Final state interactions for Bose-Einstein correlations in S+Pb $\to$ $π^+$$π^+$ +X reaction at energy 200GeV/nucleon

T. Osada; S. Sano; M. Biyajima; G. Wilk

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arXiv · hep-ph/9606367

Final state interactions for Bose-Einstein correlations in S+Pb $\to$ $π^+$$π^+$ +X reaction at energy 200GeV/nucleon

T. Osada·S. Sano·M. Biyajima·G. Wilk

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Abstract

We applied an analytical formula for Bose-Einstein correlations (BEC) developed by us recently to high-energy heavy ion collisions, in particular to data on S+Pb$\toπ^+$-$π^+$+X reaction at energy $200$ GeV/nucleon reported by the NA44 Collaboration. It takes into account both Coulomb and strong ($π$-$π$~s-wave; I=2) final state interactions (FSI). We have found that inclusion of the strong interaction in addition to Coulomb correction affects significantly the extracted parameters of the BEC like the source size $R$, the degree of coherence $λ$ and the long-range correlation parameter $γ$. In particular, the $λ$ parameter of the BEC is increased by about 20\%. Our results differ from those obtained in $e^+e^-$ annihilation in the following way: the $λ$ parameter does not reach `chaotic limit' and the $γ$ parameter does not approach to zero.

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T. Osada, S. Sano, M. Biyajima, G. Wilk. 1996-06-19. Final state interactions for Bose-Einstein correlations in S+Pb $\to$ $π^+$$π^+$ +X reaction at energy 200GeV/nucleon. https://arxiv.org/abs/hep-ph/9606367

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