Physics – Computational Physics
Scientific paper
2009-05-13
Physics
Computational Physics
10 pages, 1 figure
Scientific paper
Heavy flavour jet tagging is widely used in the determination of cross sections including the production of heavy flavoured quarks. This requires the knowledge of heavy and light flavour jet tagging efficiencies and their uncertainties. A system of eight non-linear equations can be used to determine these quantities by means of two different tagging algorithms and two data sets which differ in heavy flavour jet content. The analytical solution of this system of equations, derived by means of resultants is described in detail, including a discussion about its singularities which provide important insights, such as prescriptions to prevent badly chosen sample flavour compositions and working points of the used tagging algorithms. The analytical solution also provides an efficient and transparent way to determine the uncertainties on the solved quantities, taking correlations into account.
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