Measurement of the angle between jet axes in pp collisions at s√ = 5.02 TeV
ALICE Collaboration. (2023). Measurement of the angle between jet axes in pp collisions at s√ = 5.02 TeV. Journal of High Energy Physics, 2023, Article 201. https://doi.org/10.1007/JHEP07(2023)201
Published inJournal of High Energy Physics
© CERN, for the benefit of the ALICE Collaboration. Article funded by SCOAP3.
This article reports measurements of the angle between differently defined jet axes in pp collisions at √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, ∆Raxis, probes a wide phase space of the jet formation and evolution, ranging from the initial high-momentum-transfer scattering to the hadronization process. The ∆Raxis observable is presented for 20 < pTch 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. ...
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Related funder(s)Academy of Finland; European Commission
Funding program(s)Centre of Excellence, AoF
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
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