Pseudoscalar Higgs boson signatures at the LHC

Transcription

1 Pseudoscalar Higgs boson signatures at the LHC David Englert in collaboration with Elena Accomando, Matthew Chapman, Stefano Moretti International School of Subnuclear Physics Erice, Sicily 2 June, 216

2 Motivation Pseudoscalar Higgs boson signatures at the LHC 1 David Englert (NExT, Southampton & QMUL)

3 Motivation Higgs discovery papers (212) We have found a Higgs-like boson. Pseudoscalar Higgs boson signatures at the LHC 1 David Englert (NExT, Southampton & QMUL)

4 Motivation Higgs discovery papers (212) We have found a Higgs-like boson. Are there others? Pseudoscalar Higgs boson signatures at the LHC 1 David Englert (NExT, Southampton & QMUL)

5 Motivation Higgs discovery papers (212) We have found a Higgs-like boson. Are there others? Family replication for fermions, wouldn t be surprising to see something similar in the scalar sector... Pseudoscalar Higgs boson signatures at the LHC 1 David Englert (NExT, Southampton & QMUL)

6 Minimalistic extension of the Higgs sector: 2HDM Pseudoscalar Higgs boson signatures at the LHC 2 David Englert (NExT, Southampton & QMUL)

7 Minimalistic extension of the Higgs sector: 2HDM Two complex doublets: Φ 1 and Φ 2 = 2 }{{} two 2 }{{} doublet }{{} 2 = 8 d.o.f. complex Pseudoscalar Higgs boson signatures at the LHC 2 David Englert (NExT, Southampton & QMUL)

8 Minimalistic extension of the Higgs sector: 2HDM Two complex doublets: Φ 1 and Φ 2 = 2 Particle content: Scalars: h, H, A, H ± (5 d.o.f) }{{} two 2 }{{} doublet }{{} 2 = 8 d.o.f. complex Pseudoscalar Higgs boson signatures at the LHC 2 David Englert (NExT, Southampton & QMUL)

9 Minimalistic extension of the Higgs sector: 2HDM Two complex doublets: Φ 1 and Φ 2 = 2 }{{} two 2 }{{} doublet }{{} 2 = 8 d.o.f. complex Particle content: Scalars: h, H, A, H ± (5 d.o.f) Goldstone bosons longitudinal components of W ± and Z (3 d.o.f) Pseudoscalar Higgs boson signatures at the LHC 2 David Englert (NExT, Southampton & QMUL)

10 Minimalistic extension of the Higgs sector: 2HDM Two complex doublets: Φ 1 and Φ 2 = 2 }{{} two 2 }{{} doublet }{{} 2 = 8 d.o.f. complex Particle content: Scalars: h, H, A, H ± (5 d.o.f) Goldstone bosons longitudinal components of W ± and Z (3 d.o.f) minimal extension to SM, adds the fewest arbitrary parameters satisfies ρ = m 2 W m 2 Z cos 2 (θ W ) 1 rich phenomenology: CP violating phase, charged Higgs, etc. can be matched to SUSY (MSSM) λ 1 = λ 2 = 1 4 (g 2 + g 2 ), λ 3 = 1 4 (g 2 g 2 ), λ 4 = g 2 λ 5 = λ 6 = λ 7 =, Higgs Hunters guide [Gunion et al., 199] m 2 12 = m 2 A cos(β) sin(β) 2, Pseudoscalar Higgs boson signatures at the LHC 2 David Englert (NExT, Southampton & QMUL)

11 2HDM - Higgs potential Pseudoscalar Higgs boson signatures at the LHC 3 David Englert (NExT, Southampton & QMUL)

12 2HDM - Higgs potential Higgs potential: [ ] V gen = m11φ 2 1 Φ 1 + m22φ 2 2 Φ 2 m12φ 2 1 Φ 2 + h.c + 1 ( ) 2 λ 1 Φ 2 1 Φ 1 ( ) λ 2 Φ 2 ( ) ( ) 2 Φ 2 + λ3 Φ 1 Φ 1 Φ 2 Φ 2 ) ( ) { 1 ( ) + λ 4 (Φ 1 Φ 2 Φ 2 Φ λ 5 Φ 2 ( ) ( )] } 1 Φ 2 + [λ 6 Φ 1 Φ 1 + λ 7 Φ 2 Φ 2 Φ 1 Φ 2 Pseudoscalar Higgs boson signatures at the LHC 3 David Englert (NExT, Southampton & QMUL)

13 2HDM - Higgs potential Higgs potential: [ ] V gen = m11φ 2 1 Φ 1 + m22φ 2 2 Φ 2 m12φ 2 1 Φ 2 + h.c + 1 ( ) 2 λ 1 Φ 2 1 Φ 1 ( ) λ 2 Φ 2 ( ) ( ) 2 Φ 2 + λ3 Φ 1 Φ 1 Φ 2 Φ 2 ) ( ) { 1 ( ) + λ 4 (Φ 1 Φ 2 Φ 2 Φ λ 5 Φ 2 ( ) ( )] } 1 Φ 2 + [λ 6 Φ 1 Φ 1 + λ 7 Φ 2 Φ 2 Φ 1 Φ 2 Parameters: m 2 11, m 2 22, m 2 12 and λ i where i = 1,..., 7 Pseudoscalar Higgs boson signatures at the LHC 3 David Englert (NExT, Southampton & QMUL)

14 2HDM - Higgs potential Higgs potential: [ ] V gen = m11φ 2 1 Φ 1 + m22φ 2 2 Φ 2 m12φ 2 1 Φ 2 + h.c + 1 ( ) 2 λ 1 Φ 2 1 Φ 1 ( ) λ 2 Φ 2 ( ) ( ) 2 Φ 2 + λ3 Φ 1 Φ 1 Φ 2 Φ 2 ) ( ) { 1 ( ) + λ 4 (Φ 1 Φ 2 Φ 2 Φ λ 5 Φ 2 ( ) ( )] } 1 Φ 2 + [λ 6 Φ 1 Φ 1 + λ 7 Φ 2 Φ 2 Φ 1 Φ 2 Parameters: m 2 11, m 2 22, m 2 12 and λ i where i = 1,..., 7 Φ 1 = v ( ) 2 cos(β) Φ 2 = v ( ) 2 sin(β) Pseudoscalar Higgs boson signatures at the LHC 3 David Englert (NExT, Southampton & QMUL)

15 2HDM - Higgs potential Higgs potential: [ ] V gen = m11φ 2 1 Φ 1 + m22φ 2 2 Φ 2 m12φ 2 1 Φ 2 + h.c + 1 ( ) 2 λ 1 Φ 2 1 Φ 1 ( ) λ 2 Φ 2 ( ) ( ) 2 Φ 2 + λ3 Φ 1 Φ 1 Φ 2 Φ 2 ) ( ) { 1 ( ) + λ 4 (Φ 1 Φ 2 Φ 2 Φ λ 5 Φ 2 ( ) ( )] } 1 Φ 2 + [λ 6 Φ 1 Φ 1 + λ 7 Φ 2 Φ 2 Φ 1 Φ 2 Parameters: m 2 11, m 2 22, m 2 12 and λ i where i = 1,..., 7 Φ 1 = v ( ) 2 cos(β) Φ 2 = v ( ) 2 sin(β) CP-conserving potential if: m 2 12, λ 5, λ 6, and λ 7 are simultaneously real. Z 2 symmetry: Φ 1,2 ±Φ 1,2. Hybrid parametrization: [Haber and Stal, 215] m h, m }{{ H, cos(β α), tan(β) }}{{}}{{} CP-even Higgs masses determines g hvv & g HVV couplings ratio of the vevs., Z 4, Z 5, Z }{{} 7 Higgs self-coupling parameters Pseudoscalar Higgs boson signatures at the LHC 3 David Englert (NExT, Southampton & QMUL)

16 2HDM - Yukawa sector Scaling of couplings with respect to SM in 2HDM: Model Type-I Type-II [Ferreira et al., 214] h H A u d l u d l u d l cos α cos α cos α sin α sin α sin α sin β sin β sin β sin β sin β sin β cot β cot β cot β cos α sin β sin α cos β sin α sin β sin α sin β cos α sin β cos α sin β cot β tan β tan β Pseudoscalar Higgs boson signatures at the LHC 4 David Englert (NExT, Southampton & QMUL)

17 2HDM - Yukawa sector Scaling of couplings with respect to SM in 2HDM: Model Type-I Type-II [Ferreira et al., 214] Type-II case: h H A u d l u d l u d l cos α cos α cos α sin α sin α sin α sin β sin β sin β sin β sin β sin β cot β cot β cot β cos α sin β sin α cos β sin α sin β sin α sin β cos α sin β cos α sin β cot β tan β tan β h DD = sin α cos β hūu = cos α sin β = sin(β α) cos(β α) tan β 1 (middle-region) β α= = sin(β + α) + cos(β + α) tan β 1 (right-arm) β+α= π 2 = sin(β α) + cos(β α) cot β 1 (middle-region) β α= = sin(β + α) + cos(β + α) cot β 1 (right-arm) β+α= π 2 A coupling dependence: large tan β = d-type dominated small tan β = u-type dominated with t and b as dominant contributions, the crossover at tan β 6.46 Pseudoscalar Higgs boson signatures at the LHC 4 David Englert (NExT, Southampton & QMUL)

18 Motivation Dedicated searches for an extended Higgs sector at the LHC: (not a complete list) CMS-HIG Searches for heavy Higgs bosons in two-higgs-doublet models and for t ch decay using multilepton and diphoton final states in pp collisions at 8 TeV CMS-HIG Search for a pseudoscalar boson decaying into a Z boson and the 125 GeV Higgs boson in llbb final states CMS-HIG-15-1 Search for neutral resonances decaying into a Z boson and a pair of b jets or tau leptons CMS-HIG Search for a charged Higgs boson in pp collisions at s = 8 TeV CMS-HIG-16-6 Search for a neutral MSSM Higgs boson decaying into ττ at 13 TeV CMS-HIG-16-7 Summary results of high mass BSM Higgs searches using CMS run-i data ATLAS-HIGG Search for charged Higgs bosons in the H ± tb decay channel in pp collisions at s = 8 TeV using the ATLAS detector ATLAS-HIGG Search for Higgs bosons in Two-Higgs-Doublet models in the H WW eνµν channel with the ATLAS detector ATLAS-HIGG Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector ATLAS-HIGG Search for a CP-odd Higgs boson decaying to Zh in pp collisions at s = 8 TeV with the ATLAS detector ATLAS-HIGG Search for a CP-odd Higgs boson decaying to Zh in pp collisions at s = 13 TeV with the ATLAS detector Pseudoscalar Higgs Charged Higgs Pseudoscalar Higgs boson signatures at the LHC 5 David Englert (NExT, Southampton & QMUL)

19 2HDM - Current status CMS BSM Higgs Run-1 Summary result: CMS-HIG-16-7 Although the data slightly prefer a positive sign of λ du, the positive and negative signs can not be distinguished at the 95% CL. = Right arm still well and alive. Pseudoscalar Higgs boson signatures at the LHC 6 David Englert (NExT, Southampton & QMUL)

20 A Zh search gg initiated processes: g Z f f g f A h q q initiated processes: g + f g f f Z Z g + h g f f f f Z h q Z q Z q Z q A h + q Z h + q q h gg Zh NNLO correction in the SM[C.Englert et al., 214] MSSM scenario [Kniehl and Palisoc, 212] Pseudoscalar Higgs boson signatures at the LHC 7 David Englert (NExT, Southampton & QMUL)

21 Constraints on the parameter space Experimental constraints: Experimental limits on flavour changing neutral currents (FCNC) = Z 2 symmetry of the dimension 4 terms of the Higgs potential. Observed Higgs signal couplings: χ 2 fit to data (with HiggsSignals) constructing χ 2 = χ 2 χ 2 min, and identifying the 1, 2 and 3σ regions Non-observation of additional Higgs states: negative LHC searches 95 % exclusion limits (HiggsBounds) Electro-Weak Precision Observables (EWPO): Check on ρ, S, T, U parameters. Satisfied if m ± H is degenerate. Flavour Physics constraints: From B X s γ at CLEO, Belle and BABAR = m H ± > 48GeV at 95 % [Misiak et al., 215] Pseudoscalar Higgs boson signatures at the LHC 8 David Englert (NExT, Southampton & QMUL)

22 Constraints on the parameter space Theoretical constraints: Unitarity of the scattering matrix S: upper bound on the eigenvalues of the matrix L i 16π [Ginzburg and Ivanov, 25, Kanemura et al., 1993] Perturbativity: quartic Higgs couplings should be small C Hi H j H k H l 8π Stability of the potential: the quartic Higgs potential terms are bounded from below λ 1 >, λ 2 >, λ 3 + λ 1 λ 2 >, λ 3 + λ 4 λ 5 + λ 1 λ 2 > [Nilendra G. Deshpande and Ma, 1978] Using 2HDMC [Eriksson et al., 21] Pseudoscalar Higgs boson signatures at the LHC 9 David Englert (NExT, Southampton & QMUL)

23 Parameter scan in 2HDM Hybrid basis: 2HDM Type-II parameter space excluded/allowed regions 2 m h = 125. GeV/c 2 18 m A = 15. GeV/c 2 m H = 5. GeV/c 2 m +/- H = 5. GeV/c Z7 =. 1 σ exp. fit allowed 2 σ exp. fit allowed 3 σ exp. fit allowed tan(β) cos(β-α) Considering bounds from LHC signal strengths only Pseudoscalar Higgs boson signatures at the LHC 1 David Englert (NExT, Southampton & QMUL)

24 Parameter scan in 2HDM Hybrid basis: 2HDM Type-II parameter space excluded/allowed regions 2 m h = 125. GeV/c 2 18 m A = 15. GeV/c 2 m H = 5. GeV/c 2 m +/- H = 5. GeV/c Z7 =. 1 σ exp. fit allowed 2 σ exp. fit allowed 3 σ exp. fit allowed HB. 95% CL. excl. tan(β) cos(β-α) + applying exclusion limits from the non-observation of additional Higgs Pseudoscalar Higgs boson signatures at the LHC 11 David Englert (NExT, Southampton & QMUL)

25 Parameter scan in 2HDM Hybrid basis: 2HDM Type-II parameter space excluded/allowed regions 2 m h = 125. GeV/c 2 18 m A = 15. GeV/c 2 m H = 5. GeV/c 2 m +/- H = 5. GeV/c Z7 =. 1 σ exp. fit allowed 2 σ exp. fit allowed 3 σ exp. fit allowed HB. 95% CL. excl. uni. excluded tan(β) cos(β-α) + applying unitarity constraints Pseudoscalar Higgs boson signatures at the LHC 12 David Englert (NExT, Southampton & QMUL)

26 Parameter scan in 2HDM Hybrid basis: 2HDM Type-II parameter space excluded/allowed regions 2 m h = 125. GeV/c 2 18 m A = 15. GeV/c 2 m H = 5. GeV/c 2 m +/- H = 5. GeV/c Z7 =. 1 σ exp. fit allowed 2 σ exp. fit allowed 3 σ exp. fit allowed HB. 95% CL. excl. uni. excluded per. excluded tan(β) cos(β-α) + applying perturbativity constraints Pseudoscalar Higgs boson signatures at the LHC 13 David Englert (NExT, Southampton & QMUL)

27 Parameter scan in 2HDM Hybrid basis: 2HDM Type-II parameter space excluded/allowed regions 2 m h = 125. GeV/c 2 18 m A = 15. GeV/c 2 m H = 5. GeV/c 2 m +/- H = 5. GeV/c Z7 =. 1 σ exp. fit allowed 2 σ exp. fit allowed 3 σ exp. fit allowed HB. 95% CL. excl. uni. excluded per. excluded stb. excluded tan(β) cos(β-α) + applying stability constraints = strongly constrained parameter space Pseudoscalar Higgs boson signatures at the LHC 14 David Englert (NExT, Southampton & QMUL)

28 σ gg Zh dependence on cos(β α)& tan(β) 1 2HDM Type-II, σ (gg -> Z -> Zh) 6 tan(β) cos(β-α) σ [fb] 1 2HDM Type-II, σ (gg -> A -> Zh) 14 tan(β) cos(β-α) σ [fb] m A = 15 GeV 2HDM Type-II, σ (gg -> Z + A -> Zh) interference cos(β-α) Pseudoscalar Higgs boson signatures at the LHC 15 David Englert (NExT, Southampton & QMUL) tan(β) σ [fb]

29 Zh spectrum, SM scenario (prelim) SM - parton-level, dσ/dm Zh, LHC at 13 TeV, (qq)+(gg) -> Zh process (triangle only) 7 6 qqzh+ggzh qqzh dσ/dm Zh [fb/gev] m Zh [GeV/c 2 ] SM - parton level, dσ/dm Zh, LHC at 13 TeV, (gg) -> Zh) process (triangle only).35 σ(gg->zh) = fb ggzh.3 σ(qq->zh) = fb dσ/dm Zh [fb/gev] w/o any kin. cuts m Zh [GeV/c 2 ] Pseudoscalar Higgs boson signatures at the LHC 16 David Englert (NExT, Southampton & QMUL)

30 Zh spectrum, 2HDM Type-II scenario (prelim) Hybrid basis: m A = GeV/c 2 Γ A =.21 GeV cos(β-α) =.65 tan(β) = 2.24 dσ/dm Zh [fb/gev] 2HDM Type-II, dσ/dm Zh, LHC at 13 TeV, (gg qq) -> (Z + A -> Zh) process ggzh (A+Z) qqzh (A+Z) m h = 125. GeV/c 2 m H = 5. GeV/c m ZH [GeV/c 2 ] m H +/- = 5. GeV/c 2 Z4 = Z5 = 1.92 Z7 =. dσ/dm Zh [fb/gev] 2HDM Type-II, dσ/dm Zh, LHC at 13 TeV, (gg -> Z + A -> Zh) process Z A A+Z interfer. σ(z) = fb σ(a) = fb σ(a+z) = fb σ(interference left) = -.1 fb σ(interference right) = fb σ(interference tot) = fb σ(a)[m A +/-5 GeV] =.16 fb σ(a+z)[m A +/-5 GeV] =.3 fb w/o any kin. cuts modified couplings m ZH [GeV/c 2 ] for cos(β α) > = positive interference of SM background and BSM signal (hasn t been taken into account in the exp. searches) Pseudoscalar Higgs boson signatures at the LHC 17 David Englert (NExT, Southampton & QMUL)

31 Summary and Outlook Preliminary findings: Restricted parameter space if every constraint is taken into account. Under threshold A (m A < m h + m Z ) might be observable through the enhancement at the top-quark threshold. To do: Include box contribution of gg Zh process (in correspondence with authors) Redo parameter scan with box included Find the allowed regions in the decoupling and/or alignment limit Pseudoscalar Higgs boson signatures at the LHC 18 David Englert (NExT, Southampton & QMUL)

32 Thank you for your attention! Pseudoscalar Higgs boson signatures at the LHC 19 David Englert (NExT, Southampton & QMUL)

33 Backup Pseudoscalar Higgs boson signatures at the LHC 2 David Englert (NExT, Southampton & QMUL)

34 2HDM bases and parametrizations General λ i, i = 1,..., 7, m12, 2 tan β Higgs basis Λ i, i = 1,..., 7, m ± H tan β = Physical basis m h, m H, m A, m ±, sin(β α), λ H 6, λ 7, tan β Pseudoscalar Higgs boson signatures at the LHC 21 David Englert (NExT, Southampton & QMUL)

35 Parameter scan in 2HDM tan(β) 2HDM Type-II, σ (gg -> Z -> Zh) cos(β-α) σ [fb] tan(β) 2HDM Type-II, σ (gg -> A -> Zh) cos(β-α) σ [fb] tan(β) HDM Type-II, σ (gg -> Z + A -> Zh) interference σ [fb] cos(β-α) -2 m A = 221GeV Pseudoscalar Higgs boson signatures at the LHC 22 David Englert (NExT, Southampton & QMUL)

36 Parameter scan in 2HDM tan(β) 2HDM Type-II, σ (gg -> Z -> Zh) cos(β-α) σ [fb] tan(β) 2HDM Type-II, σ (gg -> A -> Zh) cos(β-α) σ [fb] tan(β) 2HDM Type-II, σ (gg -> Z + A -> Zh) interference cos(β-α) σ [fb] m A = 257GeV Pseudoscalar Higgs boson signatures at the LHC 23 David Englert (NExT, Southampton & QMUL)

37 Spectrum Hybrid basis: m A = GeV/c HDM Type-II, dσ/dm Zh, LHC at 13 TeV, (gg -> Z + A -> Zh) process Z A A+Z interfer. Γ A =.33 GeV cos(β-α) =.1.5 tan(β) = 2.61 m h = 125. GeV/c 2.4 m H = 5. GeV/c 2 m H +/- = 5. GeV/c 2 dσ/dm Zh.3 Z4 = Z5 = Z7 =..1 σ(z) = fb σ(a) = 2.62 fb σ(a+z) = 54.4 fb σ(int) = 5.51 fb m ZH [GeV/c 2 ] Pseudoscalar Higgs boson signatures at the LHC 24 David Englert (NExT, Southampton & QMUL)

38 Spectrum Hybrid basis: m A = GeV/c HDM Type-II, dσ/dm Zh, LHC at 13 TeV, (gg -> Z + A -> Zh) process Z A A+Z interfer. Γ A = GeV cos(β-α) =.49 5 tan(β) = 3.72 m h = 125. GeV/c 2 4 m H = 5. GeV/c 2 m H +/- = 5. GeV/c 2 dσ/dm Zh 3 Z4 = Z5 =.99 2 Z7 =. 1 σ(z) = fb σ(a) = fb σ(a+z) = fb σ(int) = 2.47 fb m ZH [GeV/c 2 ] Pseudoscalar Higgs boson signatures at the LHC 25 David Englert (NExT, Southampton & QMUL)

39 Effect of smearing 2HDM Type-II, dσ/dm Zh, LHC at 13 TeV, (gg -> Z + A -> Zh) process 2HDM Type-II, dσ/dm Zh, LHC at 13 TeV, (gg -> Z + A -> Zh) process Hybrid basis: 1.4 Z A A+Z interfer. Hybrid basis: 1.4 Z A A+Z interfer. m A = GeV/c m A = GeV/c Γ A =.21 GeV σ(z) = fb Γ A =.21 GeV σ(z) = fb cos(β-α) =.65 1 σ(a) = fb σ(a+z) = fb cos(β-α) =.65 1 σ(a) = fb σ(a+z) = fb tan(β) = 2.24 σ(interference left) = -.1 fb tan(β) = 2.24 σ(interference left) = -.2 fb m h = 125. GeV/c 2.8 m H = 5. GeV/c 2 m.6 H +/- = 5. GeV/c 2 Z4 = dσ/dm Zh [fb/gev] σ(interference right) = fb σ(interference tot) = fb σ(a)[m A +/-5 GeV] =.16 fb σ(a+z)[m A +/-5 GeV] =.3 fb w/o any kin. cuts m h = 125. GeV/c 2.8 m H = 5. GeV/c 2 m.6 H +/- = 5. GeV/c 2 Z4 = dσ/dm Zh [fb/gev] σ(interference right) = fb σ(interference tot) = fb σ(a)[m A +/-5 GeV] =.16 fb σ(a+z)[m A +/-5 GeV] =.31 fb w/o any kin. cuts Z5 = Z5 = Z7 =..2 Z7 = m ZH [GeV/c 2 ] m ZH [GeV/c 2 ] 2HDM Type-II, dσ/dm Zh, LHC at 13 TeV, (gg -> Z + A -> Zh) process 2HDM Type-II, dσ/dm Zh, LHC at 13 TeV, (gg -> Z + A -> Zh) process Hybrid basis: 1.4 Z A A+Z interfer. Hybrid basis: 1.4 Z A A+Z interfer. m A = GeV/c m A = GeV/c Γ A =.21 GeV σ(z) = 27.8 fb Γ A =.21 GeV σ(z) = fb cos(β-α) =.65 1 σ(a) = fb σ(a+z) = 78.5 fb cos(β-α) =.65 1 σ(a) = 14.8 fb σ(a+z) = fb tan(β) = 2.24 σ(interference left) =. fb tan(β) = 2.24 σ(interference left) =.15 fb m h = 125. GeV/c 2.8 m H = 5. GeV/c 2 m.6 +/- H = 5. GeV/c 2 Z4 = dσ/dm Zh [fb/gev] σ(interference right) = fb σ(interference tot) = fb σ(a)[m A +/-5 GeV] =.12 fb σ(a+z)[m A +/-5 GeV] =.2 fb w/o any kin. cuts m h = 125. GeV/c 2.8 m H = 5. GeV/c 2 m.6 +/- H = 5. GeV/c 2 Z4 = dσ/dm Zh [fb/gev] σ(interference right) = fb σ(interference tot) = 36.7 fb σ(a)[m A +/-5 GeV] =.7 fb σ(a+z)[m A +/-5 GeV] =.24 fb w/o any kin. cuts Z5 = Z5 = Z7 =..2 Z7 = m ZH [GeV/c 2 ] m ZH [GeV/c 2 ] gen-level, 1%, 5%, 15% Pseudoscalar Higgs boson signatures at the LHC 26 David Englert (NExT, Southampton & QMUL)

40 Pseudoscalar Higgs boson signatures at the LHC 26 David Englert (NExT, Southampton & QMUL)