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Activities with L3 and the Higgs

Activities with L3 and the Higgs. By : Mayukh Das. The need and the relevance. Online vs Offline data comparison for Level3 The scope of it happening locally Towards a new algorithm searching the Higgs. The flow of data at D Ø. Detector Front Ends. Level 2 Accept. Level3 Processor Nodes.

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Activities with L3 and the Higgs

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  1. Activities with L3 and the Higgs By : Mayukh Das

  2. The need and the relevance • Online vs Offline data comparison for Level3 • The scope of it happening locally • Towards a new algorithm searching the Higgs

  3. The flow of data at DØ Detector Front Ends Level 2 Accept Level3 Processor Nodes Event tag Generator Reconstruction

  4. Trigger Simulations and Purpose • Collection of Triggers maintained by a highly efficient group. • The package Trigsim checks the trigger algorithms and their respective efficiencies • Working with L1L2 , L3 and L3Debug chunks. • Upgraded and revised very frequently.

  5. Activities conducted • Running Trigsim successfully on monitor stream data and plotting the end distributions using ROOT. • Different simulations needed for online and offline root files. • Macro written to support interactive comparison of the correlated branches. • Thorough analysis with specific triggers conducted. • Link http://wwwd0.fnal.gov/computing/algorithms/level3/datamon/trig_inst.html

  6. Online Generally lesser events picked up The less number of tracks attributed towards fewer jets Making conditions more stringent helps in showing visible change Offline Generally higher events picked up Normally picks up all the jets available for tracks Not too much of difference while making conditions stringent. Observed comparisons

  7. TrigSim and Local Simulations • While running on site the main problem is sharing resources. • Running batch mode on SAM creates problems attributed to memory leaks • Once queued , if the dataset is long, one might have to wait for a day to get a simple result out. • GOAL : run TrigSim on CAPS cluster.

  8. TrigSim and Local Simulations • Setting up the environment for running the package has been accomplished • Linking the library ‘lCHistoB’ for TrigSimana_x and ScriptRunner_x is under process. • While running initially detection of D0race cluster was successful. • It shall be interesting to see whether running SAM interactively from CAPS is less time consuming.

  9. Searching for the Higgs • The last linking puzzle of the standard model • Origin of mass attributed towards Higgs Boson • If the Higgs exists it possibly plays a role in unifying various forces. • Proving the Higgs does not exist would be scientifically every bit as valuable as proving it does

  10. Pointers for the new algorithm • The tagging of the b-quarks efficiently is the key. • Secondary Vertexing, Impact parameters and Decay lengths were followed before. • Efficient tagging of soft muons shall be used in the present scope. • PYTHIA and HERWIG usage for MC event generators shall be used.

  11. Tagging with soft Muons s c μ+ b ע μ

  12. Presently…… The packages named l3fbtagip and l3fbtagip_results are being analyzed for possible improvements before writing ones own program.

  13. MUW_W_L2M3_TRK10 / 4 L1: NOT Cal unsuppressed readout and 'w' region (CFT) muon with tight scintillator and loose wire requirements. L2: Medium quality muon candidate with pt>3 GeV. L3: mark and pass 1 event in 2000 and set the trigger bit on if a global track with pt>10 GeV is found. MU_JT15_L2M0 / 3 L1: require a region=a (all muon) MUON scintillator trigger and one Calorimeter JET trigger tower with Et>3 GeV and NOT Cal unsuppressed readout. L2: require a MUON candidate with Medium quality and one jet with Et>10 GeV. L3: require at least one JET with Et>15 GeV be found using a simple cone algorithm. One in 40 events will be recorded and marked as unbiased. MU_JT20_MET10 L1: require a region=a (all muon) MUON scintillator trigger and one Calorimeter JET trigger tower with Et>3 GeV and NOT Cal unsuppressed readout. L2: require a MUON candidate with Medium quality and one jet with Et>10 GeV. L3: require at least one JET with Et>20 GeV be found using a simple cone algorithm. The event also must have missing Et>10 GeV.

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