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Paper   IPM / Particles / 11562
School of Particles and Accelerator
  Title:   First Measurement of the Cross Section for Top-Quark Pair Production in Proton-Proton Collisions at sqrt(s)=7 TeV
  Author(s): 
1 . Hessamaddin 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: Phys. Lett. B
  Vol.:  695
  Year:  2011
  Pages:   424-443
  Supported by:  IPM
  Abstract:
The first measurement of the cross section for top-quark pair production in pp collisions at the LHC at center-of-mass energy sqrt(s)= 7 TeV has been performed using 3.1 0.3 inverse pb of data recorded by the CMS detector. This result utilizes the final state with two isolated, highly energetic charged leptons, large missing transverse energy, and two or more jets. Backgrounds from Drell-Yan and non-W/Z boson production are estimated from data. Eleven events are observed in the data with 2.1 1.0 events expected from background. The measured cross section is 194 72 (stat.) 24 (syst.) 21 (lumi.) pb, consistent with next-to-leading order predictions.

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