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

Prospects on the EFT constraints from the

• ff-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 g Z Z c t g g Z Z g g Z Z c g

◮ L = −ct mt v ¯

tth +

g 2

s

48π2 cg h v GµνG µν ◮ on-shell production σ ∼ |ct + cg|2 ◮ off-shell production :

Mgg→ZZ = Mbcg + ctMct + cgMcg M++00

bcg

∼ M++00

ct

∼ log2 ˆ s m2

t

, M++00

cg

∼ ˆ s

◮ New physics contribution grows with ˆ

s - high energy bins become very important.

EFT interpretation

◮ ct, cg couplings can arise from the dimension-6 operators

Ldim-6 = cy

yt|H|2 v2

¯ QL HtR + h.c. +

cg g2

s

48π2v2 |H|2GµνG µν

L = −ct

mt v ¯

tth +

g2

s

48π2 cg h v GµνG µν,

ct = 1 − Re(cy)

◮ Operators modifying Higgs decay?

(DµH)† σaDνHW µν,a, (DµH)† DνHBµν, H†HBµνBµν,

• H†σa ←

→

D ν H

• (DµWµν)a,
• H† ←

→

D ν H

• (DµBµν)

contribute only to the transverse Z polarizations → growth with √s is SM-like

◮ (∂µ(H†H))2,

• H† ←

→

D µ H 2 ⇒ hZµZ µ are strongly constrained by the on shell measurements

◮ hZµZ µ appears only at dim 8 level (DµH)2(H†H)

Λ4

High Luminosity 3 ab−1 100 TeV FCC prospects

◮ We simulate the signal and the

background with the MCFM 6.8 code, and bin the events in six categories √ ˆ s=(250, 400, 600, 800, 1100, 1500,2000,3000,4000,5000 ) GeV

◮ K- factors: we assume the same

K-factor for the signal and the interfering background and calculate them using the ggHiggs code.

◮

◮ nonlinear analysis

95% ct ∈ [0.96, 1.07]

◮ linear analysis 95% ct ∈ [0.93, 1.07] ◮ keeping √s < 1.5 TeV

95% ct ∈ [0.92, 1.13]

0.8 0.9 1.0 1.1 1.2 1.3 1.4 0.2 0.1 0.0 0.1 0.2 ct cg 0.6 0.8 1.0 1.2 1.4 0.000 0.002 0.004 0.006 0.008 0.010 0.012 ct P