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

Aad, Georges; Abbott, Brad; Abbott, Dale Charles; Abdinov, Ovsat; Abed Abud, Adam; Abeling, Kira; Abhayasinghe, Deshan Kavishka; Abidi, Syed Haider; Abouzeid, Ossama; Abraham, Nicola

doi:10.1140/epjc/s10052-019-7162-0

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

ATLAS

Collaboration

May 23, 2019

44 pages

Published in:

Eur.Phys.J.C 79 (2019) 8, 666

Published: Aug 8, 2019

e-Print:

1905.09752 [hep-ex]

DOI:

10.1140/epjc/s10052-019-7162-0 (publication)

Report number:

CERN-EP-2019-064

Experiments:

CERN-LHC-ATLAS

View in:

datasets

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Abstract: (Springer)

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 13

\text {Te}\text {V}

with an integrated luminosity of

3.2~\text{ fb }^{-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 underyling event models. The Monte Carlo model predictions qualitatively describe the data well, but with some significant discrepancies.

Note:

44 pages in total, author list starting on page 28, 14 figures, 1 table, submitted to Eur. Phys. J. C. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2017-28/

p p: scattering
p p: colliding beams
charged particle: transverse momentum
charged particle: multiplicity
transverse momentum: momentum spectrum
multiplicity: spectrum
Z0: leptonic decay
muon: pair production
underlying event
numerical calculations: Monte Carlo

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