Measurement of the top-antitop production cross section in the tau+jets channel in pp collisions at sqrt(s) = 7 TeV

The top-quark pair production cross section in 7 TeV centre-of-mass proton proton collisions is measured using data collected by the CMS detector at the LHC. The measurement uses events with one jet identified as a hadronically-decaying tau lepton and at least four additional energetic jets, at leas...

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Published in:The European physical journal. C, Particles and fields Particles and fields, 2013, Vol.73
Main Authors: Chatrchyan, S., Besançon, M., Choudhury, S., Dejardin, M., Denegri, D., Fabbro, B., Faure, J.L., Ferri, F., Ganjour, S., Givernaud, A., Gras, P., Hamel de Monchenault, G., Jarry, P., Locci, E., Malcles, J., Millischer, L., Nayak, A., Rander, J., Rosowsky, A., Titov, M., Baffioni, S., Beaudette, F., Benhabib, L., Bianchini, L., Bluj, M., Busson, Pierre, Charlot, C., Daci, N., Dahms, T., Dalchenko, M., Dobrzynski, L., Florent, A., Granier de Cassagnac, R., Haguenauer, M., Mine, P., Mironov, C., Naranjo, I.N., Nguyen, M., Ochando, C., Paganini, P., Sabes, D., Salerno, R., Sirois, Y., Veelken, C., Zabi, A., Agram, J.-L., Andrea, J., Bloch, D., Bodin, D., Brom, J.-M., Cardaci, M., Chabert, E.C., Collard, C., Conte, E., Drouhin, F., Fontaine, J.-C., Gele, D., Goerlach, U., Juillot, P., Le Bihan, A.-C., van Hove, P., Beauceron, S., Beaupere, N., Bondu, O., Boudoul, G., Brochet, S., Chasserat, J., Chierici, R., Contardo, D., Depasse, P., El Mamouni, H., Fay, J., Gascon, S., Gouzevitch, M., Ille, B., Kurca, T., Lethuillier, M., Mirabito, L., Perries, S., Sgandurra, L., Sordini, V., Tschudi, Y., Verdier, P., Viret, S.
Format: Article
Language:English
Subjects:
High Energy Physics - Experiment
Physics
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Summary:The top-quark pair production cross section in 7 TeV centre-of-mass proton proton collisions is measured using data collected by the CMS detector at the LHC. The measurement uses events with one jet identified as a hadronically-decaying tau lepton and at least four additional energetic jets, at least one of which is identified as coming from a b quark. The analysed data sample corresponds to an integrated luminosity of 3.9 inverse femtobarns recorded by a dedicated multijet plus hadronically-decaying tau trigger. A neural network has been developed to separate the top-quark pairs from the W+jets and multijet backgrounds. The measured value of sigma(ttbar) = 152 +/- 2 (stat.) +/- 32 (syst.) +/- 3 (lum.) pb is consistent with the standard model predictions.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-013-2386-x