Abstract
The “Cabibbo Angle Anomaly” (CAA) originates from the disagreement between the CKM elements Vud and Vus extracted from superallowed beta and kaon decays, respectively, once compared via CKM unitarity. It points towards new physics with a significance of up to 4 σ, depending on the theoretical input used, and can be explained through modified W couplings to leptons. In this context, vector-like leptons (VLLs) are prime candidates for a corresponding UV completion since they can affect Wℓν couplings at tree-level, such that this modification can have the dominant phenomenological impact. In order to consistently assess agreement data, a global fit is necessary which we perform for gauge-invariant dimension-6 operators and all patterns obtained for the six possible representations (under the SM gauge group) of VLLs. We find that even in the lepton flavour universal case, including the measurements of the CKM elements Vus and Vud into the electroweak fit has a relevant impact, shifting the best fit point significantly. Concerning the VLLs we discuss the bounds from charged lepton flavour violating processes and observe that a single representation cannot describe experimental data significantly better than the SM hypothesis. However, allowing for several representations of VLLs at the same time, we find that the simple scenario in which N couples to electrons via the Higgs and Σ1 couples to muons not only explains the CAA but also improves the rest of the electroweak fit in such a way that its best fit point is preferred by more than 4 σ with respect to the begin.
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CMS collaboration, Highlights and perspectives from the CMS experiment, in the proceedings of the 5th Large Hadron Collider Physics Conference, May 15–20, Shangai, China (2017), arXiv:1709.03006 [INSPIRE].
ATLAS collaboration, ATLAS results and prospects with focus on beyond the Standard Model, Nucl. Part. Phys. Proc. 303-305 (2018) 43 [INSPIRE].
J.L. Hewett and T.G. Rizzo, Low-energy phenomenology of superstring inspired E6 models, Phys. Rept. 183 (1989) 193 [INSPIRE].
P. Langacker, Grand unified theories and proton decay, Phys. Rept. 72 (1981) 185 [INSPIRE].
F. del Aguila and M.J. Bowick, The possibility of new fermions with ∆I = 0 mass, Nucl. Phys. B 224 (1983) 107 [INSPIRE].
I. Antoniadis, A possible new dimension at a few TeV, Phys. Lett. B 246 (1990) 377 [INSPIRE].
N. Arkani-Hamed, S. Dimopoulos and J. March-Russell, Stabilization of submillimeter dimensions: the new guise of the hierarchy problem, Phys. Rev. D 63 (2001) 064020 [hep-th/9809124] [INSPIRE].
C. Csáki, TASI lectures on extra dimensions and branes, in the proceeings of the Theoretical Advanced Study Institute in Elementary Particle Physics (TASI 2002), June 2–28, Boulder, U.S.A. (2004) [hep-ph/0404096] [INSPIRE].
N. Arkani-Hamed, A.G. Cohen and H. Georgi, Electroweak symmetry breaking from dimensional deconstruction, Phys. Lett. B 513 (2001) 232 [hep-ph/0105239] [INSPIRE].
N. Arkani-Hamed, A.G. Cohen, E. Katz and A.E. Nelson, The littlest Higgs, JHEP 07 (2002) 034 [hep-ph/0206021] [INSPIRE].
M. Perelstein, Little Higgs models and their phenomenology, Prog. Part. Nucl. Phys. 58 (2007) 247 [hep-ph/0512128] [INSPIRE].
F. del Aguila, A. Carmona and J. Santiago, Neutrino masses from an A4 symmetry in holographic composite Higgs models, JHEP 08 (2010) 127 [arXiv:1001.5151] [INSPIRE].
A. Carmona and F. Goertz, Custodial leptons and Higgs decays, JHEP 04 (2013) 163 [arXiv:1301.5856] [INSPIRE].
P. Minkowski, μ → eγ at a rate of one out of 109 muon decays?, Phys. Lett. B 67 (1977) 421 [INSPIRE].
B.W. Lee and R.E. Shrock, Natural suppression of symmetry violation in gauge theories: muon-lepton and electron lepton number nonconservation, Phys. Rev. D 16 (1977) 1444 [INSPIRE].
R. Foot, H. Lew, X.G. He and G.C. Joshi, Seesaw neutrino masses induced by a triplet of leptons, Z. Phys. C 44 (1989) 441 [INSPIRE].
L3 collaboration, Search for heavy neutral and charged leptons in e+ e− annihilation at LEP, Phys. Lett. B 517 (2001) 75 [hep-ex/0107015] [INSPIRE].
ATLAS collaboration, Search for heavy neutral leptons in decays of W bosons produced in 13 TeV pp collisions using prompt and displaced signatures with the ATLAS detector, JHEP 10 (2019) 265 [arXiv:1905.09787] [INSPIRE].
CMS collaboration, Search for vector-like leptons in multilepton final states in proton-proton collisions at \( \sqrt{s} \) = 13 TeV, Phys. Rev. D 100 (2019) 052003 [arXiv:1905.10853] [INSPIRE].
M. Chala, P. Kozów, M. Ramos and A. Titov, Effective field theory for vector-like leptons and its collider signals, Phys. Lett. B 809 (2020) 135752 [arXiv:2005.09655] [INSPIRE].
A. Das, S. Mandal and T. Modak, Testing triplet fermions at the electron-positron and electron-proton colliders using fat jet signatures, Phys. Rev. D 102 (2020) 033001 [arXiv:2005.02267] [INSPIRE].
A. Das and S. Mandal, Bounds on the triplet fermions in type-III seesaw and implications for collider searches, arXiv:2006.04123 [INSPIRE].
A.S. De Jesus, S. Kovalenko, F.S. Queiroz, C. Siqueira and K. Sinha, Vectorlike leptons and inert scalar triplet: lepton flavor violation, g − 2, and collider searches, Phys. Rev. D 102 (2020) 035004 [arXiv:2004.01200] [INSPIRE].
P. Langacker and D. London, Mixing between ordinary and exotic fermions, Phys. Rev. D 38 (1988) 886 [INSPIRE].
ALEPH, DELPHI, L3, OPAL, LEP Electroweak collaboration, Electroweak measurements in electron-positron collisions at W-boson-pair energies at LEP, Phys. Rept. 532 (2013) 119 [arXiv:1302.3415] [INSPIRE].
ALEPH, DELPHI, L3, OPAL, SLD, LEP Electroweak Working Group, SLD Electroweak Group, SLD Heavy Flavour Group collaboration, Precision electroweak measurements on the Z resonance, Phys. Rept. 427 (2006) 257 [hep-ex/0509008] [INSPIRE].
F. del Aguila, J. de Blas and M. Pérez-Victoria, Effects of new leptons in electroweak precision data, Phys. Rev. D 78 (2008) 013010 [arXiv:0803.4008] [INSPIRE].
S. Antusch and O. Fischer, Non-unitarity of the leptonic mixing matrix: Present bounds and future sensitivities, JHEP 10 (2014) 094 [arXiv:1407.6607] [INSPIRE].
A. de Gouvêa and A. Kobach, Global constraints on a heavy neutrino, Phys. Rev. D 93 (2016) 033005 [arXiv:1511.00683] [INSPIRE].
E. Fernandez-Martinez, J. Hernandez-Garcia and J. Lopez-Pavon, Global constraints on heavy neutrino mixing, JHEP 08 (2016) 033 [arXiv:1605.08774] [INSPIRE].
M. Chrzaszcz, M. Drewes, T.E. Gonzalo, J. Harz, S. Krishnamurthy and C. Weniger, A frequentist analysis of three right-handed neutrinos with GAMBIT, Eur. Phys. J. C 80 (2020) 569 [arXiv:1908.02302] [INSPIRE].
A. Crivellin and M. Hoferichter, β decays as sensitive probes of lepton flavor universality, Phys. Rev. Lett. 125 (2020) 111801 [arXiv:2002.07184] [INSPIRE].
ATLAS collaboration, Measurement of the Higgs boson mass in the H → ZZ ∗ → 4ℓ and H → γγ channels with \( \sqrt{s} \) = 13 TeV pp collisions using the ATLAS detector, Phys. Lett. B 784 (2018) 345 [arXiv:1806.00242] [INSPIRE].
CMS collaboration, Measurements of properties of the Higgs boson decaying into the four-lepton final state in pp collisions at \( \sqrt{s} \) = 13 TeV, JHEP 11 (2017) 047 [arXiv:1706.09936] [INSPIRE].
CDF, D0 collaboration, Combination of CDF and D0 results on the mass of the top quark using up 9.7 fb−1 at the Tevatron, arXiv:1608.01881 [INSPIRE].
CMS collaboration, Measurement of the top quark mass using proton-proton data at \( \sqrt{s} \) = 7 and 8 TeV, Phys. Rev. D 93 (2016) 072004 [arXiv:1509.04044] [INSPIRE].
CMS collaboration, Measurement of the top quark mass with lepton+jets final states using pp collisions at \( \sqrt{s} \) = 13 TeV, Eur. Phys. J. C 78 (2018) 891 [arXiv:1805.01428] [INSPIRE].
CDF collaboration, Precise measurement of the W -boson mass with the CDF II detector, Phys. Rev. Lett. 108 (2012) 151803 [arXiv:1203.0275] [INSPIRE].
D0 collaboration, Measurement of the W boson mass with the D0 detector, Phys. Rev. D 89 (2014) 012005 [arXiv:1310.8628] [INSPIRE].
ATLAS collaboration, Measurement of the W -boson mass in pp collisions at \( \sqrt{s} \) = 7 TeV with the ATLAS detector, Eur. Phys. J. C 78 (2018) 110 [Erratum ibid. 78 (2018) 898] [arXiv:1701.07240] [INSPIRE].
B. Belfatto, R. Beradze and Z. Berezhiani, The CKM unitarity problem: a trace of new physics at the TeV scale?, Eur. Phys. J. C 80 (2020) 149 [arXiv:1906.02714] [INSPIRE].
Y. Grossman, E. Passemar and S. Schacht, On the statistical treatment of the Cabibbo angle anomaly, JHEP 07 (2020) 068 [arXiv:1911.07821] [INSPIRE].
A.M. Coutinho, A. Crivellin and C.A. Manzari, Global fit to modified neutrino couplings and the Cabibbo-Angle anomaly, Phys. Rev. Lett. 125 (2020) 071802 [arXiv:1912.08823] [INSPIRE].
M. Endo and S. Mishima, Muon g − 2 and CKM unitarity in extra lepton models, JHEP 08 (2020) 004 [arXiv:2005.03933] [INSPIRE].
K. Cheung, W.-Y. Keung, C.-T. Lu and P.-Y. Tseng, Vector-like quark interpretation for the CKM unitarity violation, excess in Higgs signal strength, and bottom quark forward-backward asymmetry, JHEP 05 (2020) 117 [arXiv:2001.02853] [INSPIRE].
C. Bobeth, A.J. Buras, A. Celis and M. Jung, Patterns of flavour violation in models with vector-like quarks, JHEP 04 (2017) 079 [arXiv:1609.04783] [INSPIRE].
B. Capdevila, A. Crivellin, C.A. Manzari and M. Montull, Explaining b → sℓ+ ℓ− and the Cabibbo angle anomaly with a vector triplet, arXiv:2005.13542 [INSPIRE].
BaBar collaboration, Evidence for an excess of \( \overline{B}\to {D}^{\left(\ast \right)}{\tau}^{-}{\overline{v}}_{\tau } \) decays, Phys. Rev. Lett. 109 (2012) 101802 [arXiv:1205.5442] [INSPIRE].
LHCb collaboration, Test of lepton flavor universality by the measurement of the B0 → D∗− τ + ντ branching fraction using three-prong τ decays, Phys. Rev. D 97 (2018) 072013 [arXiv:1711.02505] [INSPIRE].
Belle collaboration, Measurement of ℛ(D) and ℛ(D∗) with a semileptonic tagging method, arXiv:1904.08794 [INSPIRE].
LHCb collaboration, Test of lepton universality with B0 → K ∗0 ℓ+ ℓ− decays, JHEP 08 (2017) 055 [arXiv:1705.05802] [INSPIRE].
LHCb collaboration, Search for lepton-universality violation in B+ → K + ℓ+ ℓ− decays, Phys. Rev. Lett. 122 (2019) 191801 [arXiv:1903.09252] [INSPIRE].
HFLAV collaboration, Averages of b-hadron, c-hadron, and τ-lepton properties as of 2018, arXiv:1909.12524 [INSPIRE].
C. Murgui, A. Peñuelas, M. Jung and A. Pich, Global fit to b → cτν transitions, JHEP 09 (2019) 103 [arXiv:1904.09311] [INSPIRE].
R.-X. Shi, L.-S. Geng, B. Grinstein, S. Jäger and J. Martin Camalich, Revisiting the new-physics interpretation of the b → cτν data, JHEP 12 (2019) 065 [arXiv:1905.08498] [INSPIRE].
M. Blanke, A. Crivellin, T. Kitahara, M. Moscati, U. Nierste and I. Nišandžić, Addendum to “Impact of polarization observables and Bc → τν on new physics explanations of the b → cτν anomaly”, Phys. Rev. D100 (2019) 035035 arXiv:1905.08253 [INSPIRE].
A.K. Alok, D. Kumar, S. Kumbhakar and S. Uma Sankar, Solutions to RD − RD∗ in light of Belle 2019 data, Nucl. Phys. B 953 (2020) 114957 [arXiv:1903.10486] [INSPIRE].
M. Algueró et al., Emerging patterns of New Physics with and without Lepton Flavour Universal contributions, Eur. Phys. J. C 79 (2019) 714 [Addendum ibid. 80 (2020) 511] [arXiv:1903.09578] [INSPIRE].
J. Aebischer, W. Altmannshofer, D. Guadagnoli, M. Reboud, P. Stangl and D.M. Straub, B-decay discrepancies after Moriond 2019, Eur. Phys. J. C 80 (2020) 252 [arXiv:1903.10434] [INSPIRE].
M. Ciuchini et al., New Physics in b → sℓ+ ℓ− confronts new data on Lepton Universality, Eur. Phys. J. C 79 (2019) 719 [arXiv:1903.09632] [INSPIRE].
A. Arbey, T. Hurth, F. Mahmoudi, D.M. Santos and S. Neshatpour, Update on the b-s anomalies, Phys. Rev. D 100 (2019) 015045 [arXiv:1904.08399] [INSPIRE].
Muon g-2 collaboration, Final report of the muon E821 anomalous magnetic moment measurement at BNL, Phys. Rev. D 73 (2006) 072003 [hep-ex/0602035] [INSPIRE].
T. Aoyama et al., The anomalous magnetic moment of the muon in the standard model, Phys. Rept. 887 (2020) 1 [arXiv:2006.04822] [INSPIRE].
M. Davier, A. Hoecker, B. Malaescu and Z. Zhang, Reevaluation of the hadronic vacuum polarisation contributions to the Standard Model predictions of the muon g − 2 and α(\( {m}_Z^2 \)) using newest hadronic cross-section data, Eur. Phys. J. C 77 (2017) 827 [arXiv:1706.09436] [INSPIRE].
A. Keshavarzi, D. Nomura and T. Teubner, Muon g − 2 and α(\( {M}_Z^2 \)): a new data-based analysis, Phys. Rev. D 97 (2018) 114025 [arXiv:1802.02995] [INSPIRE].
M. Davier, A. Hoecker, B. Malaescu and Z. Zhang, A new evaluation of the hadronic vacuum polarisation contributions to the muon anomalous magnetic moment and to α(\( {m}_Z^2 \)), Eur. Phys. J. C 80 (2020) 241 [Erratum ibid. 80 (2020) 410] [arXiv:1908.00921] [INSPIRE].
A. Keshavarzi, D. Nomura and T. Teubner, g − 2 of charged leptons, α(\( {M}_Z^2 \)) , and the hyperfine splitting of muonium, Phys. Rev. D 101 (2020) 014029 [arXiv:1911.00367] [INSPIRE].
G. Colangelo, M. Hoferichter and P. Stoffer, Two-pion contribution to hadronic vacuum polarization, JHEP 02 (2019) 006 [arXiv:1810.00007] [INSPIRE].
B. Ananthanarayan, I. Caprini and D. Das, Pion electromagnetic form factor at high precision with implications to \( {a}_{\mu}^{\pi \pi} \) and the onset of perturbative QCD, Phys. Rev. D 98 (2018) 114015 [arXiv:1810.09265] [INSPIRE].
A. Crivellin, M. Hoferichter, C.A. Manzari and M. Montull, Hadronic Vacuum Polarization: (g − 2)μ versus Global Electroweak Fits, Phys. Rev. Lett. 125 (2020) 091801 [arXiv:2003.04886] [INSPIRE].
A. Keshavarzi, W.J. Marciano, M. Passera and A. Sirlin, Muon g − 2 and ∆α connection, Phys. Rev. D 102 (2020) 033002 [arXiv:2006.12666] [INSPIRE].
H. Davoudiasl and W.J. Marciano, Tale of two anomalies, Phys. Rev. D 98 (2018) 075011 [arXiv:1806.10252] [INSPIRE].
A. Crivellin, M. Hoferichter and P. Schmidt-Wellenburg, Combined explanations of (g − 2)μ,e and implications for a large muon EDM, Phys. Rev. D 98 (2018) 113002 [arXiv:1807.11484] [INSPIRE].
A. Czarnecki and W.J. Marciano, The muon anomalous magnetic moment: a harbinger for ‘new physics’, Phys. Rev. D 64 (2001) 013014 [hep-ph/0102122] [INSPIRE].
K. Kannike, M. Raidal, D.M. Straub and A. Strumia, Anthropic solution to the magnetic muon anomaly: the charged see-saw, JHEP 02 (2012) 106 [Erratum ibid. 10 (2012) 136] [arXiv:1111.2551] [INSPIRE].
R. Dermisek and A. Raval, Explanation of the muon g − 2 anomaly with vectorlike leptons and its implications for Higgs decays, Phys. Rev. D 88 (2013) 013017 [arXiv:1305.3522] [INSPIRE].
A. Freitas, J. Lykken, S. Kell and S. Westhoff, Testing the muon g − 2 anomaly at the LHC, JHEP 05 (2014) 145 [Erratum ibid. 09 (2014) 155] [arXiv:1402.7065] [INSPIRE].
A. Aboubrahim, T. Ibrahim and P. Nath, Leptonic g − 2 moments, CP phases and the Higgs boson mass constraint, Phys. Rev. D 94 (2016) 015032 [arXiv:1606.08336] [INSPIRE].
K. Kowalska and E.M. Sessolo, Expectations for the muon g − 2 in simplified models with dark matter, JHEP 09 (2017) 112 [arXiv:1707.00753] [INSPIRE].
S. Raby and A. Trautner, Vectorlike chiral fourth family to explain muon anomalies, Phys. Rev. D 97 (2018) 095006 [arXiv:1712.09360] [INSPIRE].
E. Megias, M. Quirós and L. Salas, gμ − 2 from vector-like leptons in warped space, JHEP 05 (2017) 016 [arXiv:1701.05072] [INSPIRE].
L. Calibbi, R. Ziegler and J. Zupan, Minimal models for dark matter and the muon g – 2 anomaly, JHEP 07 (2018) 046 [arXiv:1804.00009] [INSPIRE].
P. Arnan, A. Crivellin, M. Fedele and F. Mescia, Generic loop effects of new scalars and fermions in b → sℓ+ ℓ− and a vector-like 4th generation, JHEP 06 (2019) 118 [arXiv:1904.05890] [INSPIRE].
B. Gripaios, M. Nardecchia and S.A. Renner, Linear flavour violation and anomalies in B physics, JHEP 06 (2016) 083 [arXiv:1509.05020] [INSPIRE].
P. Arnan, L. Hofer, F. Mescia and A. Crivellin, Loop effects of heavy new scalars and fermions in b → sμ+ μ−, JHEP 04 (2017) 043 [arXiv:1608.07832] [INSPIRE].
J. Kawamura, S. Raby and A. Trautner, Complete vectorlike fourth family and new U(1)′ for muon anomalies, Phys. Rev. D 100 (2019) 055030 [arXiv:1906.11297] [INSPIRE].
J. Haller, A. Hoecker, R. Kogler, K. Mönig, T. Peiffer and J. Stelzer, Update of the global electroweak fit and constraints on two-Higgs-doublet models, Eur. Phys. J. C 78 (2018) 675 [arXiv:1803.01853] [INSPIRE].
J. de Blas et al., Electroweak precision observables and Higgs-boson signal strengths in the Standard Model and beyond: present and future, JHEP 12 (2016) 135 [arXiv:1608.01509] [INSPIRE].
W. Buchmüller and D. Wyler, Effective Lagrangian analysis of new interactions and flavor conservation, Nucl. Phys. B 268 (1986) 621 [INSPIRE].
B. Grzadkowski, M. Iskrzynski, M. Misiak and J. Rosiek, Dimension-six terms in the standard model Lagrangian, JHEP 10 (2010) 085 [arXiv:1008.4884] [INSPIRE].
A. Dedes, W. Materkowska, M. Paraskevas, J. Rosiek and K. Suxho, Feynman rules for the standard model effective field theory in Rξ-gauges, JHEP 06 (2017) 143 [arXiv:1704.03888] [INSPIRE].
J. de Blas, J.C. Criado, M. Pérez-Victoria and J. Santiago, Effective description of general extensions of the Standard Model: the complete tree-level dictionary, JHEP 03 (2018) 109 [arXiv:1711.10391] [INSPIRE].
R.N. Mohapatra and G. Senjanović, Neutrino mass and spontaneous parity nonconservation, Phys. Rev. Lett. 44 (1980) 912 [INSPIRE].
B. Bajc and G. Senjanović, Seesaw at LHC, JHEP 08 (2007) 014 [hep-ph/0612029] [INSPIRE].
B. Bajc, M. Nemevšek and G. Senjanović, Probing seesaw at LHC, Phys. Rev. D 76 (2007) 055011 [hep-ph/0703080] [INSPIRE].
J. Kersten and A.Y. Smirnov, Right-handed neutrinos at CERN LHC and the mechanism of neutrino mass generation, Phys. Rev. D 76 (2007) 073005 [arXiv:0705.3221] [INSPIRE].
R.N. Mohapatra and J.W.F. Valle, Neutrino mass and baryon number nonconservation in superstring models, Phys. Rev. D 34 (1986) 1642 [INSPIRE].
R. Coy and M. Frigerio, Effective approach to lepton observables: the seesaw case, Phys. Rev. D 99 (2019) 095040 [arXiv:1812.03165] [INSPIRE].
G. Ingelman and J. Rathsman, Heavy Majorana neutrinos at ep colliders, Z. Phys. C 60 (1993) 243 [INSPIRE].
F. del Aguila, J.A. Aguilar-Saavedra, A. Martinez de la Ossa and D. Meloni, Flavor and polarisation in heavy neutrino production at e+ e− colliders, Phys. Lett. B 613 (2005) 170 [hep-ph/0502189] [INSPIRE].
A. Crivellin, S. Najjari and J. Rosiek, Lepton flavor violation in the standard model with general dimension-six operators, JHEP 04 (2014) 167 [arXiv:1312.0634] [INSPIRE].
G.M. Pruna and A. Signer, The μ → eγ decay in a systematic effective field theory approach with dimension 6 operators, JHEP 10 (2014) 014 [arXiv:1408.3565] [INSPIRE].
A. Crivellin, S. Davidson, G.M. Pruna and A. Signer, Renormalisation-group improved analysis of μ → e processes in a systematic effective-field-theory approach, JHEP 05 (2017) 117 [arXiv:1702.03020] [INSPIRE].
D. Tommasini, G. Barenboim, J. Bernabeu and C. Jarlskog, Nondecoupling of heavy neutrinos and lepton flavor violation, Nucl. Phys. B 444 (1995) 451 [hep-ph/9503228] [INSPIRE].
A. Abada, C. Biggio, F. Bonnet, M.B. Gavela and T. Hambye, Low energy effects of neutrino masses, JHEP 12 (2007) 061 [arXiv:0707.4058] [INSPIRE].
M. Raidal et al., Flavour physics of leptons and dipole moments, Eur. Phys. J. C 57 (2008) 13 [arXiv:0801.1826] [INSPIRE].
SINDRUM collaboration, Search for the decay μ→ e+ e+ e− , Nucl. Phys. B 299 (1988) 1 [INSPIRE].
BaBar collaboration, Limits on τ lepton-flavor violating decays in three charged leptons, Phys. Rev. D 81 (2010) 111101 [arXiv:1002.4550] [INSPIRE].
K. Hayasaka et al., Search for lepton flavor violating τ decays into three leptons with 719 million produced τ + τ − pairs, Phys. Lett. B 687 (2010) 139 [arXiv:1001.3221] [INSPIRE].
LHCb collaboration, Search for the lepton flavour violating decay τ − → μ− μ+ μ−, JHEP 02 (2015) 121 [arXiv:1409.8548] [INSPIRE].
MEG collaboration, Search for the lepton flavour violating decay μ+ → e+ γ with the full dataset of the MEG experiment, Eur. Phys. J. C 76 (2016) 434 [arXiv:1605.05081] [INSPIRE].
BaBar collaboration, Searches for lepton flavor violation in the decays τ ± → e± γ and τ ± → μ± γ, Phys. Rev. Lett. 104 (2010) 021802 [arXiv:0908.2381] [INSPIRE].
V. Cirigliano, R. Kitano, Y. Okada and P. Tuzon, On the model discriminating power of μ → e conversion in nuclei, Phys. Rev. D 80 (2009) 013002 [arXiv:0904.0957] [INSPIRE].
A. Crivellin, M. Hoferichter and M. Procura, Improved predictions for μ → e conversion in nuclei and Higgs-induced lepton flavor violation, Phys. Rev. D 89 (2014) 093024 [arXiv:1404.7134] [INSPIRE].
R. Kitano, M. Koike and Y. Okada, Detailed calculation of lepton flavor violating muon electron conversion rate for various nuclei, Phys. Rev. D 66 (2002) 096002 [Erratum ibid. 76 (2007) 059902] [hep-ph/0203110] [INSPIRE].
T. Suzuki, D.F. Measday and J.P. Roalsvig, Total nuclear capture rates for negative muons, Phys. Rev. C 35 (1987) 2212 [INSPIRE].
SINDRUM II collaboration, A search for muon to electron conversion in muonic gold, Eur. Phys. J. C 47 (2006) 337 [INSPIRE].
A. Pich, Precision tau physics, Prog. Part. Nucl. Phys. 75 (2014) 41 [arXiv:1310.7922] [INSPIRE].
PiENu collaboration, Improved measurement of the π → eν branching ratio, Phys. Rev. Lett. 115 (2015) 071801 [arXiv:1506.05845] [INSPIRE].
Particle Data Group collaboration, Review of particle physics, Phys. Rev. D 98 (2018) 030001 [INSPIRE].
ATLAS collaboration, Test of the universality of τ and μ lepton couplings in W boson decays from \( t\overline{t} \) events at 13 TeV with the ATLAS detector, ATLAS-CONF-2020-014 (2020).
M. Jung and D.M. Straub, Constraining new physics in b → cℓν transitions, JHEP 01 (2019) 009 [arXiv:1801.01112] [INSPIRE].
CDF collaboration, Measurement of sin2 \( {\theta}_{\mathrm{eff}}^{\mathrm{lept}} \) using e+ e− pairs from γ∗ /Z bosons produced in \( p\overline{p} \) collisions at a center-of-momentum energy of 1.96 TeV, Phys. Rev. D 93 (2016) 112016 [Addendum ibid. 95 (2017) 119901] [arXiv:1605.02719] [INSPIRE].
D0 collaboration, Measurement of the effective weak mixing angle in \( p\overline{p} \) → Z/γ∗ → e+ e− events, Phys. Rev. Lett. 115 (2015) 041801 [arXiv:1408.5016] [INSPIRE].
CDF collaboration, Indirect measurement of sin2 θW (or MW) using μ+ μ− pairs from γ∗/Z bosons produced in \( p\overline{p} \) collisions at a center-of-momentum energy of 1.96 TeV, Phys. Rev. D 89 (2014) 072005 [arXiv:1402.2239] [INSPIRE].
CMS collaboration, Measurement of the weak mixing angle with the Drell-Yan process in proton-proton collisions at the LHC, Phys. Rev. D 84 (2011) 112002 [arXiv:1110.2682] [INSPIRE].
LHCb collaboration, Measurement of the forward-backward asymmetry in Z/γ∗ → μ+ μ− decays and determination of the effective weak mixing angle, JHEP 11 (2015) 190 [arXiv:1509.07645] [INSPIRE].
CDF, D0 collaboration, Combination of CDF and D0 W -boson mass measurements, Phys. Rev. D 88 (2013) 052018 [arXiv:1307.7627] [INSPIRE].
A. Sirlin, Radiative corrections in the SU(2)L × U(1) theory: a simple renormalization framework, Phys. Rev. D 22 (1980) 971 [INSPIRE].
J. De Blas et al., HEPfit: a code for the combination of indirect and direct constraints on high energy physics models, Eur. Phys. J. C 80 (2020) 456 [arXiv:1910.14012] [INSPIRE].
CMS collaboration, A measurement of the Higgs boson mass in the diphoton decay channel, Phys. Lett. B 805 (2020) 135425 [arXiv:2002.06398].
ATLAS collaboration, Measurement of the top quark mass in the \( t\overline{t} \) → lepton+jets channel from \( \sqrt{s} \) = 8 TeV ATLAS data and combination with previous results, Eur. Phys. J. C 79 (2019) 290 [arXiv:1810.01772] [INSPIRE].
CMS collaboration, Measurement of the top quark mass in the all-jets final state at \( \sqrt{s} \) = 13 TeV and combination with the lepton+jets channel, Eur. Phys. J. C 79 (2019) 313 [arXiv:1812.10534] [INSPIRE].
J.C. Hardy and I.S. Towner, Nuclear beta decays and CKM unitarity, in the proceedings of the 13th Conference on the Intersections of Particle and Nuclear Physics (CIPNAP 2018), May 29–June 3Palm Springs, U.S.A. (2018), arXiv:1807.01146 [INSPIRE].
C.Y. Seng, M. Gorchtein and M.J. Ramsey-Musolf, Dispersive evaluation of the inner radiative correction in neutron and nuclear β decay, Phys. Rev. D 100 (2019) 013001 [arXiv:1812.03352] [INSPIRE].
M. Gorchtein, γW box inside out: nuclear polarizabilities distort the beta decay spectrum, Phys. Rev. Lett. 123 (2019) 042503 [arXiv:1812.04229] [INSPIRE].
C.-Y. Seng, X. Feng, M. Gorchtein and L.-C. Jin, Joint lattice QCD-dispersion theory analysis confirms the quark-mixing top-row unitarity deficit, Phys. Rev. D 101 (2020) 111301 [arXiv:2003.11264] [INSPIRE].
A. Czarnecki, W.J. Marciano and A. Sirlin, Radiative Corrections to Neutron and Nuclear Beta Decays Revisited, Phys. Rev. D 100 (2019) 073008 [arXiv:1907.06737] [INSPIRE].
CKMfitter global fit results as of summer 19, http://ckmfitter.in2p3.fr/www/results/plots_summer19/num/ckmEval_results_summer19.html.
CKMfitter Group collaboration, CP violation and the CKM matrix: Assessing the impact of the asymmetric B factories, Eur. Phys. J. C 41 (2005) 1 [hep-ph/0406184] [INSPIRE].
M.M.V. Cirigliano and E. Passemar, The status os Vus, https://www.physics.umass.edu/acfi/sites/acfi/files/slides/moulson_amherst.pdf.
M. Moulson, Experimental determination of Vus from kaon decays, PoS(CKM2016)033 [arXiv:1704.04104] [INSPIRE].
N. Carrasco, P. Lami, V. Lubicz, L. Riggio, S. Simula and C. Tarantino, K → π semileptonic form factors with Nf = 2 + 1 + 1 twisted mass fermions, Phys. Rev. D 93 (2016) 114512 [arXiv:1602.04113] [INSPIRE].
Fermilab Lattice, MILC collaboration, |Vus| from Kℓ3 decay and four-flavor lattice QCD, Phys. Rev. D 99 (2019) 114509 [arXiv:1809.02827] [INSPIRE].
V. Cirigliano and H. Neufeld, A note on isospin violation in Pl2(γ) decays, Phys. Lett. B 700 (2011) 7 [arXiv:1102.0563] [INSPIRE].
M. Di Carlo et al., Light-meson leptonic decay rates in lattice QCD+QED, Phys. Rev. D 100 (2019) 034514 [arXiv:1904.08731] [INSPIRE].
Flavour Lattice Averaging Group collaboration, FLAG review 2019: Flavour Lattice Averaging Group (FLAG), Eur. Phys. J. C 80 (2020) 113 [arXiv:1902.08191] [INSPIRE].
R.J. Dowdall, C.T.H. Davies, G.P. Lepage and C. McNeile, Vus from π and K decay constants in full lattice QCD with physical u, d, s and c quarks, Phys. Rev. D 88 (2013) 074504 [arXiv:1303.1670] [INSPIRE].
N. Carrasco et al., Leptonic decay constants fK, fD, and \( {f}_{D_s} \) with Nf = 2 + 1 + 1 twisted-mass lattice QCD, Phys. Rev. D 91 (2015) 054507 [arXiv:1411.7908] [INSPIRE].
A. Bazavov et al., B- and D-meson leptonic decay constants from four-flavor lattice QCD, Phys. Rev. D 98 (2018) 074512 [arXiv:1712.09262] [INSPIRE].
A. Caldwell, D. Kollar and K. Kroninger, BAT: the Bayesian Analysis Toolkit, Comput. Phys. Commun. 180 (2009) 2197 [arXiv:0808.2552] [INSPIRE].
R. E. Kass and A. E. Raftery, Bayes factors, J. Am. Stat. Assoc. 90 (1995) 773.
JPARC E36 collaboration, Measurement of the Γ(K + → e+ ν)/Γ(K + → μ+ ν) branching ratio using stopped positive kaons at J-PARC, PoS(HQL2018)032 [INSPIRE].
Belle-II collaboration, The Belle II Physics Book, PTEP 2019 (2019) 123C01 [Erratum ibid. 2020 (2020) 029201] [arXiv:1808.10567] [INSPIRE].
PEN collaboration, PEN experiment: a precise test of lepton universality, in the proceedings of the 13th Conference on the Intersections of Particle and Nuclear Physics, May 29–June 3, Palm Springs, U.S.A. (2018), arXiv:1812.00782 [INSPIRE].
H. Baer et al., eds., The International Linear Collider technical design report — Volume 2: physics, arXiv:1306.6352 [INSPIRE].
R. Franceschini et al., The CLIC potential for new physics, arXiv:1812.02093 [INSPIRE].
FCC collaboration, FCC physics opportunities: Future Circular Collider conceptual design report volume 1, Eur. Phys. J. C 79 (2019) 474 [INSPIRE].
FCC collaboration, FCC-ee: the lepton collider: Future Circular Collider conceptual design report volume 2, Eur. Phys. J. ST 228 (2019) 261 [INSPIRE].
G. Apollinari et al., High-Luminosity Large Hadron Collider (HL-LHC): technical design report V. 0.1, CERN-2017-007-M (2017).
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Crivellin, A., Kirk, F., Manzari, C.A. et al. Global electroweak fit and vector-like leptons in light of the Cabibbo angle anomaly. J. High Energ. Phys. 2020, 166 (2020). https://doi.org/10.1007/JHEP12(2020)166
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DOI: https://doi.org/10.1007/JHEP12(2020)166