Measurement of spin correlations in t-tbar production using the matrix element method in the muon+jets final state in pp collisions at sqrt(s) = 8 TeV

Measurement of spin correlations in t-tbar production using the matrix element method in the muon+jets final state in pp collisions at sqrt(s) = 8 TeV

The consistency of the spin correlation strength in top quark pair production with the standard model (SM) prediction is tested in the muon+jets final state. The events are selected from pp collisions, collected by the CMS detector, at a centre-of-mass energy of 8 TeV, corresponding to an integrated...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Physics letters. B 2016, Vol.758, p.321-346
Hauptverfasser: Khachatryan, V., Besançon, M., Couderc, F., Dejardin, M., Denegri, D., Fabbro, B., Faure, J.L., Favaro, C., Ferri, F., Ganjour, S., Givernaud, A., Gras, P., Monchenault, G. Hamel De, Jarry, P., Locci, E., Machet, M., Malcles, J., Rander, J., Rosowsky, A., Titov, M., Zghiche, A., Antropov, I., Baffioni, S., Beaudette, F., Busson, P., Cadamuro, L., Chapon, E., Charlot, C., Dahms, T., Davignon, O., Filipovic, N., Florent, A., Granier de Cassagnac, R., Lisniak, S., Mastrolorenzo, L., Mine, P., Naranjo, I.N., Nguyen, M., Ochando, C., Ortona, G., Paganini, P., Pigard, P., Regnard, S., Salerno, R., Sauvan, J.B., Sirois, Y., Strebler, T., Yilmaz, Y., Zabi, A., Agram, J.-L., Andrea, J., Aubin, A., Bloch, D., Brom, J.-M., Buttignol, M., Chabert, E.C., Chanon, N., Collard, C., Conte, E., Coubez, X., Fontaine, J.-C., Gele, D., Goerlach, U., Goetzmann, C., Bihan, A.-C. Le, Merlin, J.A., Skovpen, K., Hove, P. Van, Gadrat, S., Beauceron, S., Bernet, C., Boudoul, G., Bouvier, E., Montoya, C.A. Carrillo, Chierici, R., Contardo, D., Courbon, B., Depasse, P., Mamouni, H. El, Fan, J., Fay, J., Gascon, S., Gouzevitch, M., Ille, B., Lagarde, Fabienne, Laktineh, I.B., Lethuillier, M., Mirabito, L., Pequegnot, A.L., Perries, S., Alvarez, J.D. Ruiz, Sabes, D., Sgandurra, L., Sordini, V., Donckt, M. Vander, Verdier, P., Viret, S.
Format: Artikel
Sprache:eng
Schlagworte:
High Energy Physics - Experiment
Physics
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:The consistency of the spin correlation strength in top quark pair production with the standard model (SM) prediction is tested in the muon+jets final state. The events are selected from pp collisions, collected by the CMS detector, at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 inverse-femtobarns. The data are compared with the expectation for the spin correlation predicted by the SM and with the expectation of no correlation. Using a template fit method, the fraction of events that show SM spin correlations is measured to be 0.72 +/- 0.08 (stat) +0.15 -0.13 (syst), representing the most precise measurement of this quantity in the lepton+jets final state to date.
ISSN:0370-2693
DOI:10.1016/j.physletb.2016.05.005