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Measurement of spin correlation in ttbar production using dilepton final states

V.M. Abazov B. Abbott B.S. Acharya M. Adams T. Adams G.D. Alexeev G. Alkhazov A. Alton G. Alverson G.A. Alves L.S. Ancu M. Aoki M. Arov A. Askew B. Asman O. Atramentov C. Avila J. Backusmayes F. Badaud 1 L. Bagby B. Baldin D.V. Bandurin S. Banerjee E. Barberis P. Baringer J. Barreto 2 J.F. Bartlett U. Bassler 3 V. Bazterra S. Beale A. Bean M. Begalli M. Begel C. Belanger-Champagne L. Bellantoni S.B. Beri G. Bernardi 4 R. Bernhard I. Bertram M. Besançon 3 R. Beuselinck V.A. Bezzubov P.C. Bhat V. Bhatnagar G. Blazey S. Blessing K. Bloom A. Boehnlein D. Boline T.A. Bolton E.E. Boos G. Borissov T. Bose A. Brandt O. Brandt R. Brock G. Brooijmans A. Bross D. Brown 4 J. Brown 4 X.B. Bu M. Buehler V. Buescher V. Bunichev S. Burdin T.H. Burnett C.P. Buszello B. Calpas 5 E. Camacho-Pérez M.A. Carrasco-Lizarraga B.C.K. Casey H. Castilla-Valdez S. Chakrabarti D. Chakraborty K.M. Chan A. Chandra G. Chen S. Chevalier-Théry 3 D.K. Cho S.W. Cho S. Choi B. Choudhary T. Christoudias S. Cihangir D. Claes J. Clutter M. Cooke W.E. Cooper M. Corcoran F. Couderc 3 M.-C. Cousinou 5 A. Croc 3 D. Cutts A. Das G. Davies K. De S.J. de Jong E. de la Cruz-Burelo F. Déliot 3 M. Demarteau R. Demina D. Denisov S.P. Denisov S. Desai K. Devaughan H.T. Diehl M. Diesburg A. Dominguez T. Dorland A. Dubey L.V. Dudko D. Duggan A. Duperrin 5 S. Dutt A. Dyshkant M. Eads D. Edmunds J. Ellison V.D. Elvira Y. Enari 4 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 T. Gadfort A. Garcia-Bellido V. Gavrilov Pascal Gay 1 W. Geist 6 W. Geng 5 D. Gerbaudo C.E. Gerber Y. Gershtein G. Ginther G. Golovanov A. Goussiou P.D. Grannis S. Greder 6 H. Greenlee Z.D. Greenwood E.M. Gregores G. Grenier 7 Ph. Gris 1 J.-F. Grivaz 8 A. Grohsjean 3 S. Grünendahl M.W. Grünewald T. Guillemin F. Guo 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 3 N. Huske 4 V. Hynek I. Iashvili R. Illingworth A.S. Ito S. Jabeen M. Jaffré 8 D. Jamin 5 A. Jayasinghe R. Jesik K. Johns M. Johnson D. Johnston A. Jonckheere P. Jonsson J. Joshi A. Juste K. Kaadze E. Kajfasz 5 D. Karmanov P.A. Kasper I. Katsanos R. Kehoe S. Kermiche 5 N. Khalatyan A. Khanov A. Kharchilava Y.N. Kharzheev D. Khatidze M.H. Kirby J.M. Kohli A.V. Kozelov J. Kraus S. Kulikov A. Kumar A. Kupco T. Kurca 7 V.A. Kuzmin J. Kvita S. Lammers G. Landsberg P. Lebrun 7 H.S. Lee S.W. Lee W.M. Lee J. Lellouch 4 L. Li Q.Z. Li S.M. Lietti J.K. Lim D. Lincoln J. Linnemann V.V. Lipaev R. Lipton Yehan Liu Z. 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 3 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 6 N.K. Mondal G.-S. Muanza 5 M. Mulhearn E. Nagy 5 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 5 J. Osta G.J. Otero y Garzon M. Padilla A. Pal M. Pangilinan N. Parashar V. Parihar S.K. Park J. Parsons R. Partridge N. Parua A. Patwa B. Penning M. Perfilov K. Peters Y. Peters K. Petridis G. Petrillo P. Pétroff 8 R. Piegaia J. Piper M.-A. Pleier P.L.M. Podesta-Lerma V.M. Podstavkov M.-E. Pol P. Polozov A.V. Popov M. Prewitt D. Price N. Prokopenko S. Protopopescu J. Qian A. Quadt B. Quinn M.S. Rangel K. Ranjan P.N. Ratoff I. Razumov P. Renkel M. Rijssenbeek I. Ripp-Baudot 6 F. Rizatdinova M. Rominsky A. Ross C. Royon 3 P. Rubinov R. Ruchti G. Safronov G. Sajot 9 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 3 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 9 V. Stolin D.A. Stoyanova M. Strauss D. Strom L. Stutte L. Suter P. Svoisky M. Takahashi A. Tanasijczuk W. Taylor M. Titov 3 V.V. Tokmenin Y.-T. Tsai D. Tsybychev B. Tuchming 3 C. Tully P.M. Tuts L. Uvarov S. Uvarov S. Uzunyan R. van Kooten W.M. van Leeuwen N. Varelas E.W. Varnes I.A. Vasilyev P. Verdier 7 L.S. Vertogradov M. Verzocchi M. Vesterinen D. Vilanova 3 P. Vint 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 C. Xu S. Yacoob R. Yamada W.-C. Yang T. Yasuda Y.A. Yatsunenko Z. Ye H. Yin K. Yip S.W. Youn J. Yu S. Zelitch T. Zhao B. Zhou J. Zhu M. Zielinski D. Zieminska L. Zivkovic
1 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
2 IPNO - Institut de Physique Nucléaire d'Orsay
3 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
4 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
5 CPPM - Centre de Physique des Particules de Marseille
6 IPHC - Institut Pluridisciplinaire Hubert Curien
7 IPNL - Institut de Physique Nucléaire de Lyon
8 LAL - Laboratoire de l'Accélérateur Linéaire
9 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
Abstract : 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.
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Submitted on : Thursday, March 10, 2011 - 9:01:33 AM
Last modification on : Sunday, June 20, 2021 - 3:34:56 AM

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IN2P3 | DRS-IPHC | IPNO | LPC-CLERMONT | LPSC | CNRS | CPPM | LAL | UPMC | IPHC | UNIV-AMU | PRES_CLERMONT | DSM-IRFU | CEA | UNIV-LYON1 | CEA-DRF | SITE-ALSACE | SORBONNE-UNIVERSITE | UNIV-PARIS7 | USPC | IP2I | UDL | UNIV-PARIS | GEPI | UP-SCIENCES | UGA | SU-TI | LPNHE | SU-SCIENCES

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V.M. Abazov, B. Abbott, B.S. Acharya, M. Adams, T. Adams, et al.. Measurement of spin correlation in ttbar production using dilepton final states. Physics Letters B, Elsevier, 2011, 702, pp.16-23. ⟨10.1016/j.physletb.2011.05.077⟩. ⟨in2p3-00575278⟩

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