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# Reconstruction and classification of tau lepton decays with ILD

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### Abstract

Tau-lepton decays with up to two $$\pi^0$$'s in the final state, $$\tau^+ \to \pi^+ \bar{\nu}_\tau$$, $$\rho^+ (\pi^+\pi^0) \bar{\nu}_\tau$$, $$a^+_1 (\pi^+\pi^0\pi^0) \bar{\nu}_\tau$$, are used to study the performance of the barrel part of the silicon-tungsten electromagnetic calorimeter (Si-W ECAL) of the International Large Detector (ILD) at the future $$e^+-e^-$$ International Linear Collider. A correct reconstruction of the tau decay mode is crucial for constraining the tau spin state and measuring the Higgs boson CP state in $$H\to \tau^+\tau^-$$ decays. About 95% of $$\pi^+ \bar{\nu}_\tau$$ and 90% of $$\rho^+\bar{\nu}_\tau$$ and $$a^+_1\bar{\nu}_\tau$$ decays from $$e^+e^-\to Z^0\to \tau^+\tau^-$$ reaction at $$e^\pm$$-beam energy of 125 GeV are correctly reconstructed. In a smaller ILD detector, with Si-W ECAL radius reduced by about 20% these numbers degrade by at most 2%. The $$\pi^0$$ mass resolution stays below 10%. Since the failures in the tau-lepton reconstruction are mainly due to photons, the increase of the ILD magnetic field from 3.5 T to 4 T does not bring any significant improvement.

### Author and article information

###### Journal
2015-10-18
2016-03-25
1510.05224