Authors: Ghosh, D; Deb, A; Pal, S; Ghosh, J

Source: Canadian Journal of Physics, Volume 86, Number 12, December 2008 , pp. 1449-1459(11)

Publisher: NRC Research Press

Abstract:

The paper reports a study revealing self-affine fluctuations in pion, proton, and compound multiplicity (of pions combined with protons) spectra obtained from the interactions of 350 GeV pions with AgBr nuclei. The study is performed in the transformed two-dimensional phase space of the emission and azimuthal angles using the factorial moment methodology and the concept of the Hurst exponent. Evidence of a nonthermal phase transition is obtained for self-affine fluctuations of pions along with an indication for such a regime to be seen in similar fluctuations of proton and compound multiplicity distributions. The study bridges the anisotropic nature of the multiparticle production process and an evidence of the nonthermal phase transition with similar earlier findings from hadron-hadron and nucleus-nucleus interactions and shows the same effects to be peculiar features of the multiplicity distributions of the different species of particles produced. All this brings important information about the underlying dynamics of the hadroproduction process.PACS Nos.: 25.80.Hp, 24.60.Ky, 13.85.-t

Nous présentons une étude des fluctuations auto-affines dans les spectres de pions, protons et systèmes composés (des pions avec des protons) obtenues dans l'interaction de pions de 350 GeV sur des noyaux AgBr. Nous complétons cette étude en transformant l'espace de phase à deux dimensions des angles d'émission et azymutal en utilisant la méthode du moment factoriel et le concept de l'exposant de Hurst. Les résultats indiquent une transition de phase non thermique pour les fluctuations auto-affines des pions et suggèrent la même chose pour les protons et les systèmes composés. L'étude fait le pont entre la nature anisotrope des procédés de production multiparticules et l'évidence d'une transition de phase non thermique avec des résultats similaires pour des interactions hadron-hadron et noyau-noyau et montre que ces mêmes effets sont des caractéristiques particulières des distributions de multiplicité de différents types de particules produites. Tout ceci apporte un éclairage important sur la dynamique sous-jacente de production hadronique.[Traduit par la Rédaction]

Document Type: Research article

Publication date: 2008-12-01

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