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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 ALCPG Workshop at Fermilab October 22-26 , 200 7. 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 ALCPG Workshop at FermilabOctober 22-26, 2007

  2. Physics Motivation To determine asuitable ILC SiD tracker momentum resolution capable of making a direct measurement of e+e-  H0Z0 m+m- X Small BR H  m+m- H.J. Yang - H-->mumu update

  3. Cross Section of HZ  m+mX H.J. Yang - H-->mumu update

  4. MC Generator & Analysis Tool e+e-  H0Z0 m+m- X • Based on ILC350 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 • Track momentum resolution for SDMar01 D(1/pt) =  (2*10-5)2 + (7*10-4/pt/sinq)2 H.J. Yang - H-->mumu update

  5. Monte Carlo Samples • Signal – 10K:e+e-  H0Z0 m+m-X • MH=100, 110, 120, 130, 140, 150 GeV • Cross sections are 51, 46,38, 27, 16, 7ab, respectively. • Expected countsare 51, 46,38, 27, 16, 7 for 1000 fb-1 • Background e+e-  Z0Z0 m+m-X – 100 K, 31.6 fb • Background e+e-  W+W- m+m-nn – 400 K, 149.68 fb • Background e+e- Z/g m+m-- 500K, 2574.0 fb • Background e+e-  Zg m+m-g - 400K, 416.3 fb • Background e+e-  ZH m+m- H • MH=100, 110, 120, 130, 140, 150 GeV • 10K events for each Higgs mass point H.J. Yang - H-->mumu update

  6. Preselection Cuts • “Good” m: • a) Pm > 20 GeV • b) |cos Qm | < 0.8 • At least 2 “Good” m • Eff_signal ~ 62.4% – 65% H.J. Yang - H-->mumu update

  7. Selection Cuts (MH=100 GeV) Opening angle between two m Polar angle of two m H.J. Yang - H-->mumu update

  8. Selection Cuts (MH=120 GeV) Opening angle between two m Polar angle of two m H.J. Yang - H-->mumu update

  9. Selection Efficiency Lower efficiency for higher Higgs mass, which is mainly caused by wider opening angle between mm decay from Higgs. H.J. Yang - H-->mumu update

  10. Mmm vs Track Momentum Resolution MH=100 GeV MH=120 GeV H.J. Yang - H-->mumu update

  11. Signal Events - Detection Significance  Optimize Higgs significance for each Higgs mass point.  The Hmm significance is improved with better track resolution. H.J. Yang - H-->mumu update

  12. Branching Ratio Uncertainty The detection significance improves significantly with improved momentum resolution, but branching ratio of Hmm improves only modestly. H.J. Yang - H-->mumu update

  13. Higgs Mass Resolution H.J. Yang - H-->mumu update

  14. Higgs Mass Resolution H.J. Yang - H-->mumu update

  15. Higgs Mass Resolution Better Higgs mass resolution with better track resolution. H.J. Yang - H-->mumu update

  16. Preliminary Conclusions The SD tracker with nominal track momentum resolution makes it possible but still hard to measure e+e-H0Z0 m+m-X. But the direct measurement is feasible (>5 sigma for light Higgs mass ~ 100-140GeV) if the track momentum resolution is improved by a factor of ~ 2 or more. H.J. Yang - H-->mumu update

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