Physics potential for the measurement of sigma(H nu antinu ̄) x BR(H -->μ+μ-) at a 1.4 TeV CLIC collider

Measurements of Higgs couplings at CLIC will offer the potential for a rich precision phys- ics programme and for the search for physics beyond the Standard Model(SM). The poten- tial for measuring the SM Higgs boson decay into two muons at a 1.4 TeV CLIC collider is addressed in this paper. The study is performed using a full Geant4 detector simulation of the CLIC_ILD detector model, taking into consideration all the relevant physics and beam-induced background processes, as well as the instrumentation of the very forward region to identify high-energy electrons. In this analysis, we show that the branching ratio BR(H-->μ+μ-) times the Higgs production cross-section in W+W- fusion can be measured with 38% statistical accuracy at sqrt(s) = 1.4 TeV assuming an integrated luminosity of 1.5 ab-1 with unpolarised beams. If 80% electron beam polarisation is considered, as planned for CLIC, the statistical uncertainty of the measurement is 27%. Systematic uncertainties are negligible.