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We consider theories where lepton flavor is violated, in particular concentrating on the four fermion operator consisting of three electrons and a tau. Strong constraints are available from existing searches for tau -> eee, requiring the…

High Energy Physics - Phenomenology · Physics 2015-01-14 Brandon Murakami , Tim M. P. Tait

We search for lepton flavor and lepton number violating tau decays into a lepton (ell = electron or muon) and two charged mesons (h,h' = pi^\pm or K^\pm), tau- -> ell-h+h'- and tau- -> ell+h-h'-, using 671 fb^{-1} of data collected with the…

High Energy Physics - Experiment · Physics 2009-12-22 Y. Miyazaki

Results are presented from a search for charged-lepton flavor violating (CLFV) interactions in top quark production and decay in pp collisions at a center-of-mass energy of 13 TeV. The events are required to contain one oppositely charged…

High Energy Physics - Experiment · Physics 2022-06-22 CMS Collaboration

The minimal type-I seesaw model provides a simple explanation of neutrino flavor oscillations and induces charged lepton flavor violation (cLFV). Despite extensive previous studies, semileptonic cLFV channels remain underexplored. Using…

High Energy Physics - Phenomenology · Physics 2026-04-30 Kevin A. Urquía-Calderón , Oleg Ruchayskiy

We carry out an exhaustive analysis of lepton flavor violating processes within the Simplest Little Higgs model. Its discovery could be expected from either $\mu\to e$ conversion in nuclei, $\mu\to e\gamma$ or $\mu\to3e$ decays. Then, the…

High Energy Physics - Phenomenology · Physics 2022-09-26 Enrique Ramirez , Pablo Roig

Lepton flavor violation (LFV) has been discovered in the neutrino sector by neutrino oscillation experiments. The minimally extended Standard Model (SM) to include neutrino masses allows LFV in the charged sector (CLFV) at the loop-level,…

High Energy Physics - Experiment · Physics 2022-04-12 MyeongJae Lee , Michael MacKenzie

A search for flavor violating decays of the Z boson to charged leptons is performed using data from proton-proton collisions at $\sqrt{s}$ = 13 TeV collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 138…

High Energy Physics - Experiment · Physics 2025-12-16 CMS Collaboration

We report on the status of charged lepton flavor violating (CLFV) experiments with muons. We focus on the three "golden channels": $\mu^{+} \rightarrow e^{+} \gamma$, $\mu^{+} \rightarrow e^{+} e^{-} e^{+}$ and $\mu^{-} N \rightarrow e^{-}…

High Energy Physics - Experiment · Physics 2025-05-09 Dylan Palo

The lepton flavour violating (LFV) $\tau$ decays $\tau\to (e,\mu)\gamma$ and $\tau\to 3\mu$ are investigated in the frameworks of the TeV scale type I see-saw and Higgs Triplet (or type II see-saw) models. Predictions for the rates of these…

High Energy Physics - Phenomenology · Physics 2015-06-16 D. N. Dinh , S. T. Petcov

The observation of lepton flavor violation indicates new physics beyond the Standard Model. Lepton colliders are ideal facilities to probe charged lepton flavor violation (CLFV) signals induced by new physics at high energy. In this work we…

High Energy Physics - Phenomenology · Physics 2019-04-03 Tong Li , Michael A. Schmidt

We consider the lepton-flavor violating(LFV) processes $l_{i}\to l_{j}\gamma$ in the framework of topcolor assisted technicolor(TC2) models. We find that the new gauge boson $Z^{\prime}$ predicted by TC2 models can give significantly…

High Energy Physics - Phenomenology · Physics 2018-01-17 Chongxing Yue , Qingjun Xu , Guoli Liu

We discuss sensitivities to lepton flavor violating (and conserving) interactions at future muon colliders, especially at $\mu^+\mu^+$ colliders. Compared with the searches for rare decays of $\mu$ and $\tau$, we find that the TeV-scale…

High Energy Physics - Phenomenology · Physics 2025-04-14 Kåre Fridell , Ryuichiro Kitano , Ryoto Takai

The search for lepton flavour violation in charged lepton decays is highly sensitive to physics beyond the Standard Model. Among the possible processes, $\mu$-decays are considered to have the largest discovery potential in most of the…

High Energy Physics - Experiment · Physics 2019-06-26 Luca Galli

Using the ZEUS detector at the HERA electron-proton collider, we have searched for lepton flavor violation in ep collisions at a center-of-mass energy s^1/2 of 300 GeV. Events of the type e + p -> lepton + X with a final-state lepton (mu or…

High Energy Physics - Experiment · Physics 2008-11-26 ZEUS Collaboration , M. Derrick et al

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 $\tau^{\pm}\rightarrow\ell^{\pm}\gamma$ ($\ell=e,\mu$) are predicted to have a…

High Energy Physics - Experiment · Physics 2021-10-08 K. Uno , K. Hayasaka , K. Inami , I. Adachi , H. Aihara , D. M. Asner , H. Atmacan , T. Aushev , R. Ayad , V. Babu , J. Bennett , F. Bernlochner , M. Bessner , V. Bhardwaj , J. Biswal , A. Bobrov , G. Bonvicini , A. Bozek , M. Brav , M. Campajola , D. v , M. -C. Chang , H. E. Cho , K. Cho , S. -J. Cho , S. -K. Choi , Y. Choi , S. Choudhury , D. Cinabro , S. Cunliffe , N. Dash , F. Di Capua , J. Dingfelder , Z. Dolev , T. V. Dong , S. Eidelman , D. Epifanov , T. Ferber , A. Frey , B. G. Fulsom , R. Garg , V. Gaur , N. Gabyshev , A. Garmash , A. Giri , P. Goldenzweig , C. Hadjivasiliou , T. Hara , O. Hartbrich , H. Hayashii , M. Hernandez Villanueva , W. -S. Hou , C. -L. Hsu , T. Iijima , G. Inguglia , A. Ishikawa , R. Itoh , M. Iwasaki , W. W. Jacobs , Y. Jin , K. K. Joo , K. H. Kang , Y. Kato , H. Kichimi , C. Kiesling , C. H. Kim , D. Y. Kim , K. -H. Kim , S. H. Kim , P. Kody\v , T. Konno , A. Korobov , S. Korpar , E. Kovalenko , P. Kri\v , R. Kroeger , P. Krokovny , T. Kuhr , M. Kumar , R. Kumar , K. Kumara , A. Kuzmin , Y. -J. Kwon , Y. -T. Lai , J. S. Lange , S. C. Lee , Y. B. Li , L. Li Gioi , J. Libby , K. Lieret , D. Liventsev , C. MacQueen , M. Masuda , K. Matsuoka , D. Matvienko , M. Merola , F. Metzner , K. Miyabayashi , R. Mizuk , G. B. Mohanty , M. Nakao , H. Nakazawa , A. Natochii , L. Nayak , M. Niiyama , N. K. Nisar , S. Nishida , K. Nishimura , K. Ogawa , S. Ogawa , P. Oskin , P. Pakhlov , G. Pakhlova , S. Pardi , H. Park , S. -H. Park , S. Paul , R. Pestotnik , L. E. Piilonen , T. Podobnik , E. Prencipe , M. T. Prim , M. R , A. Rostomyan , N. Rout , G. Russo , D. Sahoo , S. Sandilya , A. Sangal , L. Santelj , T. Sanuki , V. Savinov , G. Schnell , C. Schwanda , Y. Seino , K. Senyo , M. E. Sevior , C. Sharma , C. P. Shen , J. -G. Shiu , B. Shwartz , F. Simon , A. Sokolov , E. Solovieva , M. Stariv , Z. S. Stottler , M. Sumihama , T. Sumiyoshi , W. Sutcliffe , M. Takizawa , K. Tanida , Y. Tao , F. Tenchini , K. Trabelsi , M. Uchida , S. Uehara , T. Uglov , Y. Unno , S. Uno , P. Urquijo , Y. Ushiroda , Y. Usov , R. Van Tonder , G. Varner , A. Vinokurova , A. Vossen , E. Waheed , C. H. Wang , E. Wang , M. -Z. Wang , X. L. Wang , O. Werbycka , E. Won , B. D. Yabsley , W. Yan , H. Ye , J. H. Yin , Y. Yusa , Z. P. Zhang , V. Zhilich , V. Zhukova

We propose a new channel for probing charged lepton flavor violation (CLFV): the decay of true muonium into a lepton pair of different flavor, $(\mu^+ \mu^-) \to \mu^\pm e^\mp$. This purely leptonic two-body decay provides a clean…

High Energy Physics - Phenomenology · Physics 2025-08-08 Ryotaro Minato , Akira Sato , Ryosuke Suda , Masato Yamanaka

In this work, we study the charged lepton flavor violating (cLFV) decays $\tau-> \mu\gamma$, $\tau-> 3\mu$ and $Z->\mu\tau$ in the framework of the Supersymmetric economical 3-3-1 model. Analytic formulas for branching ratios (BR) of these…

High Energy Physics - Phenomenology · Physics 2013-05-06 L. T. Hue , D. T. Huong , H. N. Long

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

We explore the parameter space of lepton flavor violating (LFV) neutral Higgs Yukawa couplings with the muon and tau leptons that can be probed at the high-luminosity Large Hadron Collider (HL-LHC) via the vector boson fusion~(VBF) Higgs…

High Energy Physics - Phenomenology · Physics 2023-05-03 Rahool Kumar Barman , P. S. Bhupal Dev , Anil Thapa

We calculate the rates for the charged lepton flavour violating (LFV) decays l_i -> l_j gamma, tau -> l pi, tau -> l eta('), mu^- -> e^-e^+e^-, the six three-body leptonic decays tau^- -> l_i^- l_j^+ l_k^- and the rate for mu-e conversion…

High Energy Physics - Phenomenology · Physics 2014-11-21 Andrzej J. Buras , Björn Duling , Thorsten Feldmann , Tillmann Heidsieck , Christoph Promberger