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Diffractive Higgs and dijet production at high-energy colliders

Diffractive Higgs and dijet production at high-energy colliders. St. Petersburg Nuclear Physics Institute, Gatchina. Victor T. Kim. Outline: Why Diffrractive Higgs? Double-Pomeron-Exchange (DPE) Hard Diffraction: dijets Higgs via single-Pomeron exchange Summary.

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Diffractive Higgs and dijet production at high-energy colliders

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  1. Diffractive Higgs and dijet production at high-energy colliders St. Petersburg Nuclear Physics Institute, Gatchina Victor T. Kim

  2. Outline: Why Diffrractive Higgs? Double-Pomeron-Exchange (DPE) Hard Diffraction: dijets Higgs via single-Pomeron exchange Summary Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  3. NLO S.Gorishny et al. 91 A.Kataev & VK 93 Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  4. Light Higgs at LHC 120 <mH<140 GeV L=30Fb-1 #events Significance • H -> γγ 300 3-4 σ ? • H-> jbbj 300 5-6 σ ? Diffractive Higgs • pp->pHp->pbbp 10 4σ Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  5. Diffractive Higgs via double-Pomeron-exchange (DPE) Schäfer, Natchtmann & Schöpf (90) Bialas & Landshoff (91) Higgs via WW- and ZZ-fusion: Dokshtzer, Khoze & Troyan (1987) Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  6. Double-Pomeron Exchange (DPE) Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  7. Durham-Gatchina model (Khoze, Martin & Ruskin) Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  8. Higgs production via double-Pomeron exchange (DPE) Khoze,Martin & Ryskin (97-02) De Roeck,Peschanski & Royon (01) Levin et al (98) Cudell et al (96) Ingelman et al (01) Petrov et al (04) Erhan, VK & Schlein (03) Exclusive channel: small x-section => 3 Fb ? Inclusive channel: huge background => s/b = 10-3 Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  9. Higgs production via DPE:signal/background Inclusive channel: σ ~ 40 Fb But: huge background => s/b = 10-3 Exclusive channel: Spin selection rules => background suppression by 10^4 De Roeck, Khoze,Martin & Ryskin (01-02) But: small σ ~ 3 Fb Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  10. Hard diffraction • Ingelman & Schlein (85) • UA8 (88): diffractive high-pT dijets ! Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  11. UA8 data from SppS (630 GeV)  Super-hard structure Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  12. Pomeron parton distributions Soft: β GIP(β,Q02)=6(1- β)5 Hard: βGIP(β,Q02)=6 β(1- β)1 Super-Hard: β GIP(β,Q02)=0.6 6(1- β)1 +0.4 δ(1- β) Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  13. SPE MC generator: GoZo • Pythia -> Pompyt -> GoZo At present: • Only SPE • Higgs boson production • included heavy quark jets Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  14. Hardping: 630 GeV (Anufriev & VK) Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  15. Hardping for LHC (Anufriev & VK) Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  16. Higgs production in Pomeron-p collisions xH =β-ξ= β- τ/βτ=MH2/MX2 dσ(Pp-> H)/dxH = σLOGN(τ/β,MH2) GIP(β,MH2) 2τ/√(xH2+4τ2) β = 2τ/(xH+√(xH2+4τ2)) Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  17. Kinematics of Higgs production via single-Pomeron exchange Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  18. pp c.m. system at fixed MX (ξ) Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  19. Higgs x-section in P-p collisions Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  20. Single-Pomeron Exchange SPE (Soft and Hard): non-central Hard SPE: central ! Pomeron-proton c.m.s. UA8 Collaboration Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  21. pp c.m. system Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  22. Total x-sections Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  23. Higgs via ingle-Pomeron exchange • Inclusive SPE: σ = 1 pb • Exclusve SPE Higgs ? Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  24. Higgs: SPE vs DPE σ(excl. DPE)< σ(excl. SPE)< σ(inel. SPE) Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  25. Exclusive Higgs SPE kinematics ξ1ξ2s = MH2 Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  26. Higgs via SPE: signal/background • Inelastic SPE: S/B as in inelastic • ExclusveSPE Higgs: pp->pHp • Selection rule for exclusive DPE Higgs ->bbar factor 1/3000 -> S/B ≈ 0.5 – 3.0 • Khoze, Martin & Ryskin (01) • De Roeck Khoze, Martin & Ryskin (02) • Boonekamp,Royon & Peshanski (04) • Selection rule depends only from final state ! (does not depend on production mechanism) Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  27. Exclusive SPE x-section Effective Higgs-nucleon interaction (via triangle anomaly): L=√(2GF)(2/3)(mN /b) ψψ Shifman, Vainshtein & Zakharov (78) αHNN/2π≈ 10-9 σ(excl. SPE)-> up to 0.1 σ(inel. SPE) -> up to 30 σ(excl. DPE) -> up to 100 Fb Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  28. Light Higgs at LHC 110 <mH<140 GeV L=30Fb-1 #events Significance • H -> γγ 300 3-4 σ • H-> jbbj 300 5-6 σ Diffractive Higgs • pp->pHp->pbbp 10 3σ • pp->pHX-pbbX 104 10-1σ ? • pp->pHp->pbbp 10-300 3-? σ Victor T. Kim St.Petersburg Nuclear Physics Instiutute

  29. Summary • Inelastic Higgs production via Single-Pomeron Exchange (~ 1 pb): larger than DPE x-section central region ! • Exclusive Higgs via SPE (b-bbar channel): signal/bkgd as good as in exclusive DPE ! Exclusive Higgs via SPE: (might be) a promising channel at LHC ! Victor T. Kim St.Petersburg Nuclear Physics Instiutute

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