Abstract

Jets represent a long withstanding challenge for both theoretical and experimental physics. Because of their composite nature, they necessitate of a clustering algorithm to be defined, and their interaction with the detector will vary significantly on a jet-by-jet basis, depending each jet’s composition. The instrinsic difficulty in experimentally determining a jet’s particle composition translates in an uncertainty on the measurement of the jet’s energy scale, and therefore in the necessity of additional calibration procedures, specific for jets. In the first part of this chapter we will describe the jet energy scale problematic, and explain the related challenges from an experimental point of view. We will show how sophisticated jet reconstruction techniques, such as the CMS full event reconstruction known as the Particle Flow, may significantly improve jet reconstruction performance. Section 3.3 is dedicated to illustrating the jet calibration scheme employed in CMS, and showing the results on the measurement of the jet energy scale and resolution in proton-proton collisions. Finally, Sect. 3.5 demonstrates how detailed information on jet particle composition can give insight on the nature of the parton originating the jet.

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