Measurement of the energy response of the ATLAS calorimeter to charged pions from $W^{\pm }\rightarrow \tau ^{\pm }(\rightarrow \pi ^{\pm }\nu _{\tau })\nu _{\tau }$ events in Run 2 data - INSPIRE

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Measurement of the energy response of the ATLAS calorimeter to charged pions from $W^{\pm }\rightarrow \tau ^{\pm }(\rightarrow \pi ^{\pm }\nu _{\tau })\nu _{\tau }$ events in Run 2 data

ATLAS

Collaboration

Aug 20, 2021

43 pages

Published in:

Eur.Phys.J.C 82 (2022) 3, 223

Published: Mar 14, 2022

e-Print:

2108.09043 [hep-ex]

DOI:

10.1140/epjc/s10052-022-10117-2

Report number:

CERN-EP-2021-147

Experiments:

CERN-LHC-ATLAS

View in:

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Abstract: (Springer)

The energy response of the ATLAS calorimeter is measured for single charged pions with transverse momentum in the range

10<p_\text {T}<300

GeV. The measurement is performed using 139

\text {fb}^{-1}

of LHC proton–proton collision data at

\sqrt{s}=13

TeV taken in Run 2 by the ATLAS detector. Charged pions originating from

\tau

-lepton decays are used to provide a sample of high-

p_{\text {T}}

isolated particles, where the composition is known, to test an energy regime that has not previously been probed by in situ single-particle measurements. The calorimeter response to single-pions is observed to be overestimated by

{\sim }2\%

across a large part of the

p_{\text {T}}

spectrum in the central region and underestimated by

{\sim }4\%

in the endcaps in the ATLAS simulation. The uncertainties in the measurements are

{\lesssim }1\%

for

15<p_\text {T}<185

GeV in the central region. To investigate the source of the discrepancies, the width of the distribution of the ratio of calorimeter energy to track momentum, the energies per layer and response in the hadronic calorimeter are also compared between data and simulation.

Note:

43 pages in total, author list starting page 27, 11 figures, 0 tables, 6 aux figures. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/JETM-2018-08

p p: scattering
p p: colliding beams
W: leptonic decay
tau: hadronic decay
calorimeter: hadronic
ATLAS
central region
CERN LHC Coll
transverse momentum
tracks

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