Prospects on the EFT constraints from the off-shell Higgs - PowerPoint PPT Presentation

Prospects on the EFT constraints from the off-shell Higgs measurements Aleksandr Azatov CERN Higgs/EWSB meeting 24 Nov. 2014 work with C.Grojean,A.Paul, E.Salvioni arXiv:1406.6338

Off-shell Higgs production in gluon fusion gg → h → ZZ g 2 ◮ L = − c t m t v ¯ 48 π 2 c g h tth + v G µν G µν s ◮ on-shell production σ ∼ | c t + c g | 2 Z Z g g ◮ off-shell production : c t Z Z g g M gg → ZZ = M bcg + c t M c t + c g M c g Z g ∼ log 2 ˆ s c g M ++00 ∼ M ++00 M ++00 ∼ ˆ s , Z bcg c t m 2 c g g t ◮ New physics contribution grows with ˆ s - high energy bins become very important.

EFT interpretation ◮ c t , c g couplings can arise from the dimension-6 operators L dim-6 = c y y t | H | 2 c g g 2 Q L � ¯ 48 π 2 v 2 | H | 2 G µν G µν Ht R + h . c . + s v 2 g 2 m t v ¯ 48 π 2 c g h L = − c t tth + s v G µν G µν , c t = 1 − Re ( c y ) ◮ Operators modifying Higgs decay? ( D µ H ) † σ a D ν HW µν, a , ( D µ H ) † D ν HB µν , H † HB µν B µν , � � � � H † σ a ← → H † ← → ( D µ W µν ) a , ( D µ B µν ) D ν H D ν H contribute only to the transverse Z polarizations → growth with √ s is SM-like � � 2 H † ← → ⇒ hZ µ Z µ are strongly constrained by the on ◮ ( ∂ µ ( H † H )) 2 , D µ H shell measurements ◮ � hZ µ Z µ appears only at dim 8 level ( D µ H ) 2 � ( H † H ) Λ 4

High Luminosity 3 ab − 1 100 TeV FCC prospects 0.2 ◮ We simulate the signal and the background with the MCFM 6.8 code, 0.1 and bin the events in six categories √ ˆ s =(250, 400, 600, 800, 1100, c g 0.0 1500,2000,3000,4000,5000 ) GeV � 0.1 ◮ K- factors: we assume the same K-factor for the signal and the � 0.2 0.8 0.9 1.0 1.1 1.2 1.3 1.4 interfering background and calculate c t them using the ggHiggs code. 0.012 ◮ nonlinear analysis 0.010 ◮ 0.008 95% c t ∈ [0 . 96 , 1 . 07] P 0.006 ◮ linear analysis 95% c t ∈ [0 . 93 , 1 . 07] ◮ keeping √ s < 1 . 5 TeV 0.004 0.002 95% c t ∈ [0 . 92 , 1 . 13] 0.000 0.6 0.8 1.0 1.2 1.4 c t