Friday April 30, 14:30 - IFAE seminar room

Speaker: Gregory Soyez (CERN, Geneva)

Jets, naively seen as collimated bunches of particles, are very useful tools at hadronic colliders. The major part of the talk will tackle a basic question: how can we define the jets from the particles in an event? In that perspective, I will review the definitions used over the last decades and show that

fundamental theoretical issues led to the introduction of new algorithm. I will also discuss the practical implications of these new algorithms, especially at the LHC. In the second part of the talk, I will discuss how one can optimise the choice of the jet definition in the simple case of dijet kinematical reconstruction. I will first concentrate on the result obtained through Monte-Carlo simulations, then show that analytic predictions are possible.


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