Open Access

Constraining lepton flavor violating SMEFT $2 q 2 ℓ$ operators from low-energy charged lepton flavor-violating processes

Utpal Chattopadhyay^1,*, Debottam Das^2,3,†, Rahul Puri ^2,3,‡, and Joydeep Roy ^1,4,§

¹School of Physical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
²Institute of Physics, Sachivalaya Marg, Bhubaneswar, 751005, India
³Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400094, India
⁴Department of Physics, Acharya Institute of Technology, Bengaluru, 560107, Karnataka, India

^*Contact author: tpuc@iacs.res.in
^†Contact author: debottam@iopb.res.in
^‡Contact author: rahul.puri@iopb.res.in
^§Contact author: joydeeproy@acharya.ac.in, joyroy.phy@gmail.com

Phys. Rev. D 112, 115042 – Published 29 December, 2025

DOI: https://doi.org/10.1103/rqmt-mjcy

Abstract

Charged lepton flavor-violating (cLFV) processes, which are definite proof of new physics beyond the Standard Model, have remained experimentally elusive to date. Effective field theory (EFT) has been very useful in providing information about such new physics through the higher-dimensional operators. These operators respect SM gauge invariance, and they are suppressed by appropriate powers of the energy scale $Λ$ . In regard to lepton flavour violating (LFV) processes, the Standard Model effective field theory (SMEFT) is shown to be a useful tool for estimating any new physics effect at the scale $Λ$ . It is worth noting that a large class of cLFV processes involves both quarks and leptons. Thus, low-energy observables play a significant role in providing bounds on lepton-flavor-violating 2-quark-2-lepton ( $2 q 2 ℓ$ ) operators. In this work, we explore several low-energy cLFV processes that can be addressed within the SMEFT framework, relating them to the specific operators of relevance. Keeping in mind the correlation that exists among the SMEFT operators, we want to extract the strongest constraints on these $2 q 2 ℓ$ operators.

Physics Subject Headings (PhySH)

Article Text

References (120)

M. E. Peskin and D. V. Schroeder, An Introduction to Quantum Field Theory (Addison-Wesley, Reading, USA, 1995).
S. Myers and E. Picasso, The design, construction and commissioning of the CERN large electron positron collider, Contemp. Phys. 31, 387 (1990).
R. R. Wilson, The Tevatron, Phys. Today 30N10, 23 (1977).
L. Evans and P. Bryant, LHC machine, J. Instrum. 3, S08001 (2008).
G. Aad et al. (ATLAS Collaboration), Observation of a new particle in the search for the standard model Higgs boson with the ATLAS detector at the LHC, Phys. Lett. B 716, 1 (2012).
A. Crivellin and B. Mellado, Anomalies in particle physics, Nat. Rev. Phys. 6, 294 (2024).
D. E. Hazard and A. A. Petrov, Radiative lepton flavor violating B, D, and K decays, Phys. Rev. D 98, 015027 (2018).
B. Aubert et al. (BABAR Collaboration), Searches for lepton flavor violation in the decays $τ^{\pm} \to e^{\pm} γ$ and $τ^{\pm} \to μ^{\pm} γ$ , Phys. Rev. Lett. 104, 021802 (2010).
A. Abdesselam et al. (Belle Collaboration), Search for lepton-flavor-violating tau-lepton decays to $ℓ γ$ at Belle, J. High Energy Phys. 10 (2021) 19.
T. Ohshima (Belle Collaboration), Study of LFV in tau decay at Belle, Nucl. Phys. B, Proc. Suppl. 169, 174 (2007).
L. Aggarwal et al. (Belle-II Collaboration), Snowmass white paper: Belle II physics reach and plans for the next decade and beyond, arXiv:2207.06307.
B. Aubert et al. (BABAR Collaboration), Search for lepton flavor violating decays $τ^{\pm} \to ℓ^{\pm} π^{0}$ , $ℓ^{\pm} η$ , $ℓ^{\pm} η^{'}$ , Phys. Rev. Lett. 98, 061803 (2007).[
W. Altmannshofer et al. (Belle-II Collaboration), The Belle II physics book, Prog. Theor. Exp. Phys. 2019, 123C01 (2019); 2020, 029201(E) (2020).
N. Tsuzuki et al. (Belle Collaboration), Search for lepton-flavor-violating $τ$ decays into a lepton and a vector meson using the full Belle data sample, J. High Energy Phys. 06 (2023) 118.
I. Adachi et al. (Belle-II and Belle Collaborations), Search for lepton-flavor-violating $τ^{-} \to ℓ^{-} K_{s}^{0}$ decays at Belle and Belle II, J. High Energy Phys. 08 (2025) 092.
W. H. Bertl et al. (SINDRUM II Collaboration), A search for muon to electron conversion in muonic gold, Eur. Phys. J. C 47, 337 (2006).
P. Wintz, Results of the SINDRUM-II experiment, Conf. Proc. C 980420, 534 (1998).
L. Bartoszek et al. (Mu2e Collaboration), Mu2e technical design report, arXiv:1501.05241.
Y. Kuno (COMET Collaboration), A search for muon-to-electron conversion at J-PARC: The COMET experiment, Prog. Theor. Exp. Phys. 2013, 022C01 (2013).
R. Abramishvili et al. (COMET Collaboration), COMET phase-I technical design report, Prog. Theor. Exp. Phys. 2020, 033C01 (2020).
K. Afanaciev et al. (MEG II Collaboration), A search for $μ^{+} \to e^{+} γ$ with the first dataset of the MEG-II experiment, Eur. Phys. J. C 84, 216 (2024); 84, 1042(E) (2024).
M. Ablikim et al. (BESIII Collaboration), Search for the lepton flavor violating decay $J / ψ \to e μ$ , Sci. China Phys. Mech. Astron. 66, 221011 (2023).
M. Ablikim et al. (BESIII Collaboration), Search for the charged lepton flavor violating decay $J / ψ \to e τ$ , Phys. Rev. D 103, 112007 (2021).
M. Ablikim et al. (BES Collaboration), Search for the lepton flavor violation processes $J / ψ \to μ τ$ and $e τ$ , Phys. Lett. B 598, 172 (2004).
S. Patra et al. (Belle Collaboration), Search for charged lepton flavor violating decays of $ϒ (1 S)$ , J. High Energy Phys. 05 (2022) 095.
R. Dhamija et al. (Belle Collaboration), Search for charged-lepton flavor violation in $ϒ (2 S) \to ℓ^{\mp} τ^{\pm}$ ( $ℓ = e$ , $μ$ ) decays at Belle, J. High Energy Phys. 02 (2024) 187.
J. P. Lees et al. (BABAR Collaboration), Search for lepton flavor violation in $ϒ (3 S) \to e^{\pm} μ^{\mp}$ , Phys. Rev. Lett. 128, 091804 (2022).
J. P. Lees et al. (BABAR Collaboration), Search for charged lepton flavor violation in narrow upsilon decays, Phys. Rev. Lett. 104, 151802 (2010).
E. Cortina Gil et al. (NA62 Collaboration), Search for lepton number and flavor violation in $K^{+}$ and $π^{0}$ decays, Phys. Rev. Lett. 127, 131802 (2021).
R. Appel et al., An improved limit on the rate of decay $K^{+} \to π^{+} μ^{+} e^{-}$ , Phys. Rev. Lett. 85, 2450 (2000).
E. Abouzaid et al. (KTeV Collaboration), Search for lepton flavor violating decays of the neutral kaon, Phys. Rev. Lett. 100, 131803 (2008).
D. B. White et al., Search for the decays $η \to μ e$ and $η \to e^{+} e^{-}$ , Phys. Rev. D 53, 6658 (1996).
R. A. Briere et al. (CLEO Collaboration), Rare decays of the eta-prime, Phys. Rev. Lett. 84, 26 (2000).
M. Dugger et al., The Jefferson Lab eta Factory (JEF) experiment (2012).
J. Elam et al. (REDTOP Collaboration), The REDTOP experiment: Rare $η / η^{'}$ decays to probe new physics, arXiv:2203.07651.
D. Ambrose et al. (BNL Collaboration), New limit on muon and electron lepton number violation from $K_{L}^{0} \to μ^{\pm} e^{\mp}$ decay, Phys. Rev. Lett. 81, 5734 (1998).
A. Sher et al., An improved upper limit on the decay $K^{+} \to π^{+} μ^{+} e^{-}$ , Phys. Rev. D 72, 012005 (2005).
P. A. Zyla et al. (Particle Data Group), Review of particle physics, Prog. Theor. Exp. Phys. 2020, 083C01 (2020).
J. P. Lees et al. (BABAR Collaboration), Search for lepton-flavor-violating decays $D^{0} \to X^{0} e^{\pm} μ^{\mp}$ , Phys. Rev. D 101, 112003 (2020).
R. Aaij et al. (LHCb Collaboration), Searches for 25 rare and forbidden decays of $D^{+}$ and $D_{s}^{+}$ mesons, J. High Energy Phys. 06 (2021) 044.
R. Aaij et al. (LHCb Collaboration), Search for lepton-flavor violating decays $B^{+} \to K^{+} μ^{\pm} e^{\mp}$ , Phys. Rev. Lett. 123, 241802 (2019).
LHCb Collaboration, Search for the lepton-flavour violating decays $B^{0} \to K^{* 0} μ^{\pm} e^{\mp}$ and $B_{s}^{0} \to ϕ μ^{\pm} e^{\mp}$ , J. High Energy Phys. 06 (2023) 073.
B. Aubert et al. (BABAR Collaboration, Search for the rare decay $B \to π l^{+} l^{-}$ , Phys. Rev. Lett. 99, 051801 (2007).
R. Aaij et al. (LHCb Collaboration), Search for the lepton-flavour violating decays $B_{(s)}^{0} \to e^{\pm} μ^{\pm}$ , J. High Energy Phys. 03 (2018) 078.
R. Aaij et al. (LHCb Collaboration), Physics case for an LHCb upgrade II—Opportunities in flavour physics, and beyond, in the HL-LHC era, arXiv:1808.08865.
S. Watanuki et al. (Belle Collaboration), Search for the lepton flavor violating decays $B^{+} \to K^{+} τ^{\pm} ℓ^{\mp} (ℓ = e, μ)$ at Belle, Phys. Rev. Lett. 130, 261802 (2023).
LHCb Collaboration, Search for the lepton-flavour violating decays $B^{0} \to K^{* 0} τ^{\pm} μ^{\mp}$ , J. High Energy Phys. 06 (2023) 143.
J. P. Lees et al. (BABAR Collaboration), Search for the decay modes $B^{\pm} \to h^{\pm} τ ℓ$ , Phys. Rev. D 86, 012004 (2012).
R. Aaij et al. (LHCb Collaboration), Search for the lepton-flavor violating decay $B_{s}^{0} \to ϕ μ^{\pm} τ^{\mp}$ , Phys. Rev. D 110, 072014 (2024).
H. Atmacan et al. (Belle Collaboration), Search for $B^{0} \to τ^{\pm} ℓ^{\mp}$ ( $ℓ = e$ , $μ$ ) with a hadronic tagging method at Belle, Phys. Rev. D 104, L091105 (2021).
R. Aaij et al. (LHCb Collaboration), Search for the lepton-flavour-violating decays $B_{s}^{0} \to τ^{\pm} μ^{\mp}$ and $B^{0} \to τ^{\pm} μ^{\mp}$ , Phys. Rev. Lett. 123, 211801 (2019).
L. Nayak et al. (Belle Collaboration), Search for $B_{s}^{0} \to ℓ^{\mp} τ^{\pm}$ with the semi-leptonic tagging method at Belle, J. High Energy Phys. 08 (2023) 178.
H. Georgi, Effective field theory, Annu. Rev. Nucl. Part. Sci. 43, 209 (1993).
W. Buchmuller and D. Wyler, Effective Lagrangian analysis of new interactions and flavor conservation, Nucl. Phys. B268, 621 (1986).
P. Bechtle, C. Chall, M. King, M. Kraemer, P. Maettig, and M. Stöltzner, Bottoms up: Standard model effective field theory from a model perspective, arXiv:2201.08819.
B. Grzadkowski, M. Iskrzynski, M. Misiak, and J. Rosiek, Dimension-six terms in the standard model Lagrangian, J. High Energy Phys. 10 (2010) 085.
S. Davidson, Y. Kuno, and M. Yamanaka, Selecting $μ \to e$ conversion targets to distinguish lepton flavour-changing operators, Phys. Lett. B 790, 380 (2019).
A. Crivellin, S. Davidson, G. M. Pruna, and A. Signer, Renormalisation-group improved analysis of $μ \to e$ processes in a systematic effective-field-theory approach, J. High Energy Phys. 05 (2017) 117.
V. Cirigliano, S. Davidson, and Y. Kuno, Spin-dependent $μ \to e$ conversion, Phys. Lett. B 771, 242 (2017).
S. Davidson, Y. Kuno, and A. Saporta, “Spin-dependent” $μ \to e$ conversion on light nuclei, Eur. Phys. J. C 78, 109 (2018).
S. Davidson, Y. Kuno, Y. Uesaka, and M. Yamanaka, Probing $μ e γ γ$ contact interactions with $μ \to e$ conversion, Phys. Rev. D 102, 115043 (2020).
S. Davidson, Completeness and complementarity for $μ \to e γ μ \to e \bar{e} e$ and $μ A \to e A$ , J. High Energy Phys. 02 (2021) 172.
V. Cirigliano, K. Fuyuto, C. Lee, E. Mereghetti, and B. Yan, Charged lepton flavor violation at the EIC, J. High Energy Phys. 03 (2021) 256.
J. Kumar, Renormalization group improved implications of semileptonic operators in SMEFT, J. High Energy Phys. 01 (2022) 107.
A. Crivellin, S. Najjari, and J. Rosiek, Lepton flavor violation in the standard model with general dimension-six operators, J. High Energy Phys. 04 (2014) 167.
G. M. Pruna and A. Signer, The $μ \to e γ$ decay in a systematic effective field theory approach with dimension 6 operators, J. High Energy Phys. 10 (2014) 014.
R. Alonso, B. Grinstein, and J. Martin Camalich, $S U (2) \times U (1)$ gauge invariance and the shape of new physics in rare $B$ decays, Phys. Rev. Lett. 113, 241802 (2014).
J. Aebischer, A. Crivellin, M. Fael, and C. Greub, Matching of gauge invariant dimension-six operators for $b \to s$ and $b \to c$ transitions, J. High Energy Phys. 05 (2016) 037.
A. Crivellin, L. Hofer, J. Matias, U. Nierste, S. Pokorski, and J. Rosiek, Lepton-flavour violating $B$ decays in generic $Z^{'}$ models, Phys. Rev. D 92, 054013 (2015).
D. Bečirević, O. Sumensari, and R. Zukanovich Funchal, Lepton flavor violation in exclusive $b \to s$ decays, Eur. Phys. J. C 76, 134 (2016).
S. Descotes-Genon, D. A. Faroughy, I. Plakias, and O. Sumensari, Probing lepton flavor violation in meson decays with LHC data, Eur. Phys. J. C 83, 753 (2023).
M. I. Ali, U. Chattopadhyay, N. Rajeev, and J. Roy, SMEFT analysis of charged lepton flavor violating B-meson decays, Phys. Rev. D 109, 075028 (2024).
L. Calibbi, X. Marcano, and J. Roy, Z lepton flavour violation as a probe for new physics at future $e^{+} e^{-}$ colliders, Eur. Phys. J. C 81, 1054 (2021).
J. M. Cullen and B. D. Pecjak, Higgs decay to fermion pairs at NLO in SMEFT, J. High Energy Phys. 11 (2020) 079.
L. Calibbi, T. Li, X. Marcano, and M. A. Schmidt, Indirect constraints on lepton-flavor-violating quarkonium decays, Phys. Rev. D 106, 115039 (2022).
A. F. Zarnecki, Global analysis of $e e q q$ contact interactions and future prospects for high-energy physics, Eur. Phys. J. C 11, 539 (1999).
A. Ibarra, E. Masso, and J. Redondo, Systematic approach to gauge-invariant relations between lepton flavor violating processes, Nucl. Phys. B715, 523 (2005).
M. Carpentier and S. Davidson, Constraints on two-lepton, two quark operators, Eur. Phys. J. C 70, 1071 (2010).
F. Garosi, D. Marzocca, A. R. Sánchez, and A. Stanzione, Indirect constraints on top quark operators from a global SMEFT analysis, J. High Energy Phys. 12 (2023) 129.
E. Fernández-Martínez, X. Marcano, and D. Naredo-Tuero, Global lepton flavour violating constraints on new physics, Eur. Phys. J. C 84, 666 (2024).
M. I. Ali, U. Chattopadhyay, D. K. Ghosh, and N. Rajeev, Constraints on lepton flavor universal and non-universal new physics in $b \to s ℓ^{+} ℓ^{-}$ decays: A global SMEFT survey, arXiv:2502.20145.
I. Plakias and O. Sumensari, Lepton flavor violation in semileptonic observables, Phys. Rev. D 110, 035016 (2024).
J. de Blas, J. C. Criado, M. Perez-Victoria, and J. Santiago, Effective description of general extensions of the standard model: The complete tree-level dictionary, J. High Energy Phys. 03 (2018) 109.
U. Chattopadhyay, D. Das, and S. Mukherjee, Probing lepton flavor violating decays in MSSM with non-holomorphic soft terms, J. High Energy Phys. 06 (2020) 015.
B. De, D. Das, M. Mitra, and N. Sahoo, Magnetic moments of leptons, charged lepton flavor violations and dark matter phenomenology of a minimal radiative Dirac neutrino mass model, J. High Energy Phys. 08 (2022) 202.
V. Gherardi, D. Marzocca, and E. Venturini, Matching scalar leptoquarks to the SMEFT at one loop, J. High Energy Phys. 07 (2020) 225; 01 (2021) 006(E).
A. Buras, Gauge Theory of Weak Decays (Cambridge University Press, Cambridge, England, 2020), 10.1017/9781139524100.
C. Bobeth and A. J. Buras, Leptoquarks meet $ϵ^{'} / ϵ$ and rare kaon processes, J. High Energy Phys. 02 (2018) 101.
W. Dekens, J. de Vries, M. Jung, and K. K. Vos, The phenomenology of electric dipole moments in models of scalar leptoquarks, J. High Energy Phys. 01 (2019) 069.
J. Aebischer, A. J. Buras, and J. Kumar, SMEFT ATLAS: The landscape beyond the standard model, arXiv:2507.05926.
E. E. Jenkins, A. V. Manohar, and M. Trott, Renormalization group evolution of the standard model dimension six operators I: Formalism and lambda dependence, J. High Energy Phys. 10 (2013) 087.
E. E. Jenkins, A. V. Manohar, and M. Trott, Renormalization group evolution of the standard model dimension six operators II: Yukawa dependence, J. High Energy Phys. 01 (2014) 035.
R. Alonso, E. E. Jenkins, A. V. Manohar, and M. Trott, Renormalization group evolution of the standard model dimension six operators III: Gauge coupling dependence and phenomenology, J. High Energy Phys. 04 (2014) 159.
B. Grinstein, M. J. Savage, and M. B. Wise, $B \to X_{s} e^{+} e^{-}$ in the six quark model, Nucl. Phys. B319, 271 (1989).
E. E. Jenkins, A. V. Manohar, and P. Stoffer, Low-energy effective field theory below the electroweak scale: Operators and matching, J. High Energy Phys. 03 (2018) 016.
E. E. Jenkins, A. V. Manohar, and P. Stoffer, Low-energy effective field theory below the electroweak scale: Anomalous dimensions, J. High Energy Phys. 01 (2018) 084.
J. Aebischer, J. Kumar, and D. M. Straub, wilson: A python package for the running and matching of Wilson coefficients above and below the electroweak scale, Eur. Phys. J. C 78, 1026 (2018).
D. M. Straub, flavio: A python package for flavour and precision phenomenology in the standard model and beyond, arXiv:1810.08132.
G. Buchalla, A. J. Buras, and M. E. Lautenbacher, Weak decays beyond leading logarithms, Rev. Mod. Phys. 68, 1125 (1996).
G. Burdman, E. Golowich, J. L. Hewett, and S. Pakvasa, Rare charm decays in the standard model and beyond, Phys. Rev. D 66, 014009 (2002).
S. de Boer and G. Hiller, Flavor and new physics opportunities with rare charm decays into leptons, Phys. Rev. D 93, 074001 (2016).
F. J. Gilman and M. B. Wise, $K \to π e^{+} e^{-}$ in the six quark model, Phys. Rev. D 21, 3150 (1980).
T. Inami and C. S. Lim, Effects of superheavy quarks and leptons in low-energy weak processes $K_{L} \to μ \bar{μ}$ , $K^{+} \to π^{+}$ Neutrino anti-neutrino and $K^{0} \leftrightarrow {\bar{K}}^{0}$ , Prog. Theor. Phys. 65, 297 (1981); 65, 1772(E) (1981).
C. Dib, I. Dunietz, and F. J. Gilman, $K_{L} \to π^{0} l^{+} l^{-}$ decays for large $m_{t}$ , Phys. Rev. D 39, 2639 (1989).
P. Ball and R. Zwicky, $B_{d, s} \to ρ, ω, K^{*}, ϕ$ decay form-factors from light-cone sum rules revisited, Phys. Rev. D 71, 014029 (2005).
A. Khodjamirian, T. Mannel, and N. Offen, Form-factors from light-cone sum rules with B-meson distribution amplitudes, Phys. Rev. D 75, 054013 (2007).
C.-D. Lu and W. Wang, Analysis of $B \to K_{J}^{*} (\to K π) μ^{+} μ^{-}$ in the higher kaon resonance region, Phys. Rev. D 85, 034014 (2012).
D. E. Hazard and A. A. Petrov, Lepton flavor violating quarkonium decays, Phys. Rev. D 94, 074023 (2016).
M. Hoferichter, J. Menéndez, and F. Noël, Improved limits on lepton-flavor-violating decays of light pseudoscalars via spin-dependent $μ \to e$ conversion in nuclei, Phys. Rev. Lett. 130, 131902 (2023).
A. Crivellin, G. D’Ambrosio, M. Hoferichter, and L. C. Tunstall, Violation of lepton flavor and lepton flavor universality in rare kaon decays, Phys. Rev. D 93, 074038 (2016).
Fayyazuddin, M. J. Aslam, and C.-D. Lu, Lepton flavor violating decays of $B$ and $K$ mesons in models with extended gauge group, Int. J. Mod. Phys. A 33, 1850087 (2018).
A. Ryd and A. A. Petrov, Hadronic $D$ and $D_{s}$ meson decays, Rev. Mod. Phys. 84, 65 (2012).
A. Abada, D. Bečirević, M. Lucente, and O. Sumensari, Lepton flavor violating decays of vector quarkonia and of the $Z$ boson, Phys. Rev. D 91, 113013 (2015).
J. Aebischer, J. Kumar, P. Stangl, and D. M. Straub, A global likelihood for precision constraints and flavour anomalies, Eur. Phys. J. C 79, 509 (2019).
Y. Kuno and Y. Okada, Muon decay and physics beyond the standard model, Rev. Mod. Phys. 73, 151 (2001).[
R. Kitano, M. Koike, and Y. Okada, Detailed calculation of lepton flavor violating muon electron conversion rate for various nuclei, Phys. Rev. D 66, 096002 (2002); 76, 059902(E) (2007).
T. S. Kosmas, S. Kovalenko, and I. Schmidt, Nuclear $μ \to e$ conversion in strange quark sea, Phys. Lett. B 511, 203 (2001).
A. A. Petrov and D. V. Zhuridov, Lepton flavor-violating transitions in effective field theory and gluonic operators, Phys. Rev. D 89, 033005 (2014).
V. Cirigliano, R. Kitano, Y. Okada, and P. Tuzon, On the model discriminating power of $μ \to e$ conversion in nuclei, Phys. Rev. D 80, 013002 (2009).
M. A. Shifman, A. I. Vainshtein, and V. I. Zakharov, QCD and resonance physics. Theoretical foundations, Nucl. Phys. B147, 385 (1979).

Phys. Rev. D 112, 115042– Published 29 December, 2025

Vol. 112, Iss. 11 — 1 December 2025

Received 15 August 2025
Accepted 26 November 2025

DOI: https://doi.org/10.1103/rqmt-mjcy

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

Published by the American Physical Society

Physical Review D

Reuse & Permissions

Export citation

Export citation

Constraining lepton flavor violating SMEFT $2 q 2 ℓ$ operators from low-energy charged lepton flavor-violating processes

Abstract

Physics Subject Headings (PhySH)

Article Text

References (120)

Outline

Information

Filter

Filter

Article Lookup

Enter a citation

Constraining lepton flavor violating SMEFT 2q2ℓ operators from low-energy charged lepton flavor-violating processes

Abstract

Physics Subject Headings (PhySH)

Article Text

References (120)

Constraining lepton flavor violating SMEFT $2 q 2 ℓ$ operators from low-energy charged lepton flavor-violating processes