Kinematic reconstruction of $Z/H \rightarrow \tau\tau$ decay in proton-proton collisions

Abstract : The knowledge of $\tau$ lepton kinematic and kinematic of the $\tau$ pair in the decay $Z/H \rightarrow \tau\tau$ is essential for various analysis at LHC. However, the reconstruction of the whole kinematic of the $\tau$ decay is a challenging task, since in every $\tau$ decay at least one neutrino is present in the final state which escapes detection. In this paper a kinematic technique (Global Event Fit) to estimate the momentum escaped with neutrinos and hence the full momentum of the $\tau$ lepton pair is described. The algorithm is based on iterative minimization of the likelihood with constrains derived from all available kinematic information on the decay. The method requires the direction of at least one $\tau$ lepton to be well defined and therefore the method can be applied to the decays $Z/H \rightarrow \tau\tau \rightarrow X + a_{1}\nu$ with $a_{1}$ resonance decaying into three charged pions.
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Soumis le : lundi 4 juin 2018 - 12:11:10
Dernière modification le : mercredi 13 février 2019 - 04:14:02

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Vladimir Cherepanov, Alexander Zotz. Kinematic reconstruction of $Z/H \rightarrow \tau\tau$ decay in proton-proton collisions. 2018. 〈hal-01806984〉



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