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Production of orbitally excited charm mesons in semileptonic B decays

Research output: Contribution to journalJournal article

Published

Journal publication date1997
JournalZeitschrift für Physik C: Particles and Fields
Journal number4
Volume73
Number of pages12
Pages601-612
Original languageEnglish

Abstract

A sample of 3.6 million hadronic Z decays recorded between 1991 and 1995 with the ALEPH detector at LEP is used to investigate semileptonic decays of B mesons into final states involving orbitally excited charm mesons. Topological vertex criteria are used to search for decays involving narrow D** states as well as wide D** resonances and non-resonant D(*)pi final states. The sum of the branching ratios for these processes is measured to beBr((B) over bar --> D pi l(-)(v) over bar) + Br((B) over bar --> D*pi l(-)(v) over bar)= (2.26 +/-t 0.29(stat) +/- 0.33(syst))%,which accounts for a significant fraction of the deficit between inclusive measurements and the sum of exclusive semileptonic B decay modes.