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T: Fachverband Teilchenphysik

T 29: QCD mit schweren Eichbosonen 3

T 29.9: Vortrag

Freitag, 2. März 2012, 10:15–10:30, ZHG 009

Studying the Underlying Event in Z→ e⁺e⁻ using Hadron Collider Event Shapes at the LHC — •Holger Schulz¹, Gerhard Brandt², Frank Krauss³, Heiko Lacker¹, Michael Leyton¹, Martin Mamach¹, and Daniel Weyh¹ — ¹HU Berlin — ²Oxford — ³IPPP Durham

The Underlying Event (UE) is an irreducible background at any hadron collider such as the LHC. Its understanding requires phenomenological models as it cannot be calculated within perturbative QCD. Most of the activity of the UE comes from the phenomenon of multiple-parton-interactions which is studied with the analysis presented here.

A key part of this analysis is the isolation and removal of particles coming from the hard sub-process in pp → Z+X events where the Z boson is reconstructed in the e⁺e⁻ decay channel. By selecting Z bosons with very low momentum transverse to the beam axis, events with an accompanying recoil jet are efficiently suppressed. After removing of all tracks associated to the leptons from the event, various inclusive event shapes are calculated using the remaining charged particles which stem from the UE.