Phenomenology of New Vector Resonances from SEWSB at Future e e- Colliders

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Phenomenology of New Vector Resonances from SEWSB
at Future ee- Colliders
IEP SAS, Kosice, May 13, 2005

• Ivan Melo

M. Gintner, I. Melo, B. Trpisova
(University of Zilina)
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Outline

• Motivation for new vector (?) resonances
• Strong EW Symmetry Breaking (SEWSB)
• Vector resonance model
• ? signals in e e- ? ??tt, e e- ? tt
• ? signal in pp ? ?tt ? WWtt

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Higgs boson
Higgs boson
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EWSB SU(2)L x U(1)Y ? U(1)Q

• Weakly interacting models
• - SUSY
• - Little Higgs
• Strongly interacting models
• - Technicolor

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Chiral SB in QCD

• SU(2)L x SU(2)R ? SU(2)V , vev 90
  MeV

EWSB
SU(2)L x SU(2)R ? SU(2)V , vev 246
GeV
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LEP ee-, Ecm 209 GeV Tevatron pp, Ecm 2
000 GeV, L 1 fb-1 LHC pp, Ecm 14 000 GeV,
L 100 fb-1 ILC ee-, Ecm 1 000 GeV, L
200 fb-1 CLIC ee-, Ecm 3-5 000 GeV, L 200
fb-1
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WL WL ? WL WL WL WL ? t t t t ? t t
L i gp M? /v (p- ?µ p - p ?µ p-) ?0µ
gV t ?µ t ?0µ gA t ?µ ?5 t ?0µ
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• International Linear Collider ee- at 1 TeV

ee ? ?tt ? WW tt ee ? ?tt ? tt tt
ee ? WW ee ? tt
ee ? ?? WW
ee ? ?? tt
Large Hadron Collider pp at 14 TeV
pp ? ?tt ? WW tt pp ? ?tt ? tt tt
pp ? WW pp ? tt
pp ? jj WW
pp ? jj tt
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Chiral effective Lagrangian SU(2)L x SU(2)R
global, SU(2)L x U(1)Y local

L Lkin - v2 Tr Aµ Aµ - a v2 /4 Tr(?µ
i g'' ?µ . t/2 )2 - ?L u u M ?R
h.c. ?L i ?µ (?µ Wµ i g/6
Yµ) ?L ?R i ?µ (?µ Yµ i g/6
Yµ) ?R b1 ?L i ?µ (u?µ u ?µ
u i g/6 Yµ) u ?L b2 ?R Pb i ?µ (u
?µ u ?µ u i g/6 Yµ) u Pb ?R
?1 ?L i ?µ u Aµ ?5 u ?L ?2 ?R
P? i ?µ u Aµ ?5 u P? ?R ?2 ?R P?
i ?µ u (?µ ?µ) u P? ?R
BESS
Our model
Minimal model Standard Model with
Higgs replaced with ?
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A simple Lagrangian

• L i gp M? /v (p- ?µ p - p ?µ p- )?0µ
• gV t ?µ t ?0µ gA t ?µ ?5 t
  ?0µ

Chiral effective Lagrangian
L - v2 Tr Aµ Aµ - a v2 /4 Tr(?µ i g''
?µ . t/2 )2 b1 IbL b2 IbR ...

gp M? /(2 v g'') gV g'' b2 /4
gA (b1 0) M? va v g''/2
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Unitarity constraints

• WL WL ? WL WL , WL WL ? t t, t t ? t t

gp 1.75 (M? 700 GeV) gV 1.7 (M?
700 GeV)
Low energy constraints
g 10 ? gp 0.2 M? (TeV) b2
?2 0.04 ? gV g b2 / 4
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Subset of fusion diagrams approximations
(Pythia)
Full calculation of 66 diagrams at tree level
(CompHEP)
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Pythia vs CompHEP

• ? (M 700 GeV, G 12.5 GeV, g
  20, b2 0.08)
• Before cuts
• vs (GeV) 800
  1000 1500
• Pythia (fb) 0.35
  0.95 3.27
• CompHEP (fb) 0.66
  1.16 3.33

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Backgrounds (Pythia)

• ee- ? tt ?
• ee- ? ee- tt
• s(0.8 TeV) 300.3 1.3 fb ? 0.13 fb
  (0.20 fb)
• s(1.0 TeV) 204.9 2.4 fb ? 0.035 fb
  (0.16 fb)

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S/vB
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e- e ? t t
?
different from Higgs !
? (M 700 GeV, b20.08, g20)
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Search at Hadron Colliders
Tevatron p p ? t t sS 1.2 fb
sB 8 306 fb LHC p p ? t t
sS 22.7 fb sB 752 000 fb
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Search at LHC pp ? W W t t
g g ? WW tt 39 diagrams u u ? WW tt 131
diagrams d d ? WW tt 131 diagrams
Signal s(gg) 10.2 fb ? 1.0 fb
Cuts 650 lt mWW lt 750 GeV pT gt 100
GeV y lt 2
R gt 5
Background s(gg) 10.6 fb ?
0.6 fb s(uu) 2.4 fb ? 0.1 fb
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Conclusions

• New strong ?-resonance model
• ? in ee- ? ??tt R values up to 8
• ee- ? tt sensitive probe of mt physics,
• Lscan 1 fb-1 (preliminary)
• pp ? W W t t R gt 5 (preliminary !)