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Doubly charged Higgs bosons at Hadron Colliders and neutrino mass hierarchy

This study examines the search potential for doubly charged Higgs bosons at hadron colliders and its implications for neutrino mass hierarchy. It explores the Higgs Triplet Model and its striking signatures, as well as the current search strategies and potential improvements.

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Doubly charged Higgs bosons at Hadron Colliders and neutrino mass hierarchy

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  1. Doubly charged Higgs bosons at Hadron Colliders and neutrino mass hierarchy Mayumi Aoki (KEK) A.G.Akeroyd and M.A. PRD72,035011 (2005) (hep-ph/0506176)

  2. Motivation The observed neutrino oscillation data predict nonzero neutrino masses and mixings. • Higgs Triplet Model : SM + ΔSU(2)L Higgs triplet boson (Y=2) （Q=I3+Y/2） The most striking signature of Δ would be the observation of H±±. • LEP • Hadron colliders H±± →ℓi±ℓj± strong search potential

  3. 1 J.F.Gunion et al, hep-ph/9610237 B.Dion et al, PRD59 (1999) S.Chakrabarti et al, PLB434 (1998) E.J.Chun et al, PLB566(2003) Motivation Tevatron CDFII only Assuming B(H±±→li±lj±)=100% 240pb-1 of data collected at √s=1.96TeV We study the search potential for H±± at Tevatron in HTM. CDF Collab. PRL93(2004) • Single production of H±± • Nonleptonic decay • (for ｍH±±>ｍH±) • H±±→li±lj± in light of neutrino data

  4. Physical Higgs bosons u - r - £ Þ £ 3 D | 1 | 10 0 . 03 u F Higgs Triplet Model • Neutrino mass matrix Δ０develops a VEV : We are interested in

  5. Production of H±± at Tevatron Total H±±cross section Single H±± production can be as large as the pair production. Mass limit on mH±± increases significantly.

  6. Leptonic decay Normal hierarchy (NH) Inverted hierarchy (IH) Degenerate (DG) Decay of H±± The total leptonic decay width depends on which solution to the neutrino mass hierarchy is realized.

  7. Nonleptonic decay H±± → H±W(* ) Decay of H±± G: phase space factor Current search strategy is ineffective. An order of magnitude estimate of hij could be obtaiened. Current search strategy is effective. If H±±→ℓ± ℓ± are measured then the ratios of hij can be evaluated.

  8. Limit on mH±± Bilepton cross section mH±± > 130 GeV (μμ)

  9. Majorana phase dependence Assuming CP conservation, the following different patterns can be allowed. mH±± > 138 GeV (ee) mH±± > 120 GeV (eμ)

  10. mH±± > 132 GeV (μμ) mH±± > 122 GeV (ee) mH±± > 105 GeV (eμ) mH±± > 115 GeV (μμ)

  11. production significantly improves the search potential forH±± decay might be helpful to determine the absolute value of hij . We encourage a detailed experimental simulation of this decay mode at Tevatron. Neutrino mass spectrum might be distinguished by the leptonic decay mode. Summary • Higgs Triplet Model : SM + ΔSU(2)L Higgs triplet boson (Y=2) We have studied the search potential for H±± at Tevatron.

  12. Total H±±cross section LHC sensitivity up to 1 TeV

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