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Evidence for b baryons in Z decays

Research output: Contribution to journalJournal article

Published

Journal publication date1992
JournalPhysics Letters B
Journal number1-2
Volume278
Number of pages8
Pages209-216
Original languageEnglish

Abstract

In 160 000 hadronic Z decays recorded with the ALEPH detector at LEP, the yields of Λℓ− and Λℓ+ combinations have been measured. The observed excess of Λℓ− over Λℓ+ of 53±13 is interpreted as evidence for b baryons and their semileptonic decay. Assuming that three body decay processes such as dominate the semileptonic decay of b baryons, this ex cess corresponds to a product branching ratio , where ΛbandΛc+ denote the bottom and charm baryons respectively.