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The coherent conversion of a muon to an electron in a nuclear field has been one of the most powerful methods for searching for charged lepton flavor violation. Recent advancements have significantly enhanced the sensitivity of $\mu…

Instrumentation and Detectors · Physics 2025-06-16 Nicholas Cutsail , Johan Vonk , Vivek Singh , Yury G Kolomensky

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. Mu2e will reach a single event sensitivity of about $2.5\cdot…

Supersymmetric theories with significant lepton flavor violation have $\tilde{e}$ and $\tilde{\mu}$ nearly degenerate. In this case, pair production of $\tilde{e}^+ \tilde{e}^-$ and $\tilde{\mu}^+ \tilde{\mu}^-$ at LEPII and at the Next…

High Energy Physics - Phenomenology · Physics 2009-10-28 N. Arkani-Hamed , H. -C. Cheng , J. L. Feng , L. J. Hall

We study the lepton flavor violating decays such as $\mu\to e\gamma$, $\tau\to e\gamma$, $\tau\to \mu\gamma$ in the three-loop radiative seesaw model proposed by Krauss, Nasri, and Trodden. In this model, the relevant coupling constants are…

High Energy Physics - Phenomenology · Physics 2022-05-18 Osamu Seto , Tetsuo Shindou , Takanao Tsuyuki

We present an alternative implementation of the Kalman filter employed for track fitting within the LHCb experiment. It uses simple parametrizations for the extrapolation of particle trajectories in the field of the LHCb dipole magnet and…

Instrumentation and Detectors · Physics 2021-05-18 Pierre Billoir , Michel De Cian , Paul André Günther , Simon Stemmle

A track finding algorithm has been developed for reconstruction of e+e- pairs. It combines the information of the electromagnetic calorimeter with the information provided by the Tracker. Results on reconstruction efficiency of converted…

Data Analysis, Statistics and Probability · Physics 2017-08-23 Nancy Marinelli

One of the most computationally challenging problems expected for the High-Luminosity Large Hadron Collider (HL-LHC) is finding and fitting particle tracks during event reconstruction. Algorithms used at the LHC today rely on Kalman…

Taking the supersymmetric inverse seesaw mechanism as the explanation for neutrino oscillation data, we investigate charged lepton flavor violation in radiative and 3-body lepton decays as well as in neutrinoless $\mu-e$ conversion in…

High Energy Physics - Phenomenology · Physics 2014-11-18 A. Abada , M. E. Krauss , W. Porod , F. Staub , A. Vicente , C. Weiland

Since the discovery of neutrino oscillations it is known that lepton flavour is not conserved. Lepton flavour violating processes in the charged lepton sector have so far however eluded detection; as they are heavily suppressed in the…

High Energy Physics - Experiment · Physics 2013-02-11 Niklaus Berger

Considering the constraints from the experimental data on $\mu\rightarrow e\gamma$, $\mu\rightarrow3e$, $\mu-e$ conversion etc., we analyze the Lepton Flavor Violating decays $\phi(J/\Psi,\Upsilon(1S)) \rightarrow e^+\mu^-(\mu^+\tau^-)$ in…

High Energy Physics - Phenomenology · Physics 2015-06-11 Ke-Sheng Sun , Tai-Fu Feng , Tie-Jun Gao , Shu-Min Zhao

The MEG experiment took data at the Paul Scherrer Institute in the years 2009--2013 to test the violation of the lepton flavour conservation law, which originates from an accidental symmetry that the Standard Model of elementary particle…

We study lepton flavor violating analogs of the photoelectric effect, with a final $\mu$ or $\tau$ instead of an electron: $\gamma e\to \mu$ and $\gamma e\to \tau$. On the basis of the general parametrization of the matrix element of the…

High Energy Physics - Phenomenology · Physics 2008-11-26 Edson Carquin , Yuri Ivanov , Sergey Kovalenko , Ivan Schmidt

We study the lepton flavor violation (LFV), the leptonic magnetic moments $(g-2)_{\mu,\,e} $ and the electric dipole moment (EDM) of the electron in the Standard-Model Effective Field Theory with the $\Gamma_N$ modular flavor symmetry. We…

High Energy Physics - Phenomenology · Physics 2022-08-24 Tatsuo Kobayashi , Hajime Otsuka , Morimitsu Tanimoto , Kei Yamamoto

We consider charged lepton flavor violating transitions mediated by the diphoton effective interactions $\ell_i\ell_j\gamma\gamma$ and explore which processes can probe them better. Our analysis includes single and double radiative decays,…

High Energy Physics - Phenomenology · Physics 2023-07-13 Fabiola Fortuna , Xabier Marcano , Marcela Marín , Pablo Roig

The major challenge posed by the high instantaneous luminosity in the High Luminosity LHC (HL-LHC) motivates efficient and fast reconstruction of charged particle tracks in a high pile-up environment. While there have been efforts to use…

The Kalman Filter is a widely used approach for the linear estimation of dynamical systems and is frequently employed within nuclear and particle physics experiments for the reconstruction of charged particle trajectories, known as tracks.…

Instrumentation and Detectors · Physics 2025-03-04 Xiaocong Ai , Heather M. Gray , Andreas Salzburger , Nicholas Styles

This article presents the sensitivity of the ATLAS experiment to the lepton-flavour-violating decays of $\tau\to 3\mu$. A method utilising the production of $\tau$ leptons via $W\to\tau\nu$ decays is used. This method is applied to the…

High Energy Physics - Experiment · Physics 2016-05-03 ATLAS Collaboration

There is no guarantee that the violation of lepton number, assuming it exists, will primarily manifest itself in neutrinoless double beta decay ($0\nu\beta\beta$). Lepton-number violation and lepton-flavor violation may be related, and…

High Energy Physics - Phenomenology · Physics 2017-06-14 Jeffrey M. Berryman , André de Gouvêa , Kevin J. Kelly , Andrew Kobach

We study the sensitivity of the existing MEG data to lepton flavor violating axion-like particles produced through $\mu^+ \to e^+ a \gamma$ and estimate the discovery potential for the upcoming MEG II experiment in this channel. The MEG II…

High Energy Physics - Phenomenology · Physics 2022-10-26 Yongsoo Jho , Simon Knapen , Diego Redigolo

A sensitivity study for the search for the charged lepton flavor violating process $\tau \to \gamma\mu$ at the Super $\tau$-Charm Facility is performed with a fast simulation. With the expected performance of the current detector design and…

High Energy Physics - Experiment · Physics 2023-10-17 Teng Xiang , Xiao-Dong Shi , Da-Yong Wang , Xiao-Rong Zhou
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