phases in cLFV observables

On the role of leptonic CPV phases in cLFV observables

Impact of sterile neutrinos on nuclear-assisted cLFV processes

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