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Paper   IPM / Particles / 11895
School of Particles and Accelerator
  Title:   Measurement of the tt production cross section and the top quark mass in the dilepton channel in pp collisions at sqrt(s) = 7 TeV
  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: JHEP
  No.:  049
  Vol.:  1107
  Year:  2011
  Supported by:  IPM
  Abstract:
The tt production cross section and top quark mass are measured in proton-proton collisions at sqrt(s)= 7 TeV in a data sample corresponding to an integrated luminosity of 36 pb (-1)collected by the CMS experiment. The measurements are performed in events with two leptons (electrons or muons) in the final state. Results of the cross section measurement in events with and without b-quark identification are obtained and combined. The measured value is stat = 168+-18 (stat.)+-14 (syst.)+-7 (lumi.) pb, consistent with predictions from the standard model. The top quark mass mtop is reconstructed with two different methods, a full kinematic analysis and a matrix weighting technique. The combination yields a measurement of mtop = 175.5 +-4.6 (stat.) +-4.6 (syst.) GeV/c(2)

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