Full Simulation Study of the Higgs Branching Ratio into Tau Lepton Pairs at the ILC with $\sqrt{s}=500$ GeV

Abstract

We evaluate the expected measurement accuracy of the branching ratio of the Standard Model Higgs boson decaying into tau lepton pairs $h\to {\tau }^{+}{\tau }^{-}$ at the ILC with a center-of-mass energy of $\sqrt{s}=500$ GeV with a full simulation of the ILD detector. We assume a Higgs mass of $M_h=125$ GeV, a branching ratio of $\mathrm{BR}(h\to {\tau }^{+}{\tau }^{-})=6.32\%$, beam polarizations of $P(e^{+},e^{-})=(-0.8,+0.3)$, and an integrated luminosity of $\int Ldt=500\mathrm{f}{\mathrm{b}}^{-1}$. The Higgs-strahlung process $e^{+}{e}^{-}\to Zh$ with $Z\to q\overline{q}$ and the $WW$-fusion process $e^{+}{e}^{-}\to \nu \overline{\nu }h$ are expected to be the most sensitive channels at $\sqrt{s}=500$ GeV. Using a multivariate analysis technique, we estimate the expected relative measurement accuracy of the branching ratio $\Delta (\sigma \cdot \mathrm{BR})/(\sigma \cdot \mathrm{BR})$ to be 4.7% and 7.4% for the $q\overline{q}h$ and $\nu \overline{\nu }h$ final states, respectively. The results are cross-checked using a cut-based analysis.

6 pages, 6 figures, 1 table. Talk presented at the International Workshop on Future Linear Colliders (LCWS13), Tokyo, Japan, 11-15 November 2013

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