Estimation of hydrodynamical model parameters from the invariant spectrum and the Bose-Einstein correlations of π- mesons produced in (π++) p interactions at 250 GeV/c

N. M. Agababyan*, M. R. Atayan, T. Csörgo, E. A. De Wolf, K. Dziunikowska, A. M F Endler, Z. Sh Garutchava, H. R. Gulkanyan, R. Sh Hakobyan, J. K. Karamyan, D. Kisielewska, W. Kittel, S. S. Mehrabyan, Z. V. Metreveli, K. Olkiewicz, F. K. Rizatdinova, E. K. Shabalina, L. N. Smirnova, M. D. Tabidze, L. A. TikhonovaA. V. Tkabladze, A. G. Tomaradze, F. Verbeure, S. A. Zotkin

*Corresponding author for this work

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Abstract

The invariant spectra of π- mesons produced in (π++)p interactions at 250 GeV / c are analysed in the framework of the hydrodynamical model of three-dimensionally expanding cylindrically symmetric finite systems. A satisfactory description of experimental data is achieved. The data favour the pattern according to which the hadron matter undergoes predominantly longitudinal expansion and non-relativistic transverse expansion with mean transverse velocity 〈ut〉 = 0.20 ± 0.07, and is characterized by a large temperature inhomogeneity in the transverse direction: the extracted freeze-out temperature at the center of the tube and at the transverse rms radius are 140 ± 3 MeV and 82 ± 7 MeV, respectively. The width of the (longitudinal) space-time rapidity distribution of the pion source is found to be Δn = 1.36 ± 0.02. Combining this estimate with results of the Bose-Einstein correlation analysis in the same experiment, one extracts a mean freeze-out time of the source of (τf) = 1.4 ± 0.1 fm/c and its transverse geometrical rms radius, RG(rms) = 1.2 ± 0.2 fm.

Original languageEnglish (US)
Pages (from-to)359-368
Number of pages10
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume422
Issue number1-4
DOIs
StatePublished - Mar 12 1998

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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