Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 28: Top quarks: mass and jets

T 28.4: Talk

Tuesday, March 31, 2020, 17:45–18:00, H-HS XI

Determination of the jet energy scale and jet momentum resolution at the CMS experiment using Z+jet events — Tabea Feßenbecker, •Christoph Heidecker, Günter Quast, Klaus Rabbertz, and Daniel Savoiu — Karlsruhe Institute of Technology

Accurately measured jets are mandatory for precision measurements of the Standard Model of particle physics as well as for searches for new physics. The increased instantaneous luminosity and center-of-mass energy at LHC Run 2 poses challenges for pileup mitigation and for the measurement of jet characteristics.

At CMS, jets are calibrated using a multi-stage approach in order to correct for effects of pileup, uniformity of the detector response, and residual differences between data and simulation.

A well-established calibration approach to extract residual corrections is based on balancing a jet against a precisely reconstructed Z boson. In this contribution we summarize how Z(→µµ/ee)+jets events are used in CMS to derive data-based corrections to the jet energy scale. Furthermore, we demonstrate that the same Z+jet balancing approach can also be used to adjust the jet momentum resolution in simulation to that in data.