| Texto completo | |
| Autor(es): |
Samanta, Rupam
;
Picchetti, Joao Paulo
;
Luzum, Matthew
;
Ollitrault, Jean-Yves
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW C; v. 108, n. 2, p. 7-pg., 2023-08-17. |
| Resumo | |
The transverse momentum per particle, [pt], fluctuates event by event in ultrarelativistic nucleus-nucleus collisions, for a given multiplicity. These fluctuations are small and approximately Gaussian, but a nonzero skewness has been predicted on the basis of hydrodynamic calculations, and seen experimentally. We argue that the mechanism driving the skewness is that, if the system thermalizes, the mean transverse momentum increases with impact parameter for a fixed collision multiplicity. We postulate that fluctuations are Gaussian at fixed impact parameter, and that non-Gaussianities solely result from impact parameter fluctuations. Using recent data on the variance of [pt] fluctuations, we make quantitative predictions for their skewness and kurtosis as a function of the collision multiplicity. We predict, in particular, a spectacular increase of the skewness below the knee of the multiplicity distribution, followed by a fast decrease. (AU) | |
| Processo FAPESP: | 18/24720-6 - Exploração do diagrama de fase da QCD |
| Beneficiário: | Frédérique Marie Brigitte Sylvie Grassi |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 21/08465-9 - Dinâmica inicial de colisões nucleares ultrarelativísticas do momento transversal final |
| Beneficiário: | Matthew William Luzum |
| Modalidade de apoio: | Bolsas no Exterior - Pesquisa |
| Processo FAPESP: | 17/05685-2 - Física hadrônica em colisões nucleares de altas energias |
| Beneficiário: | Jun Takahashi |
| Modalidade de apoio: | Auxílio à Pesquisa - Projetos Especiais |