Measurement of the $k_{\mathrm{t}}$ splitting scales in $Z\to \ell \ell$ events in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector

Abstract

A measurement of the splitting scales occuring in the $k_{\mathrm{t}}$ jet-clustering algorithm is presented for final states containing a $Z$ boson. The measurement is done using 20.2 fb${}^{-1}$ of proton-proton collision data collected at a centre-of-mass energy of $\sqrt{s}=8$ TeV by the ATLAS experiment at the LHC in 2012. The measurement is based on charged-particle track information, which is measured with excellent precision in the $p_{\mathrm{T}}$ region relevant for the transition between the perturbative and the non-perturbative regimes. The data distributions are corrected for detector effects, and are found to deviate from state-of-the-art predictions in various regions of the observables.

42 pages in total, author list starting page 26, 8 figures, 1 table, published in JHEP, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2015-14/

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• New sensitivity of current LHC measurements to vector-like quarks
• A simultaneous unbinned differential cross section measurement of twenty-four $Z$+jets kinematic observables with the ATLAS detector
• Vector Bosons and Jets in Proton Collisions
• Production of electroweak bosons in association with jets with the ATLAS detector
• Production of vector bosons in association with jets in ATLAS