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Particles and Fields


Eur. Phys. J. C 21, 23-32 (2001)
DOI: 10.1007/s100520100715

Bose-Einstein correlations in ${\mathrm K^{\pm}}{\mathrm K^{\pm}}$ pairs from Z0 decays into two hadronic jets

The OPAL Collaboration G. Abbiendi and et al.

Dipartimento di Fisica dell' Università di Bologna and INFN, 40126 Bologna, Italy

(Received: 19 November 1999 / Published online: 6 July 2001 -© Springer-Verlag / Società Italiana di Fisica 2001)

Abstract
Bose-Einstein correlations in pairs of charged kaons produced in a sample of 3.9 million hadronic Z0 decays have been measured with the OPAL experiment at LEP. Charged kaons were identified in the central tracking detector using their specific energy loss in the drift chamber gas. The correlation function was studied in two-jet events using a double ratio, formed by the number of like-sign pairs normalised by a reference sample in the data, divided by the same ratio in a Monte Carlo simulation. The enhancement at small values of the four-momentum difference of the pair was parametrised using a Gaussian function. The parameters of the Bose-Einstein correlations were measured to be $\lambda$ = $0.82 \pm 0.22^{+0.17}_{-0.12}$ for the strength and $R_0 = 0.56 \pm
0.08^{+0.08}_{-0.06}$ fm for the kaon source radius, where the first errors are statistical and the second systematic. Corrections for final-state interactions are discussed.



© Società Italiana di Fisica, Springer-Verlag 2001