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T: Fachverband Teilchenphysik

T 138: QCD Experiment III

T 138.1: Talk

Thursday, March 23, 2023, 17:30–17:45, HSZ/0405

Triple differential cross-section measurement of Z(µµ)+jet events at 13 TeV — •Cedric Verstege, Robin Hofsaess, Maximilian Horzela, Günter Quast, and Klaus Rabbertz — Karlsruhe Institute of Technology, Karlsruhe, Germany

The differential cross-sections of Z(µµ)+jet events is presented using the data recorded at 13 TeV center-of-mass energy by the CMS experiment in the years 2016, 2017, and 2018. The cross-sections are measured as a function of the Z boson transverse momentum p_T^Z, the rapidity separation y^* of the Z boson and the leading jet, and the boost in rapidity y_b of their center-of-mass system in the lab frame. The observables y^* and y_b enhance the sensitivity to different parton initial-state and momentum contributions, and thus to the PDFs.

The measured cross-sections are unfolded for detector effects in all three dimensions simultaneously. The resulting cross-sections at stable particle level are compared to precise theory predictions calculated at next-to-next-to-leading order in perturbative QCD corrected for electroweak and non-perturbative effects.