Reduction of Statistical Power Per Event Due to Upper Lifetime Cuts in Lifetime Measurements

Details Reduction of Statistical Power Per Event Due to Upper Lifetime Cuts in Lifetime Measurements Reduction of Statistical Power Per Event Due to Upper Lifetime Cuts in Lifetime Measurements

2005-02-25

arxiv.org/abs/hep-ex/0502042v3

Nucl.Instrum.Meth.A570:525-528,2007

Physics

High Energy Physics

High Energy Physics - Experiment

Changes to latest revision: added DOI link, took the opportunity to correct some minor typos added one small clarification

Scientific paper

10.1016/j.nima.2006.09.090

A cut on the maximum lifetime in a lifetime fit not only reduces the number of events, but also, in some circumstances dramatically, decreases the statistical significance of each event. The upper impact parameter cut in the hadronic B trigger at CDF, which is due to technical limitations, has the same effect. In this note we describe and quantify the consequences of such a cut on lifetime measurements. We find that even moderate upper lifetime cuts, leaving event numbers nearly unchanged, can dramatically increase the statistical uncertainty of the fit result.

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