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Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 27: QCD I

T 27.1: Talk

Tuesday, March 16, 2021, 16:00–16:15, Tb

Measurement of inclusive jet cross-section with different size parameters at s =13 TeV in the ATLAS experiment — •Fernando Del Rio — Kirchhoff Institute for Physics

Jets are the experimental evidence of the fundamental particles governed by quantum chromodynamics (QCD), quark and gluons; their study brings valuable insight into both the physics of the Standard Model and the searches for new physics. A jet can be though in terms of a set of particles coming from a single original particle, or, in terms of measurement, a set of energy deposits in a detector. On the particle-level, the process by which a jet is formed involves hadronization, a non-perturbative phenomenon that cannot be explained from first principles. On the measurement-level a size parameter (radius or R) must be set for the anti-kt algorithm used to define jets. In the ATLAS experiments the default value for R is 0.4. In this ongoing work which uses 43  fb−1 of data from the LHC, we plan to measure the cross-section of jets that have different radii (0.2 and 0.6) to gain insight of the non-perturbative processes involved in jet formation. With this goal, in-situ calibrations have been derived for the different R, a trigger strategy has been worked out and their resolution has been determined with an in-situ method.

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