Determination of the top-quark pole mass and strong coupling constant from the ttbar production cross section in pp collisions at sqrt(s) = 7 TeV

Determination of the top-quark pole mass and strong coupling constant from the ttbar production cross section in pp collisions at sqrt(s) = 7 TeV

The inclusive cross section for top-quark pair production measured by the CMS experiment in proton-proton collisions at a center-of-mass energy of 7 TeV is compared to the QCD prediction at next-to-next-to-leading order with various parton distribution functions to determine the top-quark pole mass,...

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Veröffentlicht in:Physics letters. B 2014, Vol.728, p.496-517
Hauptverfasser: Chatrchyan, S., Besançon, M., Couderc, F., 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., 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., Brom, J.-M., Chabert, E.C., Collard, C., Conte, E., Drouhin, F., Fontaine, J.-C., Gele, D., Goerlach, U., Goetzmann, C., Juillot, P., Le Bihan, A.-C., van Hove, P., Gadrat, S., Beauceron, S., Beaupere, N., 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., Vander Donckt, M., Verdier, P., Viret, S.
Format: Artikel
Sprache:eng
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High Energy Physics - Experiment
Physics
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Zusammenfassung:The inclusive cross section for top-quark pair production measured by the CMS experiment in proton-proton collisions at a center-of-mass energy of 7 TeV is compared to the QCD prediction at next-to-next-to-leading order with various parton distribution functions to determine the top-quark pole mass, mtpole, or the strong coupling constant, alphaS. With the parton distribution function set NNPDF2.3, a pole mass of 176.7+3.8-3.4 GeV is obtained when constraining alphaS at the scale of the Z boson mass, mZ, to the current world average. Alternatively, by constraining mtpole to the latest average from direct mass measurements, a value of alphaS(mZ) = 0.1151+0.0033-0.0032 is extracted. This is the first determination of alphaS using events from top-quark production.
ISSN:0370-2693
DOI:10.1016/j.physletb.2014.08.040