Measurement Of The Branching Ratios For The Standard Model Higgs Decays Into Muon Pairs And Into Z Boson Pairs At A 1.4 TeV CLIC

Abstract

The measurement of the Higgs production cross-section times the branching ratios for its decays into mu(+)mu(-) and ZZ* pairs at a 1.4 TeV CLIC collider is investigated in this paper. The Standard Model Higgs boson with a mass of 126 GeV is dominantly produced via WW fusion in e(+)e(-) collisions at 1.4 TeV centre-of-mass energy. Analyses of both decay channels are based on a full simulation of the CLIC_ ILD detector. All relevant physics and beam-induced background processes are taken into account. An integrated luminosity of 1.5 ab(-1) and unpolarised beams are assumed. For the H - GT ZZ* decay, the purely hadronic final state (ZZ* - GT q (q) over barq (q) over bar) is considered as well as ZZ* decays into two jets and two leptons (ZZ* - GT qql(+)l(-)). It is shown that the branching ratio for the Higgs decay into a muon pair times the Higgs production cross-section can be measured with 38% statistical uncertainty. It is also shown that the statistical uncertainty of the Higgs branching ratio for decay into a Z boson pair times the Higgs production crosssection can be measured with a precision of 18.3% and 5.6% for the hadronic and semi-leptonic ZZ* decays, respectively.