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Discovery potential for H + decaying to SUSY particles

Discovery potential for H + decaying to SUSY particles. 30 March 2005, ATLAS Higgs Working Group Meeting, CERN. Introduction. ATLAS 300 fb -1. Introduction (cont). Introduction (cont). Signal. SM Bkg. SUSY Bkg. Event Production.

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Discovery potential for H + decaying to SUSY particles

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  1. Discovery potential for H+ decaying to SUSY particles 30 March 2005, ATLAS Higgs Working Group Meeting, CERN

  2. Introduction ATLAS 300 fb-1

  3. Introduction (cont)

  4. Introduction (cont)

  5. Signal SM Bkg SUSY Bkg Event Production • Used HERWIG for event production and ATLFAST for fast detector simulation (ATLAS 7.0.3) • Have MC data for tanβ = 3, 5, 8, 10, 15, 20, 25, 30, 35, 40 and mA = 200, 220, 230 250, 300, 350, 400, 450, 500 GeV, in the Parameter Set A

  6. Cross Section Signal Cross Section; NLO from SM-Bkg Cross Section; CS(tt) = 737 pb (NLO) CS(ttZ) = 431 fb (LO from Herwig) SUSY-Bkg Cross Section; (LO from Herwig)

  7. Signal Branching Ratio: H+ is forced to decay to χχ which are forced to decay to 3 leptons and a number N of undetectable particles • The top is forced to decay hadronically e.g. for tanβ = 20, mA = 350 BRTOT = BR(H+→ χχ→3l+N)*BR(t→bqq) = 0.26*2/3 = 0.18 Signal Branching Ratio

  8. The Signal Examples of H+→ 3l+N

  9. Cuts: 3 Lepton Cut

  10. Cuts: 2l Mass Cut • χ0j→ 2 same flavor, opposite sign leptons + one or more undetectable particle(s) • Out of the three isolated leptons at least 2 are required to have same flavor and opposite sign • The inv. mass of these two is kinematically constrained. • E.g. if χ0j only decayed to one undetectable particle (χ01) it follows that • If tanβ = 10 and mA = 350 GeV we have m(χ01) = 78 GeV, m(χ02) = 131 GeV and m(χ03) = 146 GeV  Mllmax = 51 (68) GeV for j = 2 (j = 3) • If third lepton has same flavor, the biggest Mll are used for the cut 10 < Mll < 63

  11. Cuts: 2l Mass Cut Signal events, gb → H+t All Backgrounds

  12. Cuts: 2l Mass Cut

  13. Cuts: Top Cut

  14. Cuts: Jet Cut Signal events, gb → H+t All Backgrounds

  15. Cuts: Jet Cut

  16. Cut Results L = 300 fb-1

  17. 5- Discovery Contour for H+ Set A

  18. 5- Discovery Contour for H+

  19. Paper More Sets Contour CMS Conclusions and Future Work • Our discovery region is about same size as that obtained for CMS. Different shapes, due to • Different cuts • Different used cross sections (We: NLO for signal & tt and LO for the rest. They: LO for all) • Different detector descriptions (ATLFAST vs. CMSJET) • The 5- significance contour for H+ through H+ → χχ encloses major part of intermediate tanβ region • More MSSM parameter sets need to be analysed for a more general conclusion • Our paper is currently an ATLAS communication: (ATL-COM-PHYS-2005-008)

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