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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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