Chiral tensors

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Based on arXiv0801.4235 hep-ph (in Phys. Atom.
Nucl.) arXiv0807.5087 hep-ph
Search for excited spin-1 bosons
keywords Z-prime, Z-star
M. V. Chizhov (Sofia University) V. A. Bednyakov
and J. A. Budagov (Joint Institute for Nuclear
Research)
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Excited particles
e why not Z ?
Z has different interactions than Z !
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EW physics
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Extension of the SM
or
From Tevatron constraints M gt 1 TeV
we assume that L M 1 TeV g is SU(2)L
coupling
Phys. Rev. Lett. 99 171802 (2007)
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Invariant di-lepton mass distributions
Z
Z
Z
MZ
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Angular distributions
dL,R
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Lepton angular distributions (Collins-Soper frame)
Z
Z swallowtail shape
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Z and graviton angular distributions
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Lepton transverse momentum distributions
Z
Z
Z
N.B. Difficult detection of W
MZ /2
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In the case that such bosons will be observed as
resonance peaks above the Z boson tail in the
invariant dilepton mass distribution, we suggest
to investigate in addition two more
experimentally accessible distributions already
on the early stage of the LHC data-taking.
These are the differential distributions as
functions of a transverse momentum of the lepton
and the CollinsSoper angle.
All these distributions are related to the spin
properties of the new boson and should play
crucial role in the analysis of their
interactions.
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17s discovery
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Lepton transverse momentum distributions
3s difference
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Lepton angular distributions in the Collins-Soper
frame (centre-edge asymmetry ACE)
G. Gounaris et al., Int. J. Mod. Phys. A 8 (1993)
3285.
7s difference
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Discovery potential for L100/pb _at_ 10 TeV
Detailed simulations within the ATLAS framework
will be performed by Dubna group
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excited bosons
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The Fast Physics LHC Discovery Menu
Model Mass reach Luminosity (fb-1) Early Systematic Challenges
Contact Interaction ? lt 2.8 TeV 0.01 Jet Eff., Energy Scale
Z ALRM SSM LRM E6, SO(10) M 1 TeV M 1 TeV M 1 TeV M 1 TeV 0.01 0.02 0.03 0.03 0.1 Alignment
Excited Quark M 0.7 3.6 TeV 0.1 Jet Energy Scale
Axigluon or Colouron M 0.7 3.5 TeV 0.1 Jet Energy Scale
E6 diquarks M 0.7 4.0 TeV 0.1 Jet Energy Scale
Technirho M 0.7 2.4 TeV 0.1 Jet Energy Scale
ADD Virtual GKK MD 4.3 - 3 TeV, n 3-6 MD 5 - 4 TeV, n 3-6 0.1 1 Alignment
ADD Direct GKK MD 1.5-1.0 TeV, n 3-6 0.1 MET, Jet/photon Scale
SUSY JetMET0 lepton JetMET1 lepton JetMET2 leptons M 1.5 1.8 TeV M 0.5 TeV M 0.5 TeV M 0.5 TeV 1 0.01 0.1 0.1 MET, Jet Energy Scale, Multi-Jet backgrounds, Standard Model backgrounds
mUED M 0.3 TeV M 0.6 TeV 0.01 1 ibid
TeV-1 (ZKK(1)) Mz1 lt 5 TeV 1
RS1 di-jets di-muons MG10.7- 0.8 TeV, c0.1 MG10.8- 2.3 TeV, c0.01-0.1 0.1 1 Jet Energy Scale Alignment
excited bosons
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Conclusions on Search for excited spin-1 bosons

• There are intense searches for excited fermions,
  but not for excited bosons. We propose to fill
  this gap.
• In contrast to the gauge bosons the excited
  bosons have anomalous couplings to matter. This
  leads to a distinctive signature of their
  production at the hadron colliders.
• The clearest channel for their discovery at the
  LHC should be the dilepton one.
• Dubna group plans to perform corresponding
  detailed simulations within the ATLAS framework.
  (NOTE 04/12/2008)

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Dubna group ALREADY has detailed simulations
within the ATLAS framework!
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Z -boson Dubna ATLAS Validation !!!
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