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Non-Gaussian transverse momentum fluctuations from impact parameter fluctuations

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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