U. Exemple, eecacit e d u s y s t eme de d eclenchement d e n i v eau 2 pour le mode + ; . La gure A.1 repr esente la variable d'eecacit e q u i a et e implant ee dans la base de donn ees, en fonction du num ero de run. Seuls 65 runs sont r e p r esent es, p.4706

. Dans-ce-paragraphe, je donne la liste compl ete des variables qui m'ont paru illustrer la qualit e des donn ees a l ' echelle du run et qui ont t et e implant ees dans la base de donn ees, Quelques exemples de leur stabilit e

. Nombres-d-'ev-enements, cette s election sert avant t o u t t a comptabiliser les nombres de (( bons )) ev enements pr esents dans chaque run. La comparasion de ces quatre nombres permet de localiser des p eriodes de prise de donn ees tr es pathologiques

. Un-estimateur-na-f-du-bruit-de-fond, obtenu e n d i v i s a n t l e n o m bre d' ev enements dont le carr e de l'impulsion transverse ~ p ? est compris entre 400 et 600 (MeV/c) 2 , par ceux contenus dans la zone du signal +, p.2

. Le-nombre-d, ev enements eeectivement vus par le programme de reconstruction et de trage

. Le-nombre-d, ev enements qui passent les ltres appliqu es aux ev enements + ; (voir paragraphe 3.1.4) et 0 0 (voir paragraphe 3.2.3) Ces ltres utilisent l e r esultat de la reconstruction et l

. Le-nombre-d, ev enements + ; et 0 0 r epondant aux crit eres quasi--nals qui ont t egalement t et e utilis es a l ' echelle du run. Ces nombres sont petits a l ' echelle du burst et ne constituent pas une information statistiquement i n t eressante

. Premier, en plus d'un simple comptage, on peut tester la r epartition des ev enements dans le burst. P our voir si un des syst emes s'enclenche trop tard ou s'arr ete trop t^ ot, les temps (en unit e de 25 ns) du premier et du dernier ev enement apparaissant dans le burst est egalement stock e

A. La-gure, Les 120 035 bursts qui ont r e s i s t e e a la premi ere etape de s election sont A.2.2. Etudes et crit eres de s election pr esent. Ces sept bursts appartiennent t a u n m ^ eme run (4921) et sont nalement t elimin es de l' echantillon

L. Fait-que-certains-bursts-manquent-d-'ev-enements-+-;-peut-para^-tre-inqui-etant, tant o n souhaite que l'acquisition des quatre modes soit simultan ee. L' etude des variables de la base de donn ees pour des bursts pathologiques est susceptible de nous indiquer de quoi rel eve c e probl eme Certaines sources (temps mort ou d epassement de capacit e) ne sont pas dangereuses pour la prise de donn ees, puisque les pertes qu'elles entrainent o n t t et e sym etris ees avec les ev enements 0 0, ). D'autres ont donn e l i e u a d e n o u v eaux crit eres de s election. L'ensemble des faits observ es et des crit eres nalement utilis es sont r esum es dans l' enum eration ci-dessous

A. Comparaison-apr-es-ltrage-la-gure, 6 montre les nombres d' ev enements + ; et 0 0 qui passent la premi ere proc edure de ltrage

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