Differential cross-section measurements for the electroweak production of dijets in association with a $Z$ boson in proton–proton collisions at ATLAS - INSPIRE

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Differential cross-section measurements for the electroweak production of dijets in association with a $Z$ boson in proton–proton collisions at ATLAS

ATLAS

Collaboration

Jun 27, 2020

55 pages

Published in:

Eur.Phys.J.C 81 (2021) 2, 163

Published: Feb 17, 2021

e-Print:

2006.15458 [hep-ex]

DOI:

10.1140/epjc/s10052-020-08734-w (publication)

PDG:

{{\mathit c}_{{{{WWW}}}}}/\Lambda {}^{2}

{{\mathit c}_{{{{W}}}}}/\Lambda {}^{2}

{{\mathit c}_{{{{B}}}}}/\Lambda {}^{2}

Report number:

CERN-EP-2020-045

Experiments:

CERN-LHC-ATLAS

View in:

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Abstract: (Springer)

Differential cross-section measurements are presented for the electroweak production of two jets in association with a Z boson. These measurements are sensitive to the vector-boson fusion production mechanism and provide a fundamental test of the gauge structure of the Standard Model. The analysis is performed using proton–proton collision data collected by ATLAS at

\sqrt{s}=13\ \hbox {TeV}

and with an integrated luminosity of

139\ \hbox {fb}^{-1}

. The differential cross-sections are measured in the

Z\rightarrow \ell ^+\ell ^-

decay channel (

\ell =e,\mu

) as a function of four observables: the dijet invariant mass, the rapidity interval spanned by the two jets, the signed azimuthal angle between the two jets, and the transverse momentum of the dilepton pair. The data are corrected for the effects of detector inefficiency and resolution and are sufficiently precise to distinguish between different state-of-the-art theoretical predictions calculated using Powheg+Pythia8, Herwig7+Vbfnlo and Sherpa 2.2. The differential cross-sections are used to search for anomalous weak-boson self-interactions using a dimension-six effective field theory. The measurement of the signed azimuthal angle between the two jets is found to be particularly sensitive to the interference between the Standard Model and dimension-six scattering amplitudes and provides a direct test of charge-conjugation and parity invariance in the weak-boson self-interactions.

Note:

55 pages in total, author list starting page 39, 12 figures, 8 tables, published in EPJ C 81 (2021) 163. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2017-27

p p: scattering
p p: colliding beams
jet: hadroproduction
jet: pair production
Z0: associated production
Z0: leptonic decay
electron: pair production
muon: pair production
vector boson: fusion
dijet: hadroproduction

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