Measurement of top quark polarization in top-antitop events from proton-proton collisions at sqrt(s) = 7 TeV using the ATLAS detector

This Letter presents measurements of the polarization of the top quark in top-antitop quark pair events, using 4.7 fb^-1 of proton-proton collision data recorded with the ATLAS detector at the Large Hadron Collider at sqrt(s) = 7 TeV. Final states containing one or two isolated leptons (electrons or...

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Veröffentlicht in:	Physical review letters 2013-07, Vol.111
Hauptverfasser:	Aad, G., Albrand, S., Brown, J., Buat, Q., Clement, B., Collot, J., Crépé-Renaudin, S., Dechenaux, B., Delemontex, T., Delsart, P.A., Gabaldon, C., Genest, M.H., Hostachy, J.Y., Laisne, E., Le, B.T., Ledroit-Guillon, F., Lleres, A., Lucotte, A., Malek, F., Monini, C., Stark, J., Sun, X., Trocmé, B., Rahal, G., Alio, L., Barbero, M., Bee, C.P., Bertella, C., Bousson, N., Clémens, J.C., Coadou, Y., Djama, F., Etienne, F., Feligioni, L., Hoffmann, D., Hubaut, F., Knoops, E. B. F. G., Le Guirriec, E., Li, B., Maurer, J., Monnier, E., Nagai, Y., Odier, J., Pralavorio, P., Rozanov, A., Serre, T., Talby, M., Tannoury, N., Tiouchichine, E., Tisserant, S., Toth, J., Touchard, F., Ughetto, M., Vacavant, L., Boumediene, D., Busato, Emmanuel, Calvet, D., Calvet, S., Donini, J., Dubreuil, E., Ghodbane, N., Gris, Ph, Guicheney, C., Liao, H., Pallin, D., Paredes Hernández, Daniela, Podlyski, F., Santoni, C., Theveneaux-Pelzer, Timothée, Valery, Loïc, Vazeille, F., Abdel Khalek, S., Augé, E., Binet, S., Bourdarios, C., de La Taille, C., de Vivie de Regie, J.B., Duflot, L., Escalier, M., Fayard, L., Fournier, D., Grivaz, J.-F., Guillemin, T., Henrot-Versillé, S., Hrivnac, J., Iconomidou-Fayard, L., Idarraga, J., Kado, M., Lorenzo Martinez, N., Lounis, A., Makovec, N., Niedercorn, F., Poggioli, L., Puzo, P., Renaud, A., Rousseau, D., Rybkin, G., Sauvan, J.B., Schaarschmidt, J., Schaffer, A.C.
Format:	Artikel
Sprache:	eng
Schlagworte:	High Energy Physics - Experiment Physics
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Zusammenfassung:	This Letter presents measurements of the polarization of the top quark in top-antitop quark pair events, using 4.7 fb^-1 of proton-proton collision data recorded with the ATLAS detector at the Large Hadron Collider at sqrt(s) = 7 TeV. Final states containing one or two isolated leptons (electrons or muons) and jets are considered. Two measurements of alpha_l P, the product of the leptonic spin-analyzing power and the top quark polarization, are performed assuming that the polarization is introduced by either a CP conserving (CPC) or a CP violating (CPV) production process. The measurements obtained, alpha_l P_CPC = -0.035 +/- 0.014 (stat) +/- 0.037 (syst) and alpha_l P_CPV = 0.020 +/- 0.016 (stat) +0.013 -0.017 (syst), are in good agreement with the Standard Model prediction of negligible top quark polarization.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.111.232002