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Measurement of the angle between jet axes in pp collisions at $$ \sqrt{s} $$ = 5.02 TeV
Ist Teil von
The journal of high energy physics, 2023-07, Vol.2023 (7), Article 201
Ort / Verlag
United States: Springer
Erscheinungsjahr
2023
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
A
bstract
This article reports measurements of the angle between differently defined jet axes in pp collisions at
$$ \sqrt{s} $$
s
= 5
.
02 TeV carried out by the ALICE Collaboration. Charged particles at midrapidity are clustered into jets with resolution parameters
R
= 0
.
2 and 0.4. The jet axis, before and after Soft Drop grooming, is compared to the jet axis from the Winner-Takes-All (WTA) recombination scheme. The angle between these axes, ∆
R
axis
, probes a wide phase space of the jet formation and evolution, ranging from the initial high-momentum-transfer scattering to the hadronization process. The ∆
R
axis
observable is presented for 20
<
$$ {p}_{\textrm{T}}^{\textrm{ch}\ \textrm{jet}} $$
p
T
ch
jet
<
100 GeV/
c
, and compared to predictions from the PYTHIA 8 and Herwig 7 event generators. The distributions can also be calculated analytically with a leading hadronization correction related to the non-perturbative component of the Collins-Soper-Sterman (CSS) evolution kernel. Comparisons to analytical predictions at next-to-leading-logarithmic accuracy with leading hadronization correction implemented from experimental extractions of the CSS kernel in Drell-Yan measurements are presented. The analytical predictions describe the measured data within 20% in the perturbative regime, with surprising agreement in the non-perturbative regime as well. These results are compatible with the universality of the CSS kernel in the context of jet substructure.