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Impact of ILC Tracker Design on e + e -  H 0 Z 0  m + m - X Analysis

Impact of ILC Tracker Design on e + e -  H 0 Z 0  m + m - X Analysis. Hai-Jun Yang & Keith Riles University of Michigan, Ann Arbor SiD Benchmarking Meeting December 19, 2006. Physics Motivation.

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Impact of ILC Tracker Design on e + e -  H 0 Z 0  m + m - X Analysis

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  1. Impact of ILC Tracker Design one+e-  H0Z0  m+m-X Analysis Hai-Jun Yang & Keith Riles University of Michigan, Ann Arbor SiD Benchmarking MeetingDecember 19, 2006

  2. Physics Motivation To determine the suitable ILC SiD tracker momentum resolution which is capable to make direct measurement of e+e-  H0Z0 m+m- X • Based on ILC500 beam setup • Polarization of e- is -85%, e+ is 0 • PandoraV2.3 (modified for H m+m- decay, thanks to Michael E. Peskin) and PythiaV3.3 • Java Analysis Studio V2.2.5 • SDMar01, Fast MC Simulation and 1000 fb-1 H.J. Yang - SiD Meeting

  3. Cross Section of HZ  m+mX H.J. Yang - SiD Meeting

  4. Monte Carlo Samples • Signal – 10K • e+e-  H0Z0 m+m-X • Cross section is 0.018278 fb for MH=120 GeV • 18 signal events expected for 1000 fb-1 • Background W+W- m+m-nn – 400 K • Cross section is 149.68 fb • 149680 WW events expected for 1000 fb-1 • Background Z0Z0 m+m-X – 100 K • Cross section is 31.6 fb • 31600 ZZ events expected for 1000 fb-1 H.J. Yang - SiD Meeting

  5. Preselection Cuts • “Good” m: • a) Pm > 20 GeV • b) |cos Qm | < 0.8 • At least 2 “Good” m • For | Mmm – 120 | < 5 GeV • Signal 10K  6442 Eff_signal = 64.42% • Bkgd ZZ 100K 382 Eff_zz = 0.382% • Bkgd WW 400K  1019 Eff_ww = 0.25475% H.J. Yang - SiD Meeting

  6. Additional Selection Cuts Hmm: 10K  6442  5959  5780  10.57 (exp) ZZ Bkgd: 100K  382  164  141  44.8 (exp) WW Bkgd:400K  1019  135  47  17.6 (exp) Angle between two m Polar angle of two m H.J. Yang - SiD Meeting

  7. Mmm vs Track Momentum Resolution H.J. Yang - SiD Meeting

  8. Signal Events - Detection Significance  The Hmm significance is improved with better track resolution. H.J. Yang - SiD Meeting

  9. Branching Ratio Uncertainty With the SiD’snominal momentum resolution, one can measure Br(Hmm) to 47%. The precision improves only modestly with improved track resolution. H.J. Yang - SiD Meeting

  10. Higgs Mass Resolution & Accuracy Better Higgs mass resolution with better track resolution. H.J. Yang - SiD Meeting

  11. Fit Mmm Distributions H.J. Yang - SiD Meeting

  12. Fit Mmm Distributions H.J. Yang - SiD Meeting

  13. Fit Mmm Distributions H.J. Yang - SiD Meeting

  14. Preliminary Conclusions With the SiD’snominal track momentum resolution, one can establish detection of Hmm with 4-sigma significance and can measure Br(Hmm) to 47%. The detection significance improves significantly with improved track momentum resolution, but branching ratio of Hmm improves only modestly. H.J. Yang - SiD Meeting

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