1. Possible connections to R(D(*)) and the AMM of the muon
Andreas Crivellin
Theory Group of the Laboratory for Particle Physics
Possible connections to R(D(*)) and the AMM of the muon
CERN,

2. Introduction: New Physics and LFV b→sμμ b→cτν aμ
Outline
Introduction: New Physics and LFV
b→sμμ
b→cτν aμ
Simultaneous explanations with LQs
Conclusions
Andreas Crivellin

3. LFUV Hints for LFUV Lepton Flavour Universality Violation (LFUV)
Electron channels: SM like
b→sµµ 5-6σ
R(D(*)) 4σ
h→τµ 2σ
aµ 3σ
τ→µνν 2σ
Lepton Flavour Universality Violation (LFUV)
Andreas Crivellin

4. Chiral enhancement or very light particles
aμ explanations
MSSM
tan(ß) enhanced slepton loops
Scalars
Light scalars with enhanced muon couplings Z’
Very light with τμ couplings (mτ enhancement)
Leptoquarks
mt enhaned effects
e.g. D. Stockinger, hep-ph/
e.g. A. Broggio et at. arXiv: A.C. et al. arXiv:
e.g. W. Altmannshofer, C. Chen, P.S.B. Dev, A. Soni, arXiv:
e.g. A. Djouadi et al. Z.Phys. C46 (1990) M. Bauer, M. Neubert,
Chiral enhancement or very light particles 8

5. Scalar Leptoquarks in aμ
Chirally enhanced effects via top-loops
Left-, right- handed muons-top coupling
E. Leskow, A.C., G. D'Ambrosio, D. Müller arXiv:
Z→μμ at future colliders 8

6. Even high scale NP explanations possible
b→sμμ explanations Z’
Leptoquarks
Loop effects
Talks of David Straub and Javier Fuentes-Martin
Talks of
Ben Gripaios
and Ivan Nisandzic
Talk of Yotam Soreq
Even high scale NP explanations possible

7. R(D) & R(D*) explanations
Charged scalars
Problems with angular distributions and Bc lifetime W’
Leptoquark
Strong signals in qq→ττ searches
R. Alonso, B. Grinstein and J. Camalich,
A. Greljo, G. Isidori and D. Marzocca,
Talk of Mariano Quiros
Faroughy et al
Explanation difficult 8

8. R(D(*)) and b→sττ with Leptoquarks
Large couplings to the 2nd generation needed in order avoid collider bounds.
Cancelation in b→sνν needed: C(1)=-C(3)
Bs→ττ
very strongly enhanced
R. Alonso, B. Grinstein and J. Camalich,

9. Lepto-quarks Leptoquarks? h→τμ aμ R(D(*)) b→sμμ Z’ gauge boson
Higgses (Scalars)
h→τμ aμ
Lepto-quarks
b→sμμ
R(D(*))
Z’ gauge boson
Andreas Crivellin

10. R(D(*)), b→sμμ and aμ with Leptoquarks
Scalar leptoquark singlet + triplet with Y=-2/3
Cancelation in b→sνν imposed
AC, D. Mueller, T. Ota
2 out of 3 can be explained

11. Lμ-Lτ model for aμ and h→τμ and b→sμμ
W. Altmannshofer, M. Carena, AC,
Lμ-Lτ flavour symmetry
Flavon mixes with the Higgs
is protected
is not protected
Effects in 30

12. Lμ-Lτ model for aμ, h→τμ and b→sμμ
Can explain aμ & h→μτ without violating τ→μγ bounds

13. Exiting times in flavour physics are ahead of us!
Conclusions
Intriguing hints for Lepton Flavour Universality violating New Physics
Leptoquarks are a promising solution to the anomalies
Lμ-Lτ can explain the AMM of the muon, b→sμμ and h→τμ
R(D(*)) aμ
R(K(*)) NP
Exiting times in flavour physics are ahead of us!
Andreas Crivellin