A Study of Bose-Einstein correlations in e+ e- annihilations at LEP

Acton, P.D.; Alexander, G.; Allison, J.; Allport, P.P.; Anderson, K.J.; Arcelli, S.; Armitage, J.C.; Ashton, P.; Astbury, A.; Axen, D.

doi:10.1016/0370-2693(91)90540-7

A Study of Bose-Einstein correlations in e+ e- annihilations at LEP

OPAL

Collaboration

•

P.D. Acton
(
- Brunel U.
)

Jul, 1991

11 pages

Published in:

Phys.Lett.B 267 (1991) 143-153

Published: 1991

DOI:

10.1016/0370-2693(91)90540-7

Report number:

CERN-PPE-91-110

Experiments:

CERN-LEP-OPAL

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Abstract: (Elsevier)

Bose-Einstein correlations between like-sign charged track pairs have been studied in e + e − annihilation hadronic events at centre-of-mass energies around the Z 0 peak as a function of Q , the four-momentum difference of the pair. The measurement was performed with the OPAL detector at LEP. Assuming the charged tracks to be pions, the observed Bose-Einstein enhancement was used to extract the values of the strength of the effect and the radius of the pion emitting source, which were found to be λ =0.866±0.032±0.140 and R 0 =0.928±0.019±0.150 fm, respectively, where the first error is statistical and the second is systematic. The results do not show significant variation in comparison to e + e − annihilation measurements at lower centre-of-mass energies. If non-pion track contamination is taken into account, the value of the strength λ becomes consistent with unity.

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
Z0: electroproduction
electroproduction: Z0
Z0: nonleptonic decay
nonleptonic decay: Z0
hadron: multiple production
multiple production: hadron

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