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The experimental status of charged lepton flavor violation searches is briefly reviewed, with particular emphasis on the three classical searches involving muon transisions: $\mu \to e \gamma$, $\mu \to e$ conversion and $\mu \to 3e$.

High Energy Physics - Experiment · Physics 2013-08-01 Giovanni Signorelli

We investigate the feasibility of electroweak baryogenesis in a two-Higgs doublet model with lepton flavor violation. By scrutinizing the heavy Higgs boson mass spectrum, regions satisfying both strong first-order electroweak phase…

High Energy Physics - Phenomenology · Physics 2016-10-05 Cheng-Wei Chiang , Kaori Fuyuto , Eibun Senaha

The Mu2e experiment at Fermilab will search for the charged lepton flavor violating process of neutrino-less $\mu \to e$ coherent conversion in the field of an aluminum nucleus. About $7 \cdot 10^{17}$ muons, provided by a dedicated muon…

High Energy Physics - Experiment · Physics 2017-05-22 G. Pezzullo

The recent confirmation by FNAL of the $(g-2)_\mu$ muon anomaly gives strong evidence for the possible existence of new physics beyond the Standard Model in the muon sector. Thus it is worthy to revisit the existing experimental constraints…

High Energy Physics - Phenomenology · Physics 2021-10-27 Sergei Gninenko , Dmitry Gorbunov

Searches for new physics using muons are reviewed. Particular attention is paid to muon number non-conserving processes, like the decay muon-->e+gamma and muon-electron conversion in muonic atoms. Also, experimental determinations and…

High Energy Physics - Phenomenology · Physics 2009-10-30 Andrzej Czarnecki

If observed, charged lepton flavour violation is a clear sign of new physics - beyond the Standard Model minimally extended to accommodate neutrino oscillation data. After a brief review of several charged lepton flavour violation…

High Energy Physics - Phenomenology · Physics 2016-12-20 Ana M. Teixeira

The future muon collider has the potential to discover feebly interacting particles in a wide range of masses above the electroweak scale. It is particularly suitable to search for heavy neutral leptons (HNLs), as their production cross…

High Energy Physics - Phenomenology · Physics 2024-01-18 Oleksii Mikulenko , Mariia Marinichenko

A search for the lepton-flavor violating $\mu^{+}\rightarrow e^{+}\gamma$ decay using polarized muons is revisited in terms of suppression of the serious background arising from an accidental coincidence between a $e^{+}$ in the normal muon…

High Energy Physics - Phenomenology · Physics 2010-01-06 Yoshitaka Kuno , Akihiro Maki , Yasuhiro Okada

The paper describes an experiment aimed at studying muon capture by ${}^{3}\mathrm{He}$ nuclei in pure ${}^{3}\mathrm{He}$ and $\mathrm{D}_2 + {}^{3}\mathrm{He}$ mixtures at various densities. Energy distributions of protons and deuterons…

We explain anomalies currently present in various data samples used for the measurement of the anomalous magnetic moment of electron ($a_e$) and muon ($a_\mu$) in terms of an Aligned 2-Higgs Doublet Model with right-handed neutrinos. The…

High Energy Physics - Phenomenology · Physics 2021-03-24 Luigi Delle Rose , Shaaban Khalil , Stefano Moretti

We study supersymmetric extra U(1) model with $S_4$ flavor symmetry. The flavor symmetry not only stabilizes proton but also suppresses the flavor changing processes without raising the supersymmetry breaking scale. After the flavor…

High Energy Physics - Phenomenology · Physics 2020-12-01 Yasuhiro Daikoku , Hiroshi Okada

In the paper [1] the process of free muon capture with simultaneous excitation of a nuclear isomer has been suggested, claiming that ``the effect can be detectable for selected isotopes". Here, we argue that this claim can not be confirmed.…

Nuclear Theory · Physics 2023-07-13 Natalia S. Oreshkina , Julian C. Berengut

Searches for charged lepton flavor violation (CLFV) offer deep probes for a range of new physics scenarios, such as super-symmetric models, theories involving scalar leptoquarks or additional Higgs doublets, and models explaining the…

High Energy Physics - Experiment · Physics 2022-03-15 Sophie Middleton , MyeongJae Lee , Yoshihiro Seiya

The accurate prediction of the neutrino beam produced in muon decays and the absence of opposite helicity contamination for a particular neutrino flavor make a future neutrino factory the ideal place to look for the lepton flavor violating…

High Energy Physics - Phenomenology · Physics 2010-02-03 A. Bueno , M. Campanelli , M. Laveder , J. Rico , A. Rubbia

The recent experimental status, including the confirmation of the muon $g-2$ anomaly at Fermilab, indicates a Beyond Standard Model (BSM) satisfying the following properties: 1) it enhances the $g-2$ 2) suppresses flavor violations, such as…

High Energy Physics - Phenomenology · Physics 2021-09-01 Wen Yin

In a typical experiment the nuclear \mu-capture rate is determined from measurements of the time constant of the muon decay exponential in a target. We propose a new approach for the evaluation of the \mu-capture rate, which is based on…

Nuclear Experiment · Physics 2013-03-05 S. N. Gninenko

We study a simple one-loop induced neutrino mass model that contains both bosonic and fermionic dark matter candidates and has the capacity to explain the muon anomalous magnetic moment anomaly. We perform a comprehensive analysis by taking…

High Energy Physics - Phenomenology · Physics 2019-01-24 Cheng-Wei Chiang , Hiroshi Okada , Eibun Senaha

A confirmation of the long-standing muon $g$-2 discrepancy requires both experimental and theoretical progress. On the theory side, the hadronic corrections are under close scrutiny, as they induce the leading uncertainty of the Standard…

High Energy Physics - Phenomenology · Physics 2020-10-21 A. Masiero , P. Paradisi , M. Passera

The MuCap experiment measures the singlet rate Lambda_S of muon capture on the proton. A negative muon beam is stopped in a time projection chamber filled with ultra-pure hydrogen gas at 10 bar and room temperature. In combination with the…

Nuclear Experiment · Physics 2015-05-30 P. Winter

Exploring the leptonic sector in frontier experiments is more of importance nowadays, since the conservation of lepton flavor and total lepton number are not guaranteed anymore in the Standard Model after the discovery of neutrino…

High Energy Physics - Experiment · Physics 2017-10-25 Beomki Yeo , Yoshitaka Kuno , MyeongJae Lee , Kai Zuber