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A search for flavour-changing neutral currents in b decay at petra

Research output: Contribution to journalJournal article


Journal publication date1983
JournalPhysics Letters B
Number of pages5
Original languageEnglish


A study of the reaction e+e− → μ+μ−+ anything at a mean centre of mass energy of ≈35 GeV has been carried out to investigate the possible flavour-changing neutral current decay of the b quark. An upper limit of 0.7% at 95% CL has been placed on the branching ratio for this process. This limit conflicts with the predictions of a five-quark model (without top) which assigns the b quark to left- and right-handed singlets.