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25/10/2006 E. Accomando

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Higgs physics

at a linear e+e- collider

E. Accomando

INFN and Università di Torino


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Higgs search theory and experiment for the same goal

the collaboration will continue...


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After the Higgs discovery at the LHC

we want to see more and with higher precisionWe want tetermin The Higgs mass

Higgs Coupling to fermions, bosons and itself

Spin and CP quantum numbers

Higgs potential

What theory behind?

we first celebrate then


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LHC and LC interplay

LHC has the highest Higgs mass reach

• many more channels open but not clean

• discovery of heavy Higgses

LC strenght is in precision measurements

• typical accuracy from per mil to percent level

• quantum level effects

• indirect discovery of NP beyond LC energies

• deciphering the dynamics responsible for EWSB

Nice complementarity between the two machines


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Higgs mass measurement

e+e-

e+e- ZH WWqq

ee vvH ?

Below threshold?


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Higgs couplings

ee HZ

Ecm=350 GeV

L=500 fb-1

H ff

LHC@300 fb-1 =10-30 %


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Top Yukawa coupling

QCD and EW corrections

KNLO = 0.9 = -EW

KNLO = 1.5

Full LO in bbbblvqq

B-tag is crucial


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Top Yukawa couplinga very sensitive probe of possible new physics

combined


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Higgs self-couplingsa way to discriminate models beyond the SM

e+e- ZHH

e+e- vvHH


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From energy dependence of the Higgs production rate at threshold

Spin and CP quantum numbers

e+e- HZ

Mh=120 GeV


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SUSY Higgs

5 scalars: h, H, A, H+, H-

The LHC/LC interplay reveals crucial to test the underlying theory and recover the parameter space

Several possible scenarios:

• all five Higgses within reach at the LHC and LC

• only at the LHC

• just one visible Higgs


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Measuring the Higgs sectorscenario I: all Higgses at the LHC and LC

High accuracy on tan from LHC+LC


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Measuring the Higgs sector scenario II: heavy Higgses only at the LHC

Very sensitive consistency test of the MSSM


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Measuring the Higgs sectorscenario III: only the light Higgs at the LHC

Th vs exp: Indirect bounds on MA


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Monte Carlo EG for Higgs physics

From a low- mass Higgs

To an intermediate Higgs

CompHEP [Boos et al.]

Excalibur [Berends et al.]

Grc4f [Fujimoto et al.]

WPHACT [E.A., Ballestrero]

e+e- --> HZ, H --> 4f

HiggsPV [Montagna, et al.]

SIXPHACT [E.A., Ballestrero, Pizzio]

LUCIFER, SHERPA, MADEVENT, O’Mega Whizard

e+e- --> HZ, H --> 6f

H-->2f

H-->WW,ZZ-->4f


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Conclusions

Strong LHC/LC interplay to measure and understand

• Higgs properties

• EWSB dynamics

• and reveal the underlying theory

Great improvement from simultaneous running

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