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Update on UED studies

This update provides an overview of the UED model, Pythia6 Generator, and analysis of lightning properties. It discusses the possibility of SM particles propagating in higher dimensions, the validity of effective theory, and the cascade decay of heavier modes. The implementation of Pythia in CMS and the development of algorithms for background evaluation are also discussed. Future plans include running FastSim and implementing PAT for systematics and event analysis.

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Update on UED studies

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  1. Update on UED studies F. Marinho – 30/09/2009

  2. Introduction • UED model • Pythia6 Generator • Recap • Designing analysis

  3. Lightning overview • UED models interesting properties • SM particles allowed to propagate in 4+ dimensions • Effective theory valid below cutoff ~20 - 50 TeV • Compactification length of EDR > 1/R and 1/R  EW scale • SM field  KK partner(a whole tower) • KK parity conservation renders LKP stableED momentum  KK parity • Heavier modes cascade decay to the LKP by emitting relatively soft SM particles. • Extend to allow gravity spreading in 4+N dimensionsLKP  SM partner + light graviton

  4. Pythia implementation first order radiative corrections • Minimal formulation: SM particles in 4 + 1 space-time • Adjustable parameters, 1/Ror can fix 1 parameter and vary /R • Mass spectra given by • Only n=0 (SM) and n=1 are implemented • KK number conserved KK particles are always produced in pairs.

  5. Previously • Pythia6 generator recently available for CMS • Newest version slightly modifiedA little of juggling was needed • Parameters were set correctly • Basic checks were runOverall cross sections • Cross section comparison CMSSW vs standalone PythiaLHC pp 14/10 TeV • Comparison between versions LHC pp 14/10 TeV and Tevatron scenario

  6. Filters and Validation Software • Algorithms developed to evaluate whether the generated events are ok or not.Pt, invariant masses, angular distributions,… • Particular channels have to be filtered on the UED generator (SS dilepton, 4 leptons) • All CMSSW framework based. • Algorithms for background under developed.Caio, Cesar, Matheus, Tiago • At the end hope to have everything packed together.

  7. Fast Simulation • Working with CMSSW_3_1_1 version. • UED particles unknown to the framework.Easy wrap to run FastSim on these events. • Full chain is complete. Trigger can be included. • Event objects availabe after reconstruction.Learning classes and methods via doxygen/workbook/tutorials • Allows systematics:alignment and calibrations

  8. Right now… • Moving to a CMSSW newer version. • In addition, would like to use PAT. Total failure on 3_1_1. Not sure what was/is the issue • Pick a SS dilepton set with fixed  and 1/R and carry on full simulation chain. • Same for background. • Continue with event analysis. • Once it is done repeat exercise for various 1/R. • Present it to Exotica group anytime in between.

  9. We need: • Implement algorithm for signal selection and background rejection.Basic code already exists • Studies of background generationmustbe finished by next week. • Should get those through FastSim. • Will Caio, Cesar, Matheus e Tiago run FastSim???

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