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{\Large\bf
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Properties of robust vertex fitting algorithms at high luminosity HEP experiments
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J.~D'Hondt$^{a}$, R.~Fr\"uhwirth$^{b}$, S.~Tavernier$^{a}$, P.~Vanlaer$^{c}$ and W.~Waltenberger$^{b}$ \\

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$^{(a)}$ Vrije Universiteit Brussel,Pleinlaan 2, B-1050 Brussels, Belgium \\
$^{(b)}$ Universit\"at Wien, Nikolsdorfer Gasse 18, A-1050 Vienna, Austria \\
$^{(c)}$ Universit\'e Libre de Bruxelles, Boulevard du Triomphe, B-1050 Brussels, Belgium \\

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{\bf   Abstract}
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Robust vertex fitting algorithms are expected to improve the knowledge of the 
vertex position and of its uncertainty, in the presence of mis-measured or 
mis-associated tracks. Such contaminations are likely to happen in high 
luminosity HEP experiments. We have performed a simulation study of the sensitivity of 
two types of robust algorithms : a trimmed least-squares estimator and 
an adaptive estimator. 
Their statistical properties are studied as a function of the source 
and the level of contamination, and compared to the results obtained 
with classical least-squares estimators.
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{\em (Contribution for the BPS International Scientific Meeting 2004)}
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