Central Pb+Pb collisions at 158 A GeV/c studied by $\pi^-\pi^-$ interferometry

The WA98 Collaboration:     M.M. Aggarwal - et al.

doi:doi:10.1007/s100520000413

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Central Pb+Pb collisions at 158 A GeV/c studied by $\pi^-\pi^-$ interferometry

The WA98 Collaboration
M.M. Aggarwal¹ - et al.

¹ University of Panjab, Chandigarh 160014, India

Abstract
Two-particle correlations have been measured for identified $\pi^-$ from central 158 A GeV Pb+Pb collisions and fitted radii of about 7 fm in all dimensions have been obtained. A multi-dimensional study of the radii as a function of k_T is presented, including a full correction for the resolution effects of the apparatus. The cross term R²_out-long of the standard fit in the Longitudinally CoMoving System (LCMS) and the v_L parameter of the generalised Yano-Koonin fit are compatible with 0, suggesting that the source undergoes a boost invariant expansion.
The shapes of the correlation functions in Q_inv and $Q_{space}=\sqrt{Q^2_x+Q^2_y+Q^2_z}$ have been analyzed in detail. They are not Gaussian but better represented by exponentials. As a consequence, fitting Gaussians to these correlation functions may produce different radii depending on the acceptance of the experimental setup used for the measurement.

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Central Pb+Pb collisions at 158 A GeV/c studied by interferometry

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Central Pb+Pb collisions at 158 A GeV/c studied by $\pi^-\pi^-$ interferometry