. Gev=c, (voir page 102) permet de ramener la section eecace J= au domaine de masse M . L'erreur induite sur le norme N J= E ? par l'incertitude sur les sections eecaces est report ee sur la gure 6, -b (enveloppes en pointill es) o u sont repr esent ees les pr edictions du mod ele avec et sans absorption nucl eaire, p.91

U. Algorithme, interaction avec une eecacit e sup erieure a 85% (et sup erieure a 92% pour la premi ere ciblette) La recherche des ev enements avec r einteraction de fragments est bas ee sur une m ethode de comparaison de forme. Elle permet d' eliminer les ev enements dimuons dont les quantit es physiques corr el ees ( energie transverse E ? , energie longitudinale r esiduelle E zdc ) s'en trouvent pollu ees. L'identiication des ev enements avec r einteractions les plus pollueurs autorise ainsi l'utilisation de ciblettes epaisses, en garantissant une mesure propre des quantit es physiques corr el ees aux paires de muons

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