Abstract
For some b-physics topics it is not enough to just tag the presence of b-quarks – it is necessary to also know whether the quark or anti-quark state is in the data. Examples include measuring the forward-backward asymmetry \(A_{\textrm{FB}}^{\textrm{b}}\) which must distinguish b- from \(\bar{\textrm{b}}\) at their point of production or measurements of neutral B-meson oscillations for which knowledge of the b-quark flavour is required at both the production and the decay time. Clearly, in order to achieve this a method that can somehow tag the quark charge must be employed. Note that this procedure is often (rather confusingly) termed ‘flavour tagging’.
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Note that with Bd 0-mesons these correlations become diluted due to \(\textrm{B}^{0} - \bar{\rm B}^{0}\) mixing which transforms a b-quark to a \(\bar{\textrm{b}}\) quark, and vice-versa, at some time between production and decay.
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Barker, G.J. (2010). Tagging b-quark Charge. In: b-Quark Physics with the LEP Collider. Springer Tracts in Modern Physics, vol 236. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-05279-8_5
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DOI: https://doi.org/10.1007/978-3-642-05279-8_5
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