Measurement of spin correlation in ttbar production using dilepton final states

We measure the correlation between the spin of the top quark and the spin of the anti-top quark in (ttbar -> W+ W- b bbar -> l+ nu b l- nubar bbar) final states produced in ppbar collisions at a center of mass energy sqrt(s)=1.96 TeV, where l is an electron or muon. The data correspond to an i...

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Veröffentlicht in:	Physics letters. B 2011-03, Vol.702, p.16-23
Hauptverfasser:	Abazov, V.M., Abbott, B., Acharya, B.S., Adams, M., Adams, T., Alexeev, G.D., Alkhazov, G., Alton, A., Alverson, G., Alves, G.A., Ancu, L.S., Aoki, M., Arov, M., Askew, A., Asman, B., Atramentov, O., Avila, C., Backusmayes, J., Badaud, F., Bagby, L., Baldin, B., Bandurin, D.V., Banerjee, S., Barberis, E., Baringer, P., Barreto, J., Bartlett, J.F., Bassler, U., Bazterra, V., Beale, S., Bean, A., Begalli, M., Begel, M., Belanger-Champagne, C., Bellantoni, L., Beri, S.B., Bernardi, G., Bernhard, R., Bertram, I., Besançon, M., Beuselinck, R., Bezzubov, V.A., Bhat, P.C., Bhatnagar, V., Blazey, G., Blessing, S., Bloom, K., Boehnlein, A., Boline, D., Bolton, T.A., Boos, E.E., Borissov, G., Bose, T., Brandt, A., Brandt, O., Brock, R., Brooijmans, G., Bross, A., Brown, D., Brown, J., Bu, X.B., Buehler, M., Buescher, V., Bunichev, V., Burdin, S., Burnett, T.H., Buszello, C.P., Calpas, B., Camacho-Pérez, E., Carrasco-Lizarraga, M.A., Casey, B.C.K., Castilla-Valdez, H., Chakrabarti, S., Chakraborty, D., Chan, K.M., Chandra, A., Chen, G., Chevalier-Théry, S., Cho, D.K., Cho, S.W., Choi, S. K., Choudhary, B., Christoudias, T., Cihangir, S., Claes, D., Clutter, J., Cooke, M., Cooper, W.E., Corcoran, M., Couderc, F., Cousinou, M.-C., Croc, A., Cutts, D., Das, A., Davies, G., De, K., de Jong, S.J., de La Cruz-Burelo, E., Déliot, F., Demarteau, M.
Format:	Artikel
Sprache:	eng
Schlagworte:	ELECTRONS Experiment-HEP FERMILAB TEVATRON FORECASTING High Energy Physics - Experiment HYPOTHESIS LEPTONS LUMINOSITY Physics PHYSICS OF ELEMENTARY PARTICLES AND FIELDS PRODUCTION QUANTUM CHROMODYNAMICS QUARKS SPIN T QUARKS
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Zusammenfassung:	We measure the correlation between the spin of the top quark and the spin of the anti-top quark in (ttbar -> W+ W- b bbar -> l+ nu b l- nubar bbar) final states produced in ppbar collisions at a center of mass energy sqrt(s)=1.96 TeV, where l is an electron or muon. The data correspond to an integrated luminosity of 5.4 fb-1 and were collected with the D0 detector at the Fermilab Tevatron collider. The correlation is extracted from the angles of the two leptons in the t and tbar rest frames, yielding a correlation strength C= 0.10^{+0.45}_{-0.45}, in agreement with the NLO QCD prediction within two standard deviations, but also in agreement with the no correlation hypothesis.
ISSN:	0370-2693
DOI:	10.1016/j.physletb.2011.05.077