B-Anomalies related to leptons and LFUV

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Presentation transcript:

B-Anomalies related to leptons and LFUV Andreas Crivellin

Outline: Introduction: Flavour anomalies Possible New Physics Explanations Z’ Extended Higgs sector Leptoquarks Simultaneous Explanations of Anomalies and predictions Outlook and Conclusions 2

Flavour Anomalies 3

Tauonic B decays Combined ≈4 σ deviation See talk of Zoltan Ligeti Tree-level decays in the SM via W-boson Combined ≈4 σ deviation 4

R(D) Explanations Leptoquark (scalar or vector) Charged Higgs different differential distribution W’ ??? 5

b→sμμ Global analysis give a very good fit to data Lepton Flavour Universality Violation Symmetry based solutions give a very good fit to data: See talk of Sebastien and Jorge 1501.04239 6 Fit is 4-5 σ better than in the SM

Z’ explanations allowed regions U. Haisch et al. 1308.1959 W. Altmannshofer et al. 1403.1269 A. C. et al. 1501.00993 ….. allowed regions 7

Leptoquarks Only weak constraints from other flavour observables (loop compared to tree) Possible effect in the anomalous magnetic moment of the muon Large production cross section at the LHC 8

2.6 σ difference from zero 8

No dominant contribution from vector-like fermions Can be explained in the effective field theory approach by No dominant contribution from vector-like fermions A. Falkowski, D. M. Straub, and A. Vicente, 1312.5329 Extended Higgs sector R. Harnik, J. Kopp, and J. Zupan, 1209.1397. G. Blankenburg, J. Ellis, and G. Isidori, 1202.5704. S. Davidson and P. Verdier, 1211.1248. J. Heeck et al. 1412.3671 A. Greljo et al. arXiv:1502.07784 A. C. et al. arXiv:1501.00993 ...... 8

Models for Simultaneous Explanations of Anomalies 11

2HDM with gauged Vectorial U(1) gauge group: Q(e) = 0, Q(μ) = 1, Q(τ) = -1 b-s couplings generated with vector-like quarks Two Higgs doublets Yukawa couplings diagonalizes the τ-μ block of the mass matrix 12

2HDM with gauged Lμ-Lτ 13

Leptoquark Explanations of b→sμμ and B→ D(*)τν Tree-level contribution to but loop effect in can explain Anarchic flavor structure Tree-level contribution to and Hierarchical flavor structure, large third generations couplings, small first and second ones. M. Bauer, M. Neubert arXiv:1511.01900 30

Tree-level Leptoquark Explanation Third generation couplings Misalignment between interaction and mass basis 15 L. Calibbi, A.C. and T. Ota, PRL, arXiv:1506.02661

2HDM of type X One Higgs doublet couples only to quarks the other Higgs doublet to leptons. Additional free parameters: Couplings to leptons are tan(β) enhanced

AC, Julian Heeck, Peter Stoffer. arXiv:1507.07567. PRL 2016

Prediction: Branching ratio can even reach the percent level AC, Julian Heeck, Peter Stoffer. arXiv:1507.07567. PRL 2016

Lμ-Lτ model for and Lμ-Lτ flavour symmetry Flavon mixes with the Higgs W. Altmannshofer, M. Carena, AC, 1604.08221 Lμ-Lτ flavour symmetry Flavon mixes with the Higgs is protected is not protected Effects in 30

Lμ-Lτ model for and Can also explain without violating bound 30

Conclusions Conclusions Extended Higgs sector Z’ gauge boson Leptoquarks Conclusions

Outlook (personal view) Leptoquarks 2HDM X Z’ Flavon model