Studies of diboson production using CMS

1
Studies of di-boson production using CMS Keti
Kaadze, Kansas State University, USA On behalf
of CMS collaboration, CERN, Switzerland

• CMS Detector
• Proton-Proton collider
• vs 14 TeV
• Luminosity 1034 cm-2s-1
• Crossing Rate 40 MHz

HCAL
Muon chamber

• Signal Significance and cross section
• Perform toy experiments
• Generate number of
• signal and background events
• Vary expected number of signal and background
  events within
• systematic uncertainty. We use NLO WZ cross
  section of 50 pb, calculated with MCFM4, to
  normalize expected number of signal events
• Measure significance for each try
• and estimate 68 and 95
• confidence level regions
• ? 5s significance can be achieved
• with lt 350 pb-1 of integrated
• luminosity5.
• Cross section Measurement
• Cross section is measured for each
• channel as follows, normalized by value
• obtained from MC truth expectations

References 1 A. Belyaev et al. CERN LHC
signatures of new gauge bosons in the minimal
Higgsless Model, Phys. Rev. D78 031701(R)
(2208) 2 K.Lane, S. Mrenna The Collider
Phenomenology of technihadrons in the technicolor
Straw Man Model, Phys. Rev. D67, 115011 (2003),
hep-ph/0210299. 3 CMS collaboration
Measuring Electron Efficiencies with early
Data, CMS PAS EGM-07-001 (2007) 4 J.M.
Campbell, R.K. Ellis MCFM v4.1. A Monte Carlo
for FeMtobarn processes at hadron colliders. 5
CMS collaboration Study of the process
pp?WZ?l?ll at CMS, CMS PAS EWK-08-003