Measurement of associated production of vector bosons and top quark-antiquark pairs at sqrt(s) = 7 TeV
(2013) Physical Review Letters — Vol. 110, n° 17, p. 172002 [15 pages] (2013)
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- Abstract
- The first measurement of vector-boson production associated with a top quark-antiquark pair in proton-proton collisions at √s=7 TeV is presented. The results are based on a data set corresponding to an integrated luminosity of 5.0 fb-1, recorded by the CMS detector at the LHC in 2011. The measurement is performed in two independent channels through a trilepton analysis of tt̅ Z events and a same-sign dilepton analysis of tt̅ V (V=W or Z) events. In the trilepton channel a direct measurement of the tt̅ Z cross section σtt̅ Z=0.28-0.11+0.14 (stat)-0.03+0.06 (syst) pb is obtained. In the dilepton channel a measurement of the tt̅ V cross section yields σtt̅ V=0.43-0.15+0.17 (stat)-0.07+0.09 (syst) pb. These measurements have a significance, respectively, of 3.3 and 3.0 standard deviations from the background hypotheses and are compatible, within uncertainties, with the corresponding next-to-leading order predictions of 0.137-0.016+0.012 and 0.306-0.053+0.031 pb.
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CMS Collaboration, Quertenmont, L., Basegmez, S., Bruno, G., Castello, R., Ceard, L., Delaere, C., Du Pree, T., Favart, D., Forthomme, L., Giammanco, A., Hollar, J., Lemaitre, V., Liao, J., Militaru, O., Nuttens, C., Pagano, D., Pin, A., Piotrzkowski, K., et al. (2013). Measurement of associated production of vector bosons and top quark-antiquark pairs at sqrt(s) = 7 TeV. Physical Review Letters, 110(17), 172002 [15 pages]. https://doi.org/10.1103/PhysRevLett.110.172002 (Original work published 2013)