Search for T, T e e,

1
Search for ?T, ?T! e e-, ??-
Search for ?T, ?T! ee- Greg Landsberg Meenakshi
Narain Search for ?T, ?T ! ??- John
Butler Ryan Hooper

• Particles predicted by the Low Scale Technicolor
  Model
• TCSM - Eichten, Lane and Womersley
• TCSM2 - K. Lane hep-ph/9903372

2
Low Scale Technicolor Phenomenology

• Technicolor Models requiring large number of
  technifermion doublets
• Topcolor-assisted Technicolor
• Walking Technicolor
• Low Scale Technicolor Phenomenology
• color singlet vectors (200 400 GeV)
• produced in pp collisions
• Decays
• color-singlet scalars
• lightest technihadrons pT0 pT/-
• Decays
• Cross section for depends on two main model
  parameter choices
• Difference in the ?T and ?T mass
• The mass parameter MVMAMT, which controls the
  rate of ?!??T

• wT ? gpT r0T ?pT pT r_T ? pT
  pT
• ? gZ ?WpT , ZpT ? WpT,ZpT
• ? 3pT ?WW ? WZ
• ? f f, g g ? f f, g g
  

pT ? ff,gg (pT0 ? bb, pT/- ? bc dominate)
3
RunI Results

• PRL analysis by Heintz and Narain

Difference in ?T and ?T mass
Vary mass parameter MVMAMT
4
Search for Technicolor to Dielectrons

• Search for rT/wT ? ee- as a bump/excess at high
  dielectron mass
• Analysis based on Landsberg, Perez LED and Z
  searches
• Use identical cuts ? same data events and same
  background estimates
• Intrinsic widths of ?T,?T are about 0.5 GeV
• Thus resonance width dominated by detector
  resolution
• Optimized mass dependent cut window for this
  particular search

5
Dielectron Analysis
6
Dielectron Analysis
Blue curves m(?T)-m(?T)60 GeV Magenta
curves m(?T)-m(?T)100 GeV
For a given set Uppsermost curve MT500
GeV Middle curve MT200 GeV Lowermost curve MT
100 GeV
7
Limits from dielectron Channel

• 95 C.L.
• m(?T ,?T)-m(?T)60 GeV
• m(?T) gt 367 GeV for MT 500 GeV
• m(?T) gt 340 GeV for MT 100 GeV
• m(?T ,?T)-m(?T)100 GeV
• m(?T ,?T) gt 355 GeV for MT 500 GeV
• m(?T ,?T) gt 240 GeV for MT 100 GeV
• Compare to RunI
• m(?T ,?T)-m(?T)60 GeV
• m(?T ,?T) gt 250 GeV for MT 100 GeV
• m(?T)-m(?T)100 GeV
• m(?T ,?T) gt 230 GeV for MT 400 GeV
• m(?T ,?T) gt 206 GeV for MT 100 GeV

8
Search for Technicolor to Dimuons

• Search for rT/wT ? mm- as a bump/excess at high
  mm mass
• Motivation identical to the dielectron search
• Analysis based on Ryan Hoopers LED and Z
  searches (DØ notes 4229 4230) updated for a 250
  pb-1 data set
• Use identical cuts ? same data events and same
  background estimates
• pT gt 15 GeV
• Cut on (h1 h2) to remove cosmics
• hdet lt 2
• TC mass dependent cut window

9
Search for Technicolor to Dimuons

• Acceptance Efficiency
• Pythia 6.220 implementation of TCSM
• Generated 100k events for each mass point
• pm smeared using pmcs prescription (DØ note 4297)
• Use Ryans
• Map in h-f for Acce
• pT re-weighting procedure
• 1 overall error assumed
• Results
• For MT 100 GeV and (rT - pT) 60 GeV, exclude
  masses lt 240 GeV
• Exceeds the Run I ee limit
• First in dimuons for DØ
• Combine with the ee limit

10
Conclusion

• We have performed a search for ?T, ?T! e e-,
  ??-
• We have extended the limit significantly in the
  dielectron final state. The best results so far.
• Sent to group/EB for review
• We have a new analysis in the dimuon final state
• We combined the limit for the two final states
• Will be writing this up shortly and sending to
  the group/EB for review.