1. Prospects for TeV Scale New Physics at LHC
Reisaburo Tanaka
(Okayama University)
On behalf of ATLAS-Japan
KEK Theory Meeting 2006
March 2-4, 2006

2. Prospects for TeV Scale New Physics at LHC
3. Higgs
Precision measurements at LHC
Top quark mass ΔMtop
W boson mass ΔMW 
Very challenging !
Magnetic filed or momentum resolution
ΔB/B(or Δp/p) < 0.02%,
Tracker Material known to < 1% etc.
LEP EW working group, Summer 2005
Tevatron
RUN-I
RUN-II
LHC
178.04.3GeV
1.3 GeV
1 GeV
Tevatron + LEP
Tevatron
RUN-II
LHC
80.410±0.032GeV
17 MeV
10 MeV
Prospects for TeV Scale New Physics at LHC

3. Prospects for TeV Scale New Physics at LHC
Limit on the Higgs mass
Mtop
Indirect limit
indirect
excluded
direct
LEP direct limit
Prospects for TeV Scale New Physics at LHC

4. Prospects for TeV Scale New Physics at LHC
SM Higgs discovery potential
L=30fb-1 >8σsignificance
（MH>114GeV:LEP limit)
S.Asai et al., Eur.Phys.J.direct C32 Suppl. 2 (2004) 19
Light Higgs　VBF・Hττ
Heavy Higgs VBF・HWＷ
Multiple discovery modes for MH<200GeV
MH>200GeV
H→ZZ→４lepton
(gold plated) >20σ
VBF
WW(*)
L=10fb-1 > 5σ
　→　Discovery after
1year LHC RUN
ZZ(*) 
ttH
Prospects for TeV Scale New Physics at LHC

5. ＭSSM Higgs discovery potential
5 Higgs bosons h,H,A,H±
Descrive mA and tanβ at tree level.
Larege bbH/A coupling at large tanβ
　H/A→ττ, μμ, bb
　μμ channel is important at the beginning of LHC
　∵ Commissioning μμ＜ττ＜＜bb
Can observe charged Higgs
via gbtH- at tanβ>10 　
Cover whole (mA, tan) plane
for MSSM Higgs
with L=30fb-1 data
Observe only h similar to HＳＭ.
Prospects for TeV Scale New Physics at LHC

6. Prospects for TeV Scale New Physics at LHC
Little Higgs
Higgs is a pseudo-Goldstone boson
from global symmetry breaking.
Higgs acquires a mass radiatively
at the EW scale v.
→ quadratic divergences absent
at one-loop level.
Goldstone bosons →　
Heavy Gauge Bosons
WH, ZH, H ~ 1 TeV
Heavy Top quark
T ~ 1 TeV
Triplet Higgs
φ, φ, φ0 ~ 10 TeV
N.Arkani-Hamed et al., Phys.Lett.B513(2001)232
JHEP07(2002)034, ibid. 08(2002)021
Review:
M. Schmaltz, Nucl.Phys.B(Proc.Suppl.)117(2003)40
F. del Aguila et al., Acta Phys.Polon.B35(2004)2767
Little Higgs signal at LHC
Heavy top TtZ, bW
G. Azuelos et al., hep-ph/ , Eur.Phys.J.C39S2(2005)13-244
Prospects for TeV Scale New Physics at LHC

7. Prospects for TeV Scale New Physics at LHC
Higgsless Model
C. Csáki et al.,
Phys.Rev.D69(2004)055006,
Phys.Rev.Lett.92(2004)101802 R
Warped extra dim
size R, factor k
Our 4D brane
Planck brane
fermions
Gauge bosons also propagate
in extra dim
Gauge group in 5D : SU(2)L×SU(2)R ×U(1)
Different boundaries conditions on branes break SU(2)×U(1) to U(1) : No Higgs needed.
Z and Z' are KK excitations of the neutral gauge field.
but strong constraints from EW precision data …
Collider phenomenology:
H. Davoudiasl et al.,Phys.Rev.D70(2004)015006
T.G. Rizzo, hep-ph/
Prospects for TeV Scale New Physics at LHC