Measurement of top quark polarisation in t-channel single top quark production

A bstract A first measurement of the top quark spin asymmetry, sensitive to the top quark polarisation, in t -channel single top quark production is presented. It is based on a sample of pp collisions at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.7 fb −1 . A hig...

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Veröffentlicht in:	The journal of high energy physics 2016-04, Vol.2016 (4), p.1-42
Hauptverfasser:	Alderweireldt, S., Blekman, F., Yonamine, R., Zhang, F., Benucci, L., Bruno, G., Pin, A., Alves, G. A., Malbouisson, H., Pavlov, B., Petkov, P., Spiezia, A., Cabrera, A., Attikis, A., Raidal, M., Faure, J. L., Heister, A., Kuessel, Y., Costanza, F., Perrey, H., Placakyte, R., Vanhoefer, A., Berger, J., Lobelle Pardo, P., Horvath, D., Ujvari, B., Kalsi, A. K., Behnamian, H., Abbrescia, M., Radogna, R., Robutti, E., Tosi, S., Gerosa, R., Checchia, P., Torassa, E., Santocchia, A., Foà, L., Del Re, D., Organtini, G., Kim, H., Kim, J. H., Vazquez Valencia, F., Romanowska-Rybinska, K., Varela, J., Vavilov, S., Tlisov, D., Dudko, L., Kalinin, A., Redondo, I., de Trocóniz, J. F., Vizan Garcia, J. M., Calderon, A., Breuker, H., Dabrowski, A., De Roeck, A., Dordevic, M., Dorney, B., Kousouris, K., Lucchini, M. T., Stieger, B., Treille, D., Bachmair, F., Dissertori, G., Adiguzel, A., Coughlan, J. A., Burton, D., Khan, A., Symonds, P., Hatakeyama, K., Ferapontov, A., Richman, J., Pierini, M., Chatterjee, A., Eggert, N., Bauerdick, L. A. T., Gottschalk, E., Jung, A. W., Lopes De Sá, R., McBride, P., Merkel, P., Vidal, R., Konigsberg, J., Evdokimov, O., Blumenfeld, B., Xiao, M., Benelli, G., Busza, W., Zhukova, V., Fangmeier, C., Odell, N., Pollack, B., Velasco, M., Reinsvold, A., Kotov, K., Elmer, P., Sun, J., Galanti, M., Khukhunaishvili, A., Mueller, R., Mohapatra, A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Asymmetry Classical and Quantum Gravitation Collisions Compatibility Cross sections Elementary Particles High Energy Physics - Experiment Luminosity Magnetic properties Particle spin Physics Physics and Astronomy Quantum Field Theories Quantum Field Theory Quantum Physics Quarks Regular Article - Experimental Physics Relativity Theory String Theory
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Zusammenfassung:	A bstract A first measurement of the top quark spin asymmetry, sensitive to the top quark polarisation, in t -channel single top quark production is presented. It is based on a sample of pp collisions at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.7 fb −1 . A high-purity sample of t -channel single top quark events with an isolated muon is selected. Signal and background components are estimated using a fit to data. A differential cross section measurement, corrected for detector effects, of an angular observable sensitive to the top quark polarisation is performed. The differential distribution is used to extract a top quark spin asymmetry of 0.26 ± 0.03(stat) ± 0.10(syst), which is compatible with a p -value of 4.6% with the standard model prediction of 0.44.
ISSN:	1029-8479 1029-8479
DOI:	10.1007/JHEP04(2016)073