B. and N. B. ?b, une variation statistique compatible avec le nombre d'´ evénements de signal attendus. P(i, b) est la probabilité poissonienne que le bruit de fond donne un nombre d'´ evénementsevénementségal ou supérieursupérieurà N B + N S . N B est connuè a une incertitude ?B près et P(i, b) est donc moyenné

N. S. , N. B. ?b-)-dans-chaque, and R. , Cependant, le simple produit donne des valeurs optimistes dans l'hypothèse d'une fluctuation du bruit de fond qui est la même dans toutes les régions de signal ce qui n'est généralement pas vrai, La sensibilité obtenue en combinant des régions de signal peutêtrepeutêtre calculéè a partir du produit des probabilités p

S. Dans-cette-thèsen and N. B. Rs-i, on fera l'approximation que N B et N S sont suffisament grands, c'estàestà dire gaussiens. L'approximation suivante est alors correcte [137] : Zn comb 2 = i=1

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