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Evidence for spin correlation in ttbar production

V.M. Abazov B. Abbott B.S. Acharya M. Adams T. Adams G.D. Alexeev G. Alkhazov A. Alton G. Alverson G.A. Alves M. Aoki A. Askew B. Asman S. Atkins O. Atramentov K. Augsten C. Avila J. Backusmayes F. Badaud 1 L. Bagby B. Baldin D.V. Bandurin S. Banerjee E. Barberis P. Baringer J. Barreto J.F. Bartlett U. Bassler 2 V. Bazterra A. Bean M. Begalli C. Belanger-Champagne L. Bellantoni S.B. Beri G. Bernardi 3 R. Bernhard I. Bertram M. Besançon 2 R. Beuselinck V.A. Bezzubov P.C. Bhat V. Bhatnagar G. Blazey S. Blessing K. Bloom A. Boehnlein D. Boline E.E. Boos G. Borissov T. Bose A. Brandt O. Brandt R. Brock G. Brooijmans A. Bross D. Brown 3 J. Brown 3 X.B. Bu M. Buehler V. Buescher V. Bunichev S. Burdin T.H. Burnett C.P. Buszello B. Calpas 4 E. Camacho-Pérez M.A. Carrasco-Lizarraga B.C.K. Casey H. Castilla-Valdez S. Chakrabarti D. Chakraborty K.M. Chan A. Chandra E. Chapon 2 G. Chen S. Chevalier-Théry 2 D.K. Cho S.W. Cho S. Choi B. Choudhary S. Cihangir D. Claes J. Clutter M. Cooke W.E. Cooper M. Corcoran F. Couderc 2 M.-C. Cousinou 4 A. Croc 2 D. Cutts A. Das G. Davies K. De S.J. de Jong E. de la Cruz-Burelo F. Déliot 2 R. Demina D. Denisov S.P. Denisov S. Desai C. Deterre 2 K. Devaughan H.T. Diehl M. Diesburg P.F. Ding A. Dominguez T. Dorland A. Dubey L.V. Dudko D. Duggan A. Duperrin 4 S. Dutt A. Dyshkant M. Eads D. Edmunds J. Ellison V.D. Elvira Y. Enari H. Evans A. Evdokimov V.N. Evdokimov G. Facini T. Ferbel F. Fiedler F. Filthaut W. Fisher H.E. Fisk M. Fortner H. Fox S. Fuess A. Garcia-Bellido G.A Garcıa-Guerra V. Gavrilov Pascal Gay 1 W. Geng 4 D. Gerbaudo C.E. Gerber Y. Gershtein G. Ginther G. Golovanov A. Goussiou P.D. Grannis S. Greder 5 H. Greenlee Z.D. Greenwood E.M. Gregores G. Grenier 6 Ph. Gris 1 J.-F. Grivaz 7 A. Grohsjean 2 S. Grünendahl M.W. Grünewald T. Guillemin 7 G. Gutierrez P. Gutierrez A. Haas S. Hagopian J. Haley L. Han K. Harder A. Harel J.M. Hauptman J. Hays T. Head T. Hebbeker D. Hedin H. Hegab A.P. Heinson U. Heintz C. Hensel I. Heredia-de la Cruz K. Herner G. Hesketh M.D. Hildreth R. Hirosky T. Hoang J.D. Hobbs B. Hoeneisen M. Hohlfeld Z. Hubacek 2 V. Hynek I. Iashvili Y. Ilchenko R. Illingworth A.S. Ito S. Jabeen M. Jaffré 7 D. Jamin 4 A. Jayasinghe R. Jesik K. Johns M. Johnson A. Jonckheere P. Jonsson J. Joshi A.W. Jung A. Juste K. Kaadze E. Kajfasz 4 D. Karmanov P.A. Kasper I. Katsanos R. Kehoe S. Kermiche 4 N. Khalatyan A. Khanov A. Kharchilava Y.N. Kharzheev J.M. Kohli A.V. Kozelov J. Kraus S. Kulikov A. Kumar A. Kupco T. Kurca 6 V.A. Kuzmin J. Kvita S. Lammers G. Landsberg P. Lebrun 6 H.S. Lee S.W. Lee W.M. Lee J. Lellouch 3 L. Li Q.Z. Li S.M. Lietti J.K. Lim D. Lincoln J. Linnemann V.V. Lipaev R. Lipton Yehan Liu A. Lobodenko M. Lokajicek R. Lopes de Sa H.J. Lubatti R. Luna-Garcia A.L. Lyon A.K.A. Maciel D. Mackin R. Madar 2 R. Magana-Villalba S. Malik V.L. Malyshev Y. Maravin J. Martınez-Ortega R. Mccarthy C.L. Mcgivern M.M. Meijer A. Melnitchouk D. Menezes P.G. Mercadante M. Merkin A. Meyer J. Meyer F. Miconi 5 N.K. Mondal G.-S. Muanza 4 M. Mulhearn E. Nagy 4 M. Naimuddin M. Narain R. Nayyar H.A. Neal J.P. Negret P. Neustroev S.F. Novaes T. Nunnemann G. Obrant J. Orduna N. Osman 4 J. Osta G.J. Otero y Garzon M. Padilla A. Pal N. Parashar V. Parihar S.K. Park R. Partridge N. Parua A. Patwa B. Penning M. Perfilov Y. Peters K. Petridis G. Petrillo P. Pétroff 7 R. Piegaia M.-A. Pleier P.L.M. Podesta-Lerma V.M. Podstavkov P. Polozov A.V. Popov M. Prewitt D. Price N. Prokopenko J. Qian A. Quadt B. Quinn M.S. Rangel K. Ranjan P.N. Ratoff I. Razumov P. Renkel M. Rijssenbeek I. Ripp-Baudot 5 F. Rizatdinova M. Rominsky A. Ross C. Royon 2 P. Rubinov R. Ruchti G. Safronov G. Sajot 8 P. Salcido A. Sanchez-Hernandez M.P. Sanders B. Sanghi A.S. Santos G. Savage L. Sawyer T. Scanlon R.D. Schamberger Y. Scheglov H. Schellman T. Schliephake S. Schlobohm C. Schwanenberger R. Schwienhorst J. Sekaric H. Severini E. Shabalina V. Shary 2 A.A. Shchukin R.K. Shivpuri V. Simak V. Sirotenko P. Skubic P. Slattery D. Smirnov K.J. Smith G.R. Snow J. Snow S. Snyder S. Söldner-Rembold L. Sonnenschein K. Soustruznik J. Stark 8 V. Stolin D.A. Stoyanova M. Strauss D. Strom L. Stutte L. Suter P. Svoisky M. Takahashi A. Tanasijczuk M. Titov 2 V.V. Tokmenin Y.-T. Tsai K. Tschann-Grimm D. Tsybychev B. Tuchming 2 C. Tully L. Uvarov S. Uvarov S. Uzunyan R. van Kooten W.M. van Leeuwen N. Varelas E.W. Varnes I.A. Vasilyev P. Verdier 6 L.S. Vertogradov M. Verzocchi M. Vesterinen D. Vilanova 2 P. Vokac H.D. Wahl M.H.L.S. Wang J. Warchol G. Watts M. Wayne M. Weber L. Welty-Rieger A. White D. Wicke M.R.J. Williams G.W. Wilson M. Wobisch D.R. Wood T.R. Wyatt Y. Xie R. Yamada W.-C. Yang T. Yasuda Y.A. Yatsunenko Z. Ye H. Yin K. Yip S.W. Youn J. Yu T. Zhao B. Zhou J. Zhu M. Zielinski D. Zieminska L. Zivkovic N. Huske 3
Abstract : 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.
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V.M. Abazov, B. Abbott, B.S. Acharya, M. Adams, T. Adams, et al.. Evidence for spin correlation in ttbar production. Physical Review Letters, American Physical Society, 2012, 108, pp.032004. ⟨10.1103/PhysRevLett.108.032004⟩. ⟨in2p3-00634051⟩

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