scholarly journals Searching for muon to electron conversion: The Mu2e experiment at Fermilab

2019 ◽  
Author(s):  
Richard Bonventre
Keyword(s):  
Charged Lepton ◽  
Conversion Rate ◽  
New Physics ◽  
Previous Measurement ◽  
Negative Muon ◽  
Lepton Flavor ◽  
Wide Range ◽  
Electron Conversion ◽  
Design And Construction

The Mu2e experiment will measure the charged-lepton flavor violating (CLFV) neutrino-less conversion of a negative muon into an electron in the field of a nucleus. Mu2e will improve the previous measurement by four orders of magnitude, reaching a 90% C.L. limit of 8\times10^{-17}8×10−17 on the conversion rate. The experiment will reach mass scales of nearly 10^4104 TeV, far beyond the direct reach of colliders. The experiment is sensitive to a wide range of new physics, complementing and extending other CLFV searches. Mu2e is under design and construction at the Muon Campus of Fermilab; we expect to start taking physics data in 2022 with 3 years of running to achieve our target sensitivity.

scholarly journals A search for charged lepton flavor violation in the Mu2e experiment

2020 ◽  
Vol 35 (19) ◽  
pp. 2030007
Author(s):  
Manolis Kargiantoulakis
Keyword(s):  
Charged Lepton ◽  
New Physics ◽  
Muon Beam ◽  
Integrated System ◽  
Beyond The Standard Model ◽  
Lepton Flavor Violation ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Wide Range ◽  
Discovery Potential

The Mu2e experiment will search for the neutrino-less conversion of a muon into an electron in the field of an aluminum nucleus. An observation would be the first signal of charged lepton flavor violation and de facto evidence for new physics beyond the Standard Model. The clean signature of the conversion process offers an opportunity for a powerful search: Mu2e will probe four orders of magnitude beyond current limits, with real discovery potential over a wide range of well-motivated new physics models. This goal requires an integrated system of solenoids that will create the most intense muon beam in the world, and suppression of all possible background sources. The Mu2e components are currently being constructed, with the experiment planned to begin operations in the Fermilab Muon Campus within the next few years.

scholarly journals Status of the Mu2e experiment

2018 ◽  
Vol 179 ◽  
pp. 01003 ◽  
Author(s):  
S. Giovannella
Keyword(s):  
Charged Lepton ◽  
Rest Mass ◽  
Energetic Electron ◽  
High Energy ◽  
New Physics ◽  
Muon Decay ◽  
Negative Muon ◽  
Lepton Flavor ◽  
Current Limit ◽  
The Status

The Mu2e experiment at Fermilab searches for the charged-lepton flavor violating neutrino-less conversion of a negative muon into an electron in the field of an aluminum nucleus. The dynamics of such a process is well modelled by a two-body decay, resulting in a mono-energetic electron with an energy slightly below the muon rest mass. If no events are observed, in three years of running Mu2e will improve the current limit by four orders of magnitude. Such a charged lepton flavor-violating reaction probes new physics at a scale inaccessible with direct searches at either present or planned high energy colliders. The experiment both complements and extends the current search for muon decay to electron-photon at MEG and searches for new physics at the LHC. This paper focuses on the physics motivation, the design and the status of the experiment.

Search for muon to electron conversion at J-PARC: COMET experiment

2014 ◽  
Vol 31 ◽  
pp. 1460302 ◽  
Author(s):  
Y. Yuan ◽  
Keyword(s):  
Phase I ◽  
Charged Lepton ◽  
High Sensitivity ◽  
Electron Transition ◽  
Muonic Atom ◽  
Two Stage ◽  
Lepton Flavor ◽  
Electron Conversion ◽  
Very High

The COherent Muon to Electron Transition (COMET) experiment aims to search for the charged-lepton-flavor-violating process through measure muon to electron conversion in a muonic atom to very high sensitivity of 2.6 × 10-17. A two-stage approach in order to realize the experiment has been taken and the first-stage (COMET Phase-I) has been approved by KEK.

scholarly journals Charged lepton flavor violation in light of the muon magnetic moment anomaly and colliders

2021 ◽  
Vol 81 (9) ◽  
Author(s):  
Tong Li ◽  
Michael A. Schmidt ◽  
Chang-Yuan Yao ◽  
Man Yuan
Keyword(s):  
Magnetic Moment ◽  
Charged Lepton ◽  
New Physics ◽  
Lepton Flavor Violation ◽  
Lepton Sector ◽  
Gauge Invariant ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Muon Magnetic Moment ◽  
Charged Lepton Sector

AbstractAny observation of charged lepton flavor violation (CLFV) implies the existence of new physics beyond the SM in charged lepton sector. CLFV interactions may also contribute to the muon magnetic moment and explain the discrepancy between the SM prediction and the recent muon $$g-2$$ g - 2 precision measurement at Fermilab. We consider the most general SM gauge invariant Lagrangian of $$\Delta L=0$$ Δ L = 0 bileptons with CLFV couplings and investigate the interplay of low-energy precision experiments and colliders in light of the muon magnetic moment anomaly. We go beyond previous work by demonstrating the sensitivity of the LHC, the MACE experiment, a proposed muonium-antimuonium conversion experiment, and a muon collider. Currently-available LHC data is already able to probe unexplored parameter space via the CLFV process $$pp\rightarrow \gamma ^*/Z^*\rightarrow \ell _1^\pm \ell _1^\pm \ell _2^\mp \ell _2^\mp $$ p p → γ ∗ / Z ∗ → ℓ 1 ± ℓ 1 ± ℓ 2 ∓ ℓ 2 ∓ .

scholarly journals A search for muon-to-electron conversion at J-PARC: the COMET experiment

2013 ◽  
Vol 2013 (2) ◽  
Author(s):  
Yoshitaka Kuno
Keyword(s):  
Phase I ◽  
Charged Lepton ◽  
Lepton Flavor Violation ◽  
Experimental Search ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Current Limit ◽  
Electron Conversion

Abstract A new experimental search for the charged-lepton-flavor-violating process of neutrinoless muon-to-electron conversion by J-PARC E21 (the COMET experiment), which aims at a factor of 10 000 improvement over the current limit, is described, together with the physics motivation of charged lepton flavor violation. The first-stage approach of the COMET experiment (COMET Phase-I), which has recently been taken for earlier realization of the measurement, is also mentioned.

scholarly journals LEPTON FLAVOR VIOLATION DECAYS OF VECTOR MESONS IN UNPARTICLE PHYSICS

2012 ◽  
Vol 27 (30) ◽  
pp. 1250172 ◽  
Author(s):  
KE-SHENG SUN ◽  
TAI-FU FENG ◽  
LI-NA KOU ◽  
FEI SUN ◽  
TIE-JUN GAO ◽  
...  
Keyword(s):  
Charged Lepton ◽  
Conversion Rate ◽  
Lepton Flavor Violation ◽  
Vector Mesons ◽  
Lepton Sector ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Dimension Formula ◽  
Upper Limit ◽  
Charged Lepton Sector

We investigate the lepton flavor violation decays of vector mesons in the scenario of the unparticle physics by considering the constraint from μ-e conversion. In unparticle physics, the predictions of LFV decays of vector mesons depend strongly on the scale dimension [Formula: see text]. The predictions of LFV decays of vector mesons can reach the detective sensitivity in experiment in region of [Formula: see text], while the prediction of μ-e conversion rate can meet the experimental upper limit. For the searching of the lepton flavor violation processes of charged lepton sector in experiment, the process ϒ→eμ may be a promising one to be observed.

scholarly journals Search for lepton-flavor-violating tau-lepton decays to ℓγ at Belle

2021 ◽  
Vol 2021 (10) ◽  
Author(s):  
◽  
K. Uno ◽  
K. Hayasaka ◽  
K. Inami ◽  
I. Adachi ◽  
...  
Keyword(s):  
Standard Model ◽  
Charged Lepton ◽  
Branching Fractions ◽  
New Physics ◽  
Lepton Flavor Violation ◽  
Full Data ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
The Standard Model ◽  
Lepton Decays

Abstract Charged lepton flavor violation is forbidden in the Standard Model but possible in several new physics scenarios. In many of these models, the radiative decays τ± → ℓ±γ (ℓ = e, μ) are predicted to have a sizeable probability, making them particularly interesting channels to search at various experiments. An updated search via τ± → ℓ±γ using full data of the Belle experiment, corresponding to an integrated luminosity of 988 fb−1, is reported for charged lepton flavor violation. No significant excess over background predictions from the Standard Model is observed, and the upper limits on the branching fractions, $$ \mathcal{B} $$ B (τ± → μ±γ) ≤ 4.2 × 10−8 and $$ \mathcal{B} $$ B (τ± → e±γ) ≤ 5.6 × 10−8, are set at 90% confidence level.

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