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Measurement of the tt¯ production cross section in pp collisions at 7 TeV in lepton+jets events using b-quark jet identification

Abstract: A new measurement of the inclusive production cross section for pp ! tt is performed at a center-ofmass energy of 7 TeV using data collected by the CMS experiment at the LHC. The analysis uses a data sample corresponding to an integrated luminosity of 36 pb1, and is based on the final state with one isolated, high transverse momentum muon or electron, missing transverse energy, and hadronic jets. The tt content of the selected events is enhanced by requiring the presence of at least one jet consistent with b-quark hadronization. The measured cross section is 150 9ðstatÞ 17ðsystÞ 6ðlumiÞ pb and is in agreement with higher-order QCD calculations. The combination of this measurement with a previous CMS result based on dileptons gives 154 17ðstat þ systÞ 6ðlumiÞ pb.

Authorship: Chatrchyan S., Khachatryan V., Sirunyan A.M., Tumasyan A., Adam W., Bergauer T., Dragicevic M., Erö J., Fabjan C., Friedl M., Frühwirth R., Ghete V.M., Hammer J., Hänsel S., Hoch M., Hörmann N., Hrubec J., Jeitler M., Kiesenhofer W., Krammer M., Liko D., Mikulec I., Pernicka M., Rahbaran B., Rohringer H., Schöfbeck R., Strauss J., Taurok A., Teischinger F., Wagner P., Waltenberger W., Walzel G., Widl E., Wulz C.E., Mossolov V.,

Fuente: Physical Review D - Particles, Fields, Gravitation and Cosmology, 2011, 84(9), 092004

Publisher: American Physical Society

Publication date: 01/11/2011

No. of pages: 24

Publication type: Article

DOI: 10.1103/PhysRevD.84.092004

ISSN: 1550-7998,1550-2368,2470-0010,2470-0029

Publication Url: https://doi.org/10.1103/PhysRevD.84.092004

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