Run9 GammaJet Distributions

Jet and skim tree synchronization events = 4122126 (Runs included from days 141,142,143)

Events satisfying trigger condition = 65492

Events after finding the best vertex = 44402

Events after z vertex cut = 38791 (+- 100 cm)

Events having two jets and one photon = 4967

Photon matched to one of the jets within a cone radius of 0.7 = 4918

Photon didn't match to any of the jets within a cone radius of 0.7 = 49

Same side jet having barrel towers = 1119

GammaJet candidates after matching = 4918

GammaJet candidates for which away side jet was found = 4398

GammaJet candidates left after imposing detector eta cut on away side jet = 3480

GammaJet candidates after requiring pT>7GeV cut on the photon = 1849

GammaJet candidates after requiring pT>5GeV cut on the away side jet = 1849

Following distributions are based on this sample (1849)

pT distribution

Pseudorapidity distribution

Phi and eta correlation

Z vertex distribution

Pre-shower energy deposition

Track multiplicity and photon's hit position

Number of barrel and endcap towers fired within a cone radius of 0.7

Photon Jet Balance

Let us look at the numbers again.........

GammaJet candidates after requiring pT>5GeV cut on the away side jet = 1849

GammaJet candidates after track isolation cut = 1470

Away side jet neutral fraction < 0.9 = 1443

EMC isolation cut =587

No barrel towers =481  

Numbers sorted into different preshower bins

(I)pre1=0, pre2=0 (25)

(II)pre1=0,pre2>0(48)

(III) pre1>0 and pre1<4MeV (152)

(IV) pre1>=4MeV (256)

Gamma candidates having no jet = 8

Gamma candidates having one jet = 3861

Away side jet found for monojet event = 19

Gamma candidates having three jets = 639

Gamma candidates having four jets = 49