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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
  Author(s): 
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
  Abstract:
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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