Evidence for spin correlation in ttbar production

Evidence for spin correlation in ttbar production

We present a measurement of the ratio of events with correlated t and tbar spins to the total number of ttbar events. This ratio f is evaluated using a matrix-element-based approach in events with a single lepton (electron or muon) and at least four jets. We analyze ppbar collisions data correspondi...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Physical review letters 2012, Vol.108
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., Aoki, M., Askew, A., Asman, B., Atkins, S., Atramentov, O., Augsten, K., 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., Bean, A., Begalli, 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., 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., Chapon, E., Chen, G., Chevalier-Théry, S., Cho, D.K., Cho, S.W., Choi, S. K., Choudhary, B., 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., Demina, R., Denisov, D., Denisov, S.P., Desai, 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:We present a measurement of the ratio of events with correlated t and tbar spins to the total number of ttbar events. This ratio f is evaluated using a matrix-element-based approach in events with a single lepton (electron or muon) and at least four jets. We analyze ppbar collisions data corresponding to an integrated luminosity of 5.3 fb^-1 collected with the D0 detector at the Fermilab Tevatron collider operating at a center of mass energy $\sqrt{s}=1.96$ TeV. Combining this result with a recent measurement of f in dilepton final states, we find f in agreement with the standard model. In addition, the combination provides evidence for the presence of spin correlation in ttbar events with a significance of more than three standard deviations.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.108.032004