1. Probing new physics in the Higgs sector with effective field theories at the Large Hadron Collider
B. Mellado
University of the Witwatersrand
SAIP 2015, Port Elizabeth, 30thJune – 4th July 2015

2. Work in collaboration with S. Banerjee, T. Mandal and B. Mukhopadhyaya
(arXiv: )
“Cornering dimension-6 HV V interactions at high energy LHC: the role of event ratios”

3. Spontaneous Symmetry Breaking

5. In the Standard Model there is a physical state, a Higgs boson with well defined couplings to weak bosons, fermions and self interactions
The exploration of the coupling to weak bosons plays now a pivotal role in understanding the nature of the scalar boson observed experimentally. New physics can be hidden in these couplings.

6. CP-conserving Dimension-6 Operators

7. Resulting Effective Interactions
where

8. Impact on Production Cross-sections

9. Impact on Decay

10. Definition of Ratios

12. 7+8 TeV
3000 fb-1
@ 14 TeV

13. 3000 fb-1
@ 14 TeV
R2 removes the the ambiguity inherent to R1

14. 3000 fb-1
@ 14 TeV

15. Summary of Results

16. Summary and Conclusions
Introduced CP-conserving Dimention-6 operators involving the Higgs doublet and the bosonic field strengths.
Derive effective interactions of the Higgs boson with WW, ZZ, γγ and Zγ
Define convenient three ratios that generate sensitivity to f_WW, f_W and f_B and cancel number of theoretical and experimental uncertainties
Obtain strong constraints with TeV with meaningful results with Run I data