Prospects of measuring the branching fraction of the Higgs boson decaying into muon pairs at the International Linear Collider
AbstractThe prospects for measuring the branching fraction of $$H \rightarrow \mu ^{+} \mu ^{-}$$ H → μ + μ - at the International Linear Collider (ILC) have been evaluated based on a full detector simulation of the International Large Detector (ILD) concept, considering centre-of-mass energies ($$\sqrt{s}$$ s ) of 250 GeV and 500 GeV with two different beam polarisation configurations of $${\mathcal {P}} (e^{-}, e^{+}) = (-\,80{\%}, +\,30{\%})$$ P ( e - , e + ) = ( - 80 % , + 30 % ) and $$(+\,80{\%}, -\,30{\%})$$ ( + 80 % , - 30 % ) . For both $$\sqrt{s}$$ s cases, the two final states $$e^{+} e^{-} \rightarrow q\overline{q}H$$ e + e - → q q ¯ H and $$e^{+} e^{-} \rightarrow \nu \overline{\nu }H$$ e + e - → ν ν ¯ H have been analyzed. For integrated luminosities of 2 $$\hbox {ab}^{-1}$$ ab - 1 at $$\sqrt{s} =250$$ s = 250 GeV and 4 $$\hbox {ab}^{-1}$$ ab - 1 at $$\sqrt{s} =500$$ s = 500 GeV, the combined precision on the branching fraction of $$H \rightarrow \mu ^{+} \mu ^{-}$$ H → μ + μ - is estimated to be 17%. The impact of the transverse momentum resolution for this analysis is also studied.
