Issues in jet physics:Session I
G. Salam and M. Wobisch(Conveners)

   The topics that will be addressed by the working group will be

• Identification and study of benchmark channels, such as dijet events, ttbar, Zprime, W+jets, boosted heavy-particle decays, and some BSM processes.
• Quantitative measures of jet finder performance and robustness, dependence (e.g.) on Pt, and related optimizations
• Theoretical aspects of jet finders: IR and collinear safety properties of current algorithms, proposals of new algorithms, new ways of using existing algorithms
• Impact of non-perturbative contributions to jets (hadronisation, underlying event, pileup) and correction methods.
• Lessons from jet-finding at the Tevatron
• Detector related jet issues: ATLAS/CMS comparison (particle and detector level, with or without magnetic field), independence of results on detector geometry.
• Provide some event-by-event comparison between algorithms to illustrate what we've learnt from the above quantitative studies.
• Flavour of jets (both heavy-flavour and light-quark v. gluon), examining theoretical techniques and experimental feasibility.

The aim of these studies is to reach a "Les Houches proposal" for jet-finding at the LHC. It should balance performance, robustness and flexibility across the range of benchmark channels, with perhaps different jet-finding solutions according to the particular task.

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