Measurements of the groomed and ungroomed jet angularities in pp collisions at √s = 5.02 TeV

0557743 - ÚJF 2023 RIV US eng J - Článek v odborném periodiku
Acharya, S. - Adamová, Dagmar - Adler, A. - Aglieri Rinella, G. - Bielčík, J. - Bielčíková, Jana - Broz, M. - Contreras, J. G. - Herman, T. - Horák, D. - Isakov, Artem - Kotliarov, Artem - Křížek, Filip - Křížková Gajdošová, K. - Kushpil, Svetlana - Lavička, R. - Mareš, Jiří A. - Petráček, V. - Šafařík, K. - Šumbera, Michal - Torres, S. R. - Trzeciak, B. A. - Závada, Petr … celkem 1021 autorů
Measurements of the groomed and ungroomed jet angularities in pp collisions at √s = 5.02 TeV.
Journal of High Energy Physics. Roč. 2022, č. 5 (2022), č. článku 061. ISSN 1029-8479. E-ISSN 1029-8479
Grant CEP: GA MŠMT(CZ) LTT17018
Výzkumná infrastruktura: CERN-CZ II - 90104
Institucionální podpora: RVO:68378271 ; RVO:61389005
Klíčová slova: ALICE collaboration * heavy ion experiments
Obor OECD: Nuclear physics; Particles and field physics (FZU-D)
Impakt faktor: 5.4, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1007/JHEP05(2022)061

The jet angularities are a class of jet substructure observables which characterize the angular and momentum distribution of particles within jets. These observables are sensitive to momentum scales ranging from perturbative hard scatterings to nonperturbative fragmentation into final-state hadrons. We report measurements of several groomed and ungroomed jet angularities in pp collisions at root s = 5.02 TeV with the ALICE detector. Jets are reconstructed using charged particle tracks at midrapidity (vertical bar eta vertical bar< 0.9). The anti-k(T) algorithm is used with jet resolution parameters R = 0.2 and R = 0.4 for several transverse momentum p(T)(ch jet) intervals in the 20-100 GeV/c range. Using the jet grooming algorithm Soft Drop, the sensitivity to softer, wide-angle processes, as well as the underlying event, can be reduced in a way which is well-controlled in theoretical calculations. We report the ungroomed jet angularities, lambda(alpha), and groomed jet angularities, lambda(alpha,g), to investigate the interplay between perturbative and nonperturbative effects at low jet momenta. Various angular exponent parameters alpha = 1, 1.5, 2, and 3 are used to systematically vary the sensitivity of the observable to collinear and soft radiation. Results are compared to analytical predictions at next-to-leading-logarithmic accuracy, which provide a generally good description of the data in the perturbative regime but exhibit discrepancies in the nonperturbative regime. Moreover, these measurements serve as a baseline for future ones in heavy-ion collisions by providing new insight into the interplay between perturbative and nonperturbative effects in the angular and momentum substructure of jets. They supply crucial guidance on the selection of jet resolution parameter, jet transverse momentum, and angular scaling variable for jet quenching studies.
Trvalý link: http://hdl.handle.net/11104/0331664