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Gravitons

Gravitons. A first look into. RS. at ATLAS. Tracey Berry Royal Holloway. RS Gravitons Datasets. MC Dataset 3400 G  gg and 10200 G  ee Events: Generated with Mass = 1000 GeV k/M pl =0.1 Code version 11.0.42 and reconstructed with FullSim

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Gravitons

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  1. Gravitons A first look into RS at ATLAS Tracey Berry Royal Holloway

  2. RS Gravitons Datasets MC Dataset • 3400 Ggg and 10200 Gee Events: • Generated with Mass = 1000 GeV k/Mpl=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 lookat distributions. More detailed investigations to follow in future…. Thanks to Barry King at Liverpool for generating the samples and producing ntuples.

  3. ee Invariant Mass 10190 5323 Generator level invariant mass: first two e+/- with opposite charge and with E>100 GeV Reconstructed mass:highest energy 2 e’s in the eventwhich pass the selection criteria No +/- requirement here

  4. Reconstructed e/g Selection Criteria Electron:Has a TrackIsEMel==0Pt > 5.0|Eta|<2.5E/P>0.5WeightRatio>0.6NBel + NPixel>0NHitsel    = NBel + NPixel + ElecNSCTHits[i-1] + ElecNTRTHits[i-1]> 5 Photon:isEMphot==0Etphot>5.0|Eta|<2.5Charge photon==0

  5. Reconstructed e variables 5323

  6. Gee Distributions peaks at p implies e’s back-to-back

  7. Charge Reconstruction When more generator information available will match generated and reconstructed electrons Reconstructed mass:highest energy 2 e’s in the event which pass the selection criteria 94.8% 5.2%

  8. Gee Events Most events have 1 or 2 “good” reconstructed electrons

  9. Ggg Reconstructed mass:highest Et 2 g’s in the event which pass the selection criteria

  10. 2 Highest Et Photon Variables Reconstructed information

  11. Ggg

  12. Future Plans • Look at new samples which have more generator level information available. • Look into reconstruction efficiency • Investigate e/g selection criteria • Look into backgrounds

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