First Measurement of the Cross Section for Top-Quark Pair Production in Proton-Proton Collisions at $$\sqrt{s}=7$$ TeV

Journal Article · Sat Jan 01 00:00:00 EST 2011 · Physical Letter B

DOI:https://doi.org/10.1016/j.physletb.2010.11.058· OSTI ID:1155715

Khachatryan, Vardan ^[1]

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1. Yerevan Physics Inst. (Armenia)

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 {\pm} 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 {\pm} 1.0 events expected from background. The measured cross section is 194 {\pm} 72 (stat.) {\pm} 24 (syst.) {\pm} 21 (lumi.) pb, consistent with next-to-leading order predictions.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: CMS Collaboration
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1155715
• Report Number(s): FERMILAB-PUB-10-707-CMS; arXiv eprint number arXiv:1010.5994
• Journal Information: Physical Letter B, Vol. 695, Issue 5
• Country of Publication: United States
• Language: English

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