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Tracey Berry 1 Gravitons Tracey Berry Royal Holloway A first look into at ATLAS
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Tracey Berry 2 RS Gravitons Datasets MC Dataset 3400 G and 10200 G ee Events: Generated with Mass = 1000 GeV k/M pl =0.1 Code version 11.0.42 and reconstructed with FullSim Limited reconstruction information available. - can't trace mother/daughter - so just use the highest 2 Energy/Pt e/photons in the event for now to look at distributions. More detailed investigations to follow in future…. Thanks to Barry King at Liverpool for generating the samples and producing ntuples.
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Tracey Berry 3 ee Invariant Mass Generator level invariant mass: first two e+/- with opposite charge and with E>100 GeV Reconstructed mass: highest energy 2 e’s in the event which pass the selection criteria 10190 5323 No +/- requirement here
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Tracey Berry 4 Reconstructed e/ Selection Criteria Electron: Has a Track IsEMel==0 Pt > 5.0 |Eta| 0.5 WeightRatio>0.6 NBel + NPixel>0 NHitsel = NBel + NPixel + ElecNSCTHits[i-1] + ElecNTRTHits[i-1]> 5 Photon: isEMphot==0 Etphot>5.0 |Eta|<2.5 Charge photon==0
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Tracey Berry 5 Reconstructed e variables 5323
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Tracey Berry 6 G ee Distributions peaks at implies e’s back-to-back
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Tracey Berry 7 Charge Reconstruction When more generator information available will match generated and reconstructed electrons 5.2% 94.8% Reconstructed mass: highest energy 2 e’s in the event which pass the selection criteria
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Tracey Berry 8 Most events have 1 or 2 “good” reconstructed electrons G ee Events
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Tracey Berry 9 G Reconstructed mass: highest Et 2 ’s in the event which pass the selection criteria
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Tracey Berry 10 2 Highest Et Photon Variables Reconstructed information
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Tracey Berry 11 G
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Tracey Berry 12 Future Plans Look at new samples which have more generator level information available. Look into reconstruction efficiency Investigate e/ selection criteria Look into backgrounds
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