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We perform a detailed analysis of lepton flavour violation (LFV) within minimal see-saw type extensions of the Standard Model (SM), which give a viable mechanism of neutrino mass generation and provide new particle content at the…

高能物理 - 唯象学 · 物理学 2015-06-05 D. N. Dinh , A. Ibarra , E. Molinaro , S. T. Petcov

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, $\mu^+ \to \mathrm{e}^+ \gamma$ experiments provide the best constraints…

This report presents the results of an experiment aimed at observation of the muon catalyzed $^3\!He\;d$ fusion reaction $^3\!He + \mu\;d\to^3\!He\;\mu\;d\to^4\!He(3.66MeV)+p(14.64MeV)+\mu$ which might occur after a negative muon stop in…

The NuTeV experiment at Fermilab has used a sign-selected neutrino beam to perform a search for the lepton number violating process nu_mu-bar e^- -> mu^- nu_e-bar, and to measure the cross-section of the Standard Model inverse muon decay…

高能物理 - 实验 · 物理学 2008-11-26 NuTeV Collaboration , J. A. Formaggio , J. Yu

Lepton flavor violation is one of the cleanest probes of physics beyond the standard model. In this work, we explore the sensitivity of the process $e^+ e^- \to \tau \mu$ to new physics above the TeV scale at the proposed circular…

高能物理 - 唯象学 · 物理学 2023-05-09 Wolfgang Altmannshofer , Pankaj Munbodh , Talise Oh

A next-generation rare pion decay experiment, PIONEER, is strongly motivated by several inconsistencies between Standard Model (SM) predictions and data pointing towards the potential violation of lepton flavor universality. It will probe…

We investigated mu+ decays at rest produced at the ISIS beam stop target. Lepton flavor (LF) conservation has been tested by searching for \nueb via the detection reaction p(\nueb,e+)n. No \nueb signal from LF violating mu+ decays was…

In this paper, we initiate the study of lepton flavor violating (LFV) dark matter (DM) interactions, expanding our focus beyond the flavor-conserving DM interactions typically considered in conventional direct and indirect detections. We…

高能物理 - 唯象学 · 物理学 2026-03-16 Sahabub Jahedi , Yi Liao , Xiao-Dong Ma

We present an illustrative discussion of the physics potential of $\mu^-$- $e^+$ conversion. We point out that this process, although much less frequently studied than the related but much more popular processes of $\mu^-$- $e^-$ conversion…

高能物理 - 唯象学 · 物理学 2017-01-25 Tanja Geib , Alexander Merle , Kai Zuber

We propose a 3500 ton (3000 ton fiducial volume) SiO_2 neutrino detector with sampling calorimetry, charged particle tracking, and muon spectrometers to run in a Tevatron Fixed Target Program. Improvements to the Fermilab accelerator…

Although the Lepton Flavor Violating (LFV) decay $\mu^+\to e^+ \gamma$ is forbidden in the Standard Model (SM), it can take place within various theories beyond the SM. If the branching ratio of this decay saturates its present bound [{\it…

高能物理 - 唯象学 · 物理学 2008-11-26 Yasaman Farzan

The Mu2e and COMET experiments are expected to improve existing limits on charged lepton flavor violation (CLFV) by roughly four orders of magnitude. $\mu\rightarrow e$ conversion experiments are typically optimized for electrons produced…

高能物理 - 唯象学 · 物理学 2025-01-08 W. C. Haxton , Evan Rule

This dissertation reviews the Standard Model formalism as well as the Lepton Flavour Violating (LFV) decay processes which cause its extension, known as the physics beyond the SM. Firstly, using the experimental bounds on three body LFV…

高能物理 - 唯象学 · 物理学 2016-09-06 M. Jamil Aslam

A search for the charged-lepton-flavor-violating process $Z\rightarrow e\mu$ is presented, using 139 fb$^{-1}$ of $\sqrt{s}=13$ TeV $pp$ collision data collected by the ATLAS experiment at the LHC. An excess in the $e\mu$ invariant mass…

高能物理 - 实验 · 物理学 2023-08-30 ATLAS Collaboration

We construct a scotogenic Majorana neutrino mass model in a gauged $U(1)_X$ extension of the standard model, where the mass of the gauge boson and the unbroken gauge symmetry, which leads to a stable dark matter (DM), can be achieved…

高能物理 - 唯象学 · 物理学 2022-10-19 Chuan-Hung Chen , Cheng-Wei Chiang , Takaaki Nomura , Chun-Wei Su

An overview of ATLAS and CMS studies of B_s leptonic decays providing constraints on the lepton flavour violation phenomenon is presented. Except direct lepton flavour violating final states B_s -> l_1^+ l_2^-, constraints can also be set…

高能物理 - 实验 · 物理学 2019-08-14 P. Reznicek

We use the BNL E821 measurement of g - 2, the anomalous magnetic moment of the muon, to normalize, within a supersymmetric GUT framework, constrained MSSM (CMSSM) predictions for processes that violate charged-lepton flavour conservation,…

高能物理 - 唯象学 · 物理学 2009-09-11 D. F. Carvalho , John Ellis , M. E. Gomez , S. Lola

In this paper we study axion-like particles (ALPs) with lepton-flavour-violating (LFV) couplings in the mass regime above the muon threshold, $m_a>m_\mu$, where the strong bound from the exotic muon decay $\mu\to ea$ no longer apply and the…

高能物理 - 唯象学 · 物理学 2026-04-15 Marco Ardu , Lorenzo Calibbi , Marco Fedele , Federico Mescia

We explore the feasibility of using TeV-energy muons to probe lepton-flavor-violating (LFV) processes mediated by an axion-like particle (ALP) $a$ with mass $\mathcal{O}(10~\textrm{GeV})$. We focus on $\mu\tau$ LFV interactions and assume…

高能物理 - 唯象学 · 物理学 2024-11-05 Brian Batell , Hooman Davoudiasl , Roman Marcarelli , Ethan T. Neil , Sebastian Trojanowski

Here we present the latest results of the charged Lepton Flavor Violation process searches at the BESIII experiment in the decay of $J/\psi$ to $e\mu$, using $(225.3\pm2.8)\times10^6$ $J/\psi$ events collected with the BESIII detector at…

高能物理 - 实验 · 物理学 2019-08-13 Ming-Gang Zhao