Speaker
Junping Tian
Description
We report on the recent studies of the precision measurement of the Higgs
couplings at the ILC based on the full detector simulation of the ILD detector
concept at various centre-of-mass energies including 250 GeV, 500 GeV, and 1
TeV. At 250 GeV, the Higgs recoil mass measurement is the key to determining
the absolute e+e- -> ZH cross section and hence the absolute model-independent
Higgs couplings. Around 350 GeV and above, the e+e- -> nunuH fusion channel is
available to study the Higgs. The ILC can measure Higgs branching ratios (BRs)
into bb, cc, gg, tautau, WW*, ZZ*, and gammagamma at all energies above 250
GeV. At 500 GeV and above, the e+e- -> ttH process can be used to measure
the top Yukawa coupling. At 1 TeV, the Higgs BRs into muon pairs can be
obtained due to the increased luminosity. The most precise Higgs couplings
are obtained via a global fit. The synergy with the LHC measurements is also
discussed.
It is a crucial and fundamental task to measure the Higgs self-coupling at the
future collider. In this talk, we will also introduce the ILD-DBD benchmark study
of ZHH at 500 GeV and vvHH (WW-fusion) at 1 TeV focusing on both Higgs bosons
decaying as H->bb.
