Search For Baryon And Lepton Number Violating Z(0) Decays

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PHYSICS LETTERS B（1999）

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Abstract

Using data collected with the OPAL detector at LEP, we have searched for the processes e(+)e(-) --> Z(0) --> pe(-),p mu(-) and the charge conjugate final-states. These would violate the conservation of the baryon-number B, lepton-number L and the fermion-number n = (B + L). No evidence for such decays has been found, and the 95% confidence level upper limits on the partial widths Gamma(Z(0) --> pe) and Gamma(Z(0) --> p mu) are found to be 4.6 and 4.4 keV respectively. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

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Key words

lepton number,baryon

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