Search for a New Vector Resonance in the pp WWtt X Channel at LHC - PowerPoint PPT Presentation

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Search for a New Vector Resonance in the pp WWtt X Channel at LHC

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Search for a New Vector Resonance in the pp WWtt X Channel at LHC ... Modified BESS model -- the only non SM particle. Respects the symmetries of the SM Higgs sector: ... – PowerPoint PPT presentation

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Title: Search for a New Vector Resonance in the pp WWtt X Channel at LHC


1
Search for a New Vector Resonance in the pp
WWttX Channel at LHC
September 2006
  • M. Gintner, I. Melo, B. Trpišová
  • University of Žilina

2
Motivation
An alternative to the SM Higgs boson Strong
Electroweak Symmetry Breaking
A new strong vector resonance as an isospin
triplet ( )
3
The Model
Modified BESS model -- the only non SM
particle
Respects the symmetries of the SM Higgs sector
local,
global
lt
gt
0.1
10


coupling constants of the original BESS
coupling constant
GeV electroweak scale
4
Analysis of pp
For the dominant gg channel
  • cross-sections and statistical
    significance
  • CompHEP
  • reconstruction
  • CompHEP events generation
  • Pythia decay and hadronization
  • Atlfast detector effects and
    reconstruction of the jets
  • ROOT, C -- event reconstruction

5
39(8) diagrams in the dominant gg channel
No resonance background
?
?
?
6
CompHEP Results
? M?700 GeV, G?4 GeV, b20.08, g
10

GeV
Cuts
0.96 fb 39 diagrams
0.037 fb No 39 diagrams
R

46 39 diagrams

7
l jjbjjbjj Reconstruction
40 of events
One charged lepton channel
Cuts
of electron gt 30 GeV
muon gt 20 GeV
jets gt 25 GeV
GeV
mass of the W
50
b-tagging efficiency
Reconstruction criterion
8
Invariant mass of the WW pair
number of events/17 GeV
9
39 diagrams
8 diagrams
Mass of the W boson
Lum100/fb
Lum100/fb
12.2 events
2.4 events
number of events/0.6 GeV
number of events/0.6 GeV
Mass of the top quark
Lum100/fb
Lum100/fb
12.2 events
2.4 events
number of events/2.5 GeV
number of events/2.5 GeV
10
Conclusions
GeV, g10, 0.08
For the resonance with
I.
in the final state maximum values of R at
around 100
II.
reconstruction
The top quark and the W reconstruction O.K. The ?
reconstruction 40 of events fall into the ?
peak? need to improve the reconstruction
algorithm
III. Future work -- -- much
larger cross-section compared to
, i.e. larger numbers of events
11
versus
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