Observations of π-B charge-flavor correlations and resonant Bπ and BK production

The OPAL Collaboration

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113 Scopus citations


Evidence is presented for kinematic and charge correlations of B mesons with charged pions and kaons. Using a new technique, a sample of over 80 000 partially reconstructed B mesons is obtained in 3.5·106 hadronic Z0 decays recorded using the OPAL detector at LEP. The invariant mass distributions of B+π- and B+K- combinations show enhancements consistent with the decays of P-wave resonances of a b antiquark and a light quark. We observe an excess of 1738±195 B+π- pairs with invariant masses in the range 5.60-5.85 GeV and an excess of 149±31 B+K- pairs with invariant masses in the range 5.80-6.00 GeV. Labeling the observed enhancements generically as B** we find {Mathematical expression} where B(*)+ indicates the sum of B+ and B*+ and the errors include statistical and systematic contributions. From a study of π-B charge-flavor correlations we conclude that the production flavor of a B meson can be tagged with the charge of a pion in an appropriately chosen kinematic region, and that the performance of this flavor tag compares favorably in the {Mathematical expression} environment with lepton-based tags.

Original languageEnglish
Pages (from-to)19-29
Number of pages11
JournalEuropean Physical Journal C
Issue number1-2
StatePublished - 1 Jan 1995
Externally publishedYes

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)


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