Energy scale and resolution for anti-$k_t$ jets with radius parameters $R=0.2$ and 0.6 measured in proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector - INSPIRE

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Energy scale and resolution for anti- $k_t$ jets with radius parameters $R=0.2$ and 0.6 measured in proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector

ATLAS

Collaboration

Dec 20, 2024

63 pages

e-Print:

2412.15783 [hep-ex]

Report number:

CERN-EP-2024-339

Experiments:

CERN-LHC-ATLAS

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Abstract: (arXiv)

Jets with different radius parameters

R

are an important tool to probe quantum chromodynamics processes at different angular scales. Jets with small

R=0.2

are instrumental in measurements of the substructure of large-

R

jets resulting from collimated hadronic decays of energetic

W

,

Z

, and Higgs bosons, top quarks, and of potential new resonances. Measurements are presented of the energy scale and resolution of jets with radius parameters

R=0.2

and 0.6 obtained with the ATLAS detector using

37 \text{fb}^{-1}

of proton--proton collisions from the Large Hadron Collider at a centre-of-mass energy of

\sqrt{s}=13

TeV, with their associated uncertainties. A new in situ method to measure jet energy scale differences between data and Monte Carlo simulations is presented. The systematic uncertainties in the jet energy scale for central jets (

|\eta| < 1.2

) typically vary from 1% to about 5% as a function of

|\eta|

at very low transverse momentum,

p_{\text{T}}

, of around 20 GeV for both

R=0.2

and 0.6 jets. The relative energy resolution ranges from

(35 \pm 6)

% at

p_{\text{T}} = 20

GeV to

(6 \pm 0.5)

% at

p_{\text{T}} = 300

GeV for central

R=0.2

jets, and is found to be slightly worse for

R=0.6

jets. Finally, the effect of close-by hadronic activity on the jet energy scale is investigated and is found to be well modelled by the ATLAS Monte Carlo simulations.

Note:

63 pages in total, author list starting page 46, 30 figures, 2 tables, submitted to Eur. Phys. J. C. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/JETM-2019-01

References(57)

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