Details

Autor(en) / Beteiligte

• Tran, T. H.
• Balagura, V.
• Boudry, V.
• Brient, J.-C.
• Videau, H.

Titel

Reconstruction and classification of tau lepton decays with ILD

Ist Teil von

• The European physical journal. C, Particles and fields, 2016-08, Vol.76 (8), p.1, Article 468

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2016

Link zum Volltext

Quelle

Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals

Beschreibungen/Notizen

• Tau lepton decays with up to two π 0 s in the final state – τ + → π + ν ¯ τ , ρ + ( π + π 0 ) ν ¯ τ , and a 1 + ( π + π 0 π 0 ) ν ¯ τ – are used to study the performance of the barrel region of the silicon-tungsten electromagnetic calorimeter (Si-W ECAL) of the International Large Detector (ILD) at the future e + e - International Linear Collider. Correct reconstruction of the tau decay mode is crucial for constraining the spin state of tau lepton and measuring the Higgs boson CP state in H → τ + τ - decays. We find that about 95 % of π + ν ¯ τ , and 90 % of ρ + ν ¯ τ and a 1 + ν ¯ τ decays produced by the e + e - → Z 0 ∗ → τ + τ - process at an e ± beam energy of 125 GeV are correctly reconstructed. In a smaller ILD detector, with the inner Si-W ECAL radius reduced by about 20 %, these efficiencies are reduced by at most 2 %. The π 0 mass resolution remains below 10 %. Since failures in tau lepton reconstruction are mainly due to photons, an increase of the ILD magnetic field from 3.5 to 4 T does not bring any significant improvement.