Measurement of distributions sensitive to the underlying event in inclusive $Z$-boson production in pp collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector

The ATLAS collaboration
Aad, Georges , Abbott, Brad , Abbott, Dale Charles , Abdinov, Ovsat , Abed Abud, Adam , Abeling, Kira , Abhayasinghe, Deshan Kavishka , Abidi, Syed Haider , Abouzeid, Ossama , Abraham, Nicola
Eur.Phys.J.C 79 (2019) 666, 2019.

Abstract (data abstract)
This paper presents measurements of charged-particle distributions sensitive to the properties of the underlying event in events containing a Z boson decaying into a muon pair.The data were obtained using the ATLAS detector at the LHC in proton--proton collisions at a centre-of-mass energy of 13TeV with an integrated luminosity of $3.2fb^{-1}$.Distributions of the charged-particle multiplicity and of the charged-particle transverse momentum are measured in regions of the azimuth defined relative to the Z boson direction.The measured distributions are compared with the predictions of various Monte Carlo generators which implement different underlying-event models.The Monte Carlo model predictions qualitatively describe the data well, but with some significant discrepancies.

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