Underlying-event properties in pp and p–Pb collisions at √sNN = 5.02 TeV
We report about the properties of the underlying event measured with ALICE at the LHC in pp and p–Pb collisions at √ sNN = 5.02 TeV. The event activity, quantified by charged-particle number and summed-pT densities, is measured as a function of the leading particle transverse momentum (p trig T ). T...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2023 |
| País: | Brasil |
| Institución: | Universidade Federal do Rio Grande do Sul (UFRGS) |
| Repositorio: | Repositório Institucional da UFRGS |
| Idioma: | inglés |
| OAI Identifier: | oai:www.lume.ufrgs.br:10183/268508 |
| Acceso en línea: | http://hdl.handle.net/10183/268508 |
| Access Level: | acceso abierto |
| Palabra clave: | Aceleradores de partículas Colisões proton-proton Colisao de ions pesados Properties of hadrons Quark-Gluon Plasma |
| Sumario: | We report about the properties of the underlying event measured with ALICE at the LHC in pp and p–Pb collisions at √ sNN = 5.02 TeV. The event activity, quantified by charged-particle number and summed-pT densities, is measured as a function of the leading particle transverse momentum (p trig T ). These quantities are studied in three azimuthal angle regions relative to the leading particle in the event: toward, away, and transverse. Results are presented for three different pT thresholds (0.15, 0.5 and 1 GeV/c) at mid pseudorapidity (|η| < 0.8). The event activity in the transverse region, which is the most sensitive to the underlying event, exhibits similar behaviour in both pp and p–Pb collisions, namely, a steep increase with p trig T for low p trig T , followed by a saturation at p trig T ≈ 5 GeV/c. The results from pp collisions are compared with existing measurements at other centre-of mass energies. The quantities in the toward and away regions are also analyzed after the subtraction of the contribution measured in the transverse region. The remaining jet-like particle densities are consistent in pp and p–Pb collisions for p trig T > 10 GeV/c, whereas for lower p trig T values the event activity is slightly higher in p–Pb than in pp collisions. The measurements are compared with predictions from the PYTHIA 8 and EPOS LHC Monte Carlo event generators. |
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