Measurement of the cross section ratio σttbb/σttjj in pp collisions at √s = 8 TeV

Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Bergauer, T. and Filipovic, Nicolas and Bencze, György and Hajdú, Csaba and Hidas, Pál and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Karancsi, János and Molnár, József and Pálinkás, József and Trócsányi, Zoltán and Ujvári, Balázs and Veres, Gábor (2015) Measurement of the cross section ratio σttbb/σttjj in pp collisions at √s = 8 TeV. PHYSICS LETTERS B, 746. pp. 132-153. ISSN 0370-2693

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Abstract

The first measurement of the cross section ratio σttbb/σttjj is presented using a data sample corresponding to an integrated luminosity of 19.6 fb−1 collected in pp colli- sions at √s = 8 TeV with the CMS detector at the LHC. Events with two leptons (e or μ) and four reconstructed jets, including two identified as b quark jets, in the final state are selected. The ratio is determined for a minimum jet transverse momentum pT of both 20 and 40 GeV/c. The measured ratio is 0.022 ± 0.003 (stat) ± 0.005 (syst) for pT > 20 GeV/c. The absolute cross sections σttbb and σttjj are also measured. The measured ratio for pT > 40 GeV/c is compatible with a theoretical quantum chromo- dynamics calculation at next-to-leading order.

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