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Paper   IPM / Particles / 11900
School of Particles and Accelerator
  Title:   Measurement of the tt Production Cross Section in pp Collisions at sqrt(s) = 7 TeV using the Kinematic Properties of Events with Leptons and Jets
1.  Hessamadin Arfaei
2.  Hamed Bakhshiansohi
3.  Seyed Mohsen Etesami
4.  Ali Fahim
5.  Majid Hashemi
6.  Abideh Jafari
7.  Mohsen Khakzad
8.  A Mohammadi
9.  Mojtaba Mohammadi Najafabadi
10.  Saeid Paktinat Mehdiabadi
11.  Batool Safarzadeh
12.  Maryam Zeinali
  Status:   Published
  Journal: Eur. Phys. J. C
  No.:  1721
  Vol.:  71
  Year:  2011
  Supported by:  IPM
A measurement of the tt production cross section in proton-proton collisions at a centre-of-mass energy of 7 TeV has been performed at the LHC with the CMS detector. The analysis uses a data sample corresponding to an integrated luminosity of 36 pb(-1) and is based on the reconstruction of the final state with one isolated, high transverse-momentum electron or muon and three or more hadronic jets. The kinematic properties of the events are used to separate the t?t signal from W+jets and QCD multijet background events. The measured cross section is 173(+39)(-32)(stat. + syst.) pb, consistent with standard model expectations

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