Conveners
WG4
- Ljiljana Morvaj (Paul Scherrer Institute (CH))
WG4
- Kim Siang Khaw (Tsung-Dao Lee Institute, Shanghai Jiao Tong University)
WG4
- Simon Corrodi
WG4
- Ljiljana Morvaj (Paul Scherrer Institute (CH))
The Mu3e experiment at the Paul Scherrer Institute (PSI) will search for the charged lepton flavour violating decay µ⁺ → e⁺e⁻e⁺, improving the current best limit set by the SINDRUM experiment by four orders of magnitude.
Mu3e will be conducted in two phases. Phase I, currently under construction at the πE5 beamline at PSI, will utilise an intense DC surface muon beam of 10⁸ µ⁺/s to reach a...
The spontaneous conversion of muonium to antimuonium is one of the interesting charged lepton flavor violation phenomena, offering a sensitive probe of potential new physics and serving as a tool to constrain the parameter space beyond the Standard Model. The Muonium-to-Antimuonium Conversion Experiment (MACE) is designed to utilize a high-intensity muon beam, a Michel electron magnetic...
We propose here a set of new methods involving probing and knocking with muons (PKMu). There is a wealth of rich physics to explore with GeV muon beams. Examples include but not limited to: muon scattering can occur at large angles, providing evidence of potential muon-philic dark matter or dark mediator candidates; muon-electron scattering can be used to detect new types of bosons associated...
The J-PARC muon g-2/EDM experiment aims to precisely measure the anomalous magnetic moment and electric dipole moment based on a novel low-emittance muon beam. Such a beam is realized by a muon linear accelerator following a cooled muon source, which allows to employ different techniques than the BNL and FNAL experiments such as a compact storage ring without electric focusing and track...
The Muon g-2 Experiment at Fermilab has achieved a significant milestone by measuring the muon anomalous magnetic moment with a precision of 127 parts per billion (ppb), surpassing its original design goal of 140 ppb. This presentation provides an overview of the analysis of the anomalous precession frequency using the Run-4/5/6 dataset, which is crucial for the Muon g-2 measurement. We will...
The MUonE experiment at CERN aims to determine the leading-order hadronic contribution to the muon by an innovative approach, using elastic scattering of 160 GeV muons on atomic electrons in a low-Z target. The M2 beam line at CERN provides the necessary intensity needed to reach the statistical goal in few years of data taking. The experimental challenge relies in the precise control of the...
The new Muon g-2 experiment at Fermilab, while primarily designed to measure the muon's anomalous magnetic moment, also offers the unique opportunity to perform a world-leading search for the muon's electric dipole moment (EDM). Within the Standard Model, the muon EDM is predicted to be vanishingly small, orders of magnitude smaller than the reach of current experiments. However, some BSM...
We outline the physics case for the study of hadron edms that follow on from the successful FNAL g-2 muon experiment. The long term goal is making measurements of edms at, or below, the standard model expectation to provide quantifiable insight into the outstanding strong CP problem. The frozen spin technique spin technique is introduced and a possible lattice for the construction of such a...
The Mu2e experiment at Fermilab will search for the coherent, neutrinoless conversion of a negative muon into an electron in the field of an aluminum nucleus, an example of Charged Lepton Flavor Violation (CLFV). Observation of CLFV at Mu2e would be an unambiguous signal of physics beyond the Standard Model (BSM). Mu2e aims to improve upon the current best sensitivity on the conversion rate by...
The COMET experiment at J-PARC is designed to search for the neutrinoless, coherent conversion of a muon to an electron in the field of a nucleus ($\mu^-N \to e^-N$), a process that violates charged lepton flavor conservation and is forbidden in the Standard Model. The experiment aims to reach a single-event sensitivity of $\mathcal{O}(10^{-17})$, improving the current upper limit by four...
Searches for charged lepton flavor violation in the muon sector stand out among the most sensitive and clean probes for physics beyond the Standard Model. Currently, $\mu^+ \to e^+ \gamma$ experiments provide the best constraints in this field and, in the coming years, new experiments investigating the processes of $\mu^+ \to e^+e^+e^-$ and $\mu \to e$ conversion in the nuclear field are...
Tests of lepton flavor conservation and universality offer a sensitive probe for physics beyond the Standard Model (SM), with several BSM scenarios predicting deviations accessible at the CMS experiment. This contribution presents an overview of CMS results from searches for Lepton Flavor Violation (LFV) and Lepton Flavor Universality (LFU) violation in proton-proton collisions at a...
The Standard Model predicts several rare Higgs boson processes, including decays into a Z boson and a photon, a low-mass lepton pair and a photon, or a meson and a photon. Observing these rare decays would offer new and complementary insights into the Higgs boson's coupling structure beyond the more commonly studied channels. In addition, searches for lepton-flavor-violating decays of the...
The Belle and Belle II experiments have collected a $1.6~\mathrm{ab}^{-1}$ sample of $e^+e^-$ collision data at centre-of-mass energies near the $\Upsilon(nS)$ resonances. This sample contains approximately 1.5 billion $e^+e^-\to \tau^+\tau^{-}$ events, which we use to search for lepton-flavour violating decays. We present searches for $\tau\to\ell\gamma$, tau decay to three charged leptons,...
