Universality of the transverse momentum distributions in the framework of percolation of strings |
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Authors: | J?Dias de Deus Email author" target="_blank">E?G?FerreiroEmail author C?Pajares R?Ugoccioni |
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Institution: | (1) Instituto Superior Técnico, CENTRA, 1049-001 Lisboa, Portugal;(2) Departamento de Física de Partículas and Instituto Galego de Física de Altas Energías, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain;(3) Dipartimento di Fisica Teorica and INFN-sezione di Torino, via P. Giuria 1, 10125 Torino, Italy |
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Abstract: | In the framework of percolation of color sources, the transverse momentum distribution in heavy ion and p + p collisions at all centralities and energies are shown to follow a universal behavior. The width of the distribution depends on the fluctuations of the number of color sources per cluster. At low densities, there are only independent single color sources, no fluctuations occur and the distribution is described by a single exponential. At very high densities, only one cluster of many color sources appears and therefore there are not fluctuations either and the hardness of the distribution is suppressed. The Cronin effect in this framework is due to a maximum of the fluctuations which decreases as the density increases. We obtain a good agreement with experimental data including the low p
T behavior and the spectra for different particles. We show that the transverse momentum and multiplicity distributions are related to each other in a defined way. This point is satisfied by the experimental data on p + p collisions at different energies.Received: 15 July 2004, Revised: 17 December 2004, Published online: 15 February 2005 |
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