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Search For the Higgs H o ->ZZ*->bbll

Search For the Higgs H o ->ZZ*->bbll. Philip Davis (NMSU) Mentor: Dr. Teuscher (U of T) Aided by Christophe Le Maner (U of T). Higgs Signal. Back Grounds. Invariant Mass of Higgs for m H of 150 GeV before Cuts. Electron (shown) and Muon System Luminosity 30 fb -1

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Search For the Higgs H o ->ZZ*->bbll

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  1. Search For the Higgs Ho ->ZZ*->bbll Philip Davis (NMSU) Mentor: Dr. Teuscher (U of T) Aided by Christophe Le Maner (U of T)

  2. Higgs Signal Back Grounds Invariant Mass of Higgsfor mH of 150 GeV before Cuts • Electron (shown) and Muon System • Luminosity 30 fb-1 • Mass Analysis on mH of 150 GeV • tt • ZZ • Zbb • bb • Zee • Zmm

  3. Intro • Previous analysis of this decay channel done by Christophe Le Maner • Monte Carlo Data created using Pythia, MCatNLO, and AcerMC • New Monte Carlo Data simulated after first analysis • What I did • Try to recreate old analysis • Apply my own analysis • Create automated system of applying cuts

  4. Previous Analysis - Christophe Le Maner Repeating Previous Analysis (New Data)

  5. Gev • 50 < mzo < 110 GeV • 10 < mee < 65 GeV • (constrain leptons to come from Virtual Z) Histograms

  6. More Histograms Missing Pt < 25 GeV GeV GeV Mass of VBF jets > 300 GeV

  7. Pt of 2 jet (GeV) Pt of 1 jet (GeV) Pt of Forward Jet 1 Vs. Jet 2 • Sum > 90 GeV

  8. New Cuts • Problem with H130 data is that it start out with low number of events • Increase in S/√BG from old cuts • Increase in Relative Error from old cuts • H150 data gives better results but still low significance • Signal Rejection ~ 21% (H150 ee chanel) • Background Rejection ~ 0.028% (H150 ee chanel)

  9. Higgs Signal Signal after Cuts

  10. Fully Automated Cut System • Program run cuts over a range of values and stores results to root file. • Results searched my another program to return cuts with best outputs. • Only used old data on this program. • Relative Error usually about 100% • Next step should be to uses this method on new data

  11. Protection Circuit for LVPS

  12. Background • Front end electronics of the Tile Calorimeter in ATLAS are kept in drawers as seen above. • TileCal has 256 of these drawers • Each drawer requires its own power supply.

  13. Background/Problem • The Low Voltage Power Supply (LVPS) converts a 200 V DC power supply to 8 DC voltages required by the front end electronics in the TileCal. • When installed in the pit the LVPS has burned up components due to voltages going over their ratings. • Important issue for LHCC

  14. Solution • Regulating Circuit that monitors the 8 voltages and currents going to the detector. • Monitors for under-voltage, over-voltage, and over-current. • Circuit switches power off in TileCal when voltage or current goes out of range. • Voltages put into two groups. High Voltage side and Digitizer side. • High Voltage • When one side is triggered the other side can still operate.

  15. Circuit Simulation • Circuit simulated in Quartus II • Implemented in Embedded Local Monitor Board (ELMB) in the LVPS

  16. Current input Voltage input Trip Outputs 32 bit Shift Register Redundancy circuit Circuit Explanation

  17. Outputs of Digitizer and High Voltage Trigger Output of Shift Register Wave form of Inputs and Outputs

  18. Special Thanks • Dr. Teuscher • Christophe Le Maner • CERN • University of Michigan • NSF • Ford

  19. Backup slides

  20. Cut Table Cuts with weights for Electron Channel Cut mH tt Zbb ZZ Zee Zmm bb Total BG Signal/sqrt(BG) Total number of events 4.19315 41968.3 19334.4 64.86 8802.7 8911.03 176032 255113 0.00830183 number of bjets 3.92187 40309.1 18031.2 59.891 8723 0 117355 184478 0.00913106 invariant mass of electrons 2.63913 16928 1034.99 7.46192 55.3264 0 9338.7 47364.4 0.0121265 missing pt 2.05103 1380.35 815.202 5.61553 49.5229 0 0 2250.7 0.0432329 Delta of eta for VBF jets 2.05103 1380.35 815.202 5.61553 5.41657 0 0 2206.59 0.0436628 sum pt of vbf jets 1.35695 481.919 245.217 0.517659 0.386898 0 0 728.041 0.0502907 mass of vbf jets 1.32322 441.759 218.973 0.436551 0 0 0 661.169 0.0514607 eta1*eta2<0 1.32322 441.759 218.973 0.436551 0 0 0 661.169 0.0514607 zed mass 1.09917 115.89 91.0336 0.34113 0 0 0 207.265 0.0763487 even charge 1.0972 102.121 90.2135 0.331588 0 0 0 192.666 0.0790467 mass window 0.881866 33.2754 39.3659 0.0978065 0 0 0 72.7391 0.1034 Cuts with weights for Muon Channel Cut mH tt Zbb ZZ Zee Zmm bb Total BG Signal/sqrt(BG) Total number of events 3.62164 37159.4 15123.9 48.7148 8802.7 8911.03 176032 246078 0.00730077 Total number bjets 3.39871 35726.3 14185.7 45.2463 0 8818.64 58677.3 117453 0.00991704 invariant mass of muons 2.29167 13948.1 773.376 5.44377 0 6.70331 29338.7 44072.3 0.0109161 missing pt 1.97626 1040.72 666.76 4.52534 0 4.66317 29338.7 31055.3 0.0112144 Delta of eta for VBF jets 1.97626 1040.72 666.76 4.52534 0 0.874345 0 1712.88 0.0477508 sum pt of vbf jets 1.31479 346.523 223.073 0.527201 0 0 0 570.124 0.0550644 mass of vbf jets 1.28302 316.69 209.131 0.474719 0 0 0 526.296 0.0559266 eta1*eta2<0 1.28302 316.69 209.131 0.474719 0 0 0 526.296 0.0559266 zed mass 1.07471 81.4673 83.6525 0.372142 0 0 0 165.492 0.0835418 even charge 1.07415 78.025 83.6525 0.372142 0 0 0 162.05 0.0843803 mass window 0.87793 19.5063 37.7256 0.145517 0 0 0 57.3774 0.115902

  21. Output of HV and Digitizer Pins • Wave of output pins • Shows that each input works and that the corresponding output pin is triggered.

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