Physics potential for the measurement of σ (Hνν) × BR(H → μ+μ−) at a 1.4 TeV CLIC collider

The potential for the measurement of the branching ratio of the Standard Model-like Higgs boson decay into a μ+μ− pair at 1.4 TeV CLIC is analysed. The study is performed using the fully simulated CLIC_ILD detector concept, taking into consideration all the relevant physics and the beam-induced backgrounds. Despite the very low branching ratio of the H → μ+μ− decay, we show that the product of the branching ratio times the Higgs production cross section can be measured with a statistical uncertainty of 38 %, assuming an integrated luminosity of 1.5 ab−1 collected in five years of the detector operation at the 1.4 TeV CLIC with unpolarised beams. With polarised beams (+80 %, -30 %), the statistical uncertainty is better than 25%