Prospects of measuring the branching fraction of the Higgs boson decaying into muon pairs at the International Linear Collider
2020
The prospects for measuring the branching fraction of $$H \rightarrow \mu ^{+} \mu ^{-}$$
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 (
$$\sqrt{s}$$
) of 250 GeV and 500 GeV with two different beam polarisation configurations of $${\mathcal {P}} (e^{-}, e^{+}) = (-\,80{\%}, +\,30{\%})$$
and $$(+\,80{\%}, -\,30{\%})$$
. For both $$\sqrt{s}$$
cases, the two final states $$e^{+} e^{-} \rightarrow q\overline{q}H$$
and $$e^{+} e^{-} \rightarrow \nu \overline{\nu }H$$
have been analyzed. For integrated luminosities of 2 $$\hbox {ab}^{-1}$$
at $$\sqrt{s} =250$$
GeV and 4 $$\hbox {ab}^{-1}$$
at $$\sqrt{s} =500$$
GeV, the combined precision on the branching fraction of $$H \rightarrow \mu ^{+} \mu ^{-}$$
is estimated to be 17%. The impact of the transverse momentum resolution for this analysis is also studied.
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