Fwd Underlying event and multi-parton interactions software page

Analysis Concept

The underlying event analysis constructs jets from tracks. The leading jet (i.e. the jet with largest transverse momentum) defines a direction in azimuth which is used to divide the rφ-plane in three regions: towards, away from and transverse to the leading jet. Towards and away region are dominated by the hard scattering, the transverse region gets less contribution from the hard process and can thus be used to study the underlying event. The minimal event data needed to perform the underlying event analysis are:
  • Tracks
  • Stable charged particles at hadron level, before being fed into the detector simulation
  • Charged jets, i.e. jets reconstructed from tracks
  • Charged gen jets, i.e. jets reconstructed from stable charged particles
  • High-Level-Trigger bits
  • Event scale, e.g. pt-hat in QCD 2 → 2 scatterings

After some preselections, the above event content is converted to root objects and saved to a file which is subsequently analyzed further by the macros in the Forward Physics repository (yet to be filled). More to come later.

Information on the code

Under Construction

Steps for Underlying Event Analysis

Under Construction


-- NiladriSen - 02 Jun 2009 Last reviewed by: Never reviewed

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Topic revision: r4 - 2012-01-02 - DavidDEnterria
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