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Phys Rev Lett. 2011 Jul 15;107(3):032001. Epub 2011 Jul 14.

Measurement of spin correlation in tt production using a matrix element approach.

Abazov VM, Abbott B, Acharya BS, Adams M, Adams T, Alexeev GD, Alkhazov G, Alton A, Alverson G, Alves GA, Ancu LS, Aoki M, Arov M, Askew A, Åsman B, Atramentov O, Avila C, BackusMayes J, Badaud F, Bagby L, Baldin B, Bandurin DV, Banerjee S, Barberis E, Baringer P, Barreto J, Bartlett JF, Bassler U, Bazterra V, Beale S, Bean A, Begalli M, Begel M, Belanger-Champagne C, Bellantoni L, Beri SB, Bernardi G, Bernhard R, Bertram I, Besançon M, Beuselinck R, Bezzubov VA, Bhat PC, Bhatnagar V, Blazey G, Blessing S, Bloom K, Boehnlein A, Boline D, Boos EE, Borissov G, Bose T, Brandt A, Brandt O, Brock R, Brooijmans G, Bross A, Brown D, Brown J, Bu XB, Buehler M, Buescher V, Bunichev V, Burdin S, Burnett TH, Buszello CP, Calpas B, Camacho-Pérez E, Carrasco-Lizarraga MA, Casey BC, Castilla-Valdez H, Chakrabarti S, Chakraborty D, Chan KM, Chandra A, Chen G, Chevalier-Théry S, Cho DK, Cho SW, Choi S, Choudhary B, Cihangir S, Claes D, Clutter J, Cooke M, Cooper WE, Corcoran M, Couderc F, Cousinou MC, Croc A, Cutts D, Das A, Davies G, De K, de Jong SJ, De la Cruz-Burelo E, Déliot F, Demarteau M, Demina R, Denisov D, Denisov SP, Desai S, Deterre C, DeVaughan K, Diehl HT, Diesburg M, Dominguez A, Dorland T, Dubey A, Dudko LV, Duggan D, Duperrin A, Dutt S, Dyshkant A, Eads M, Edmunds D, Ellison J, Elvira VD, Enari Y, Evans H, Evdokimov A, Evdokimov VN, Facini G, Ferbel T, Fiedler F, Filthaut F, Fisher W, Fisk HE, Fortner M, Fox H, Fuess S, Garcia-Bellido A, Gavrilov V, Gay P, Geng W, Gerbaudo D, Gerber CE, Gershtein Y, Ginther G, Golovanov G, Goussiou A, Grannis PD, Greder S, Greenlee H, Greenwood ZD, Gregores EM, Grenier G, Gris P, Grivaz JF, Grohsjean A, Grünendahl S, Grünewald MW, Guillemin T, Guo F, Gutierrez G, Gutierrez P, Haas A, Hagopian S, Haley J, Han L, Harder K, Harel A, Hauptman JM, Hays J, Head T, Hebbeker T, Hedin D, Hegab H, Heinson AP, Heintz U, Hensel C, Heredia-De la Cruz I, Herner K, Hesketh G, Hildreth MD, Hirosky R, Hoang T, Hobbs JD, Hoeneisen B, Hohlfeld M, Hubacek Z, Huske N, Hynek V, Iashvili I, Illingworth R, Ito AS, Jabeen S, Jaffré M, Jamin D, Jayasinghe A, Jesik R, Johns K, Johnson M, Johnston D, Jonckheere A, Jonsson P, Joshi J, Jung AW, Juste A, Kaadze K, Kajfasz E, Karmanov D, Kasper PA, Katsanos I, Kehoe R, Kermiche S, Khalatyan N, Khanov A, Kharchilava A, Kharzheev YN, Khatidze D, Kirby MH, Kohli JM, Kozelov AV, Kraus J, Kulikov S, Kumar A, Kupco A, Kurča T, Kuzmin VA, Kvita J, Lammers S, Landsberg G, Lebrun P, Lee HS, Lee SW, Lee WM, Lellouch J, Li L, Li QZ, Lietti SM, Lim JK, Lincoln D, Linnemann J, Lipaev VV, Lipton R, Liu Y, Liu Z, Lobodenko A, Lokajicek M, Lopes de Sa R, Lubatti HJ, Luna-Garcia R, Lyon AL, Maciel AK, Mackin D, Madar R, Magaña-Villalba R, Malik S, Malyshev VL, Maravin Y, Martínez-Ortega J, McCarthy R, McGivern CL, Meijer MM, Melnitchouk A, Menezes D, Mercadante PG, Merkin M, Meyer A, Meyer J, Miconi F, Mondal NK, Muanza GS, Mulhearn M, Nagy E, Naimuddin M, Narain M, Nayyar R, Neal HA, Negret JP, Neustroev P, Novaes SF, Nunnemann T, Obrant G, Orduna J, Osman N, Osta J, Otero y Garzón GJ, Padilla M, Pal A, Parashar N, Parihar V, Park SK, Parsons J, Partridge R, Parua N, Patwa A, Penning B, Perfilov M, Peters K, Peters Y, Petridis K, Petrillo G, Pétroff P, Piegaia R, Piper J, Pleier MA, Podesta-Lerma PL, Podstavkov VM, Polozov P, Popov AV, Prewitt M, Price D, Prokopenko N, Protopopescu S, Qian J, Quadt A, Quinn B, Rangel MS, Ranjan K, Ratoff PN, Razumov I, Renkel P, Rijssenbeek M, Ripp-Baudot I, Rizatdinova F, Rominsky M, Ross A, Royon C, Rubinov P, Ruchti R, Safronov G, Sajot G, Salcido P, Sánchez-Hernández A, Sanders MP, Sanghi B, Santos AS, Savage G, Sawyer L, Scanlon T, Schamberger RD, Scheglov Y, Schellman H, Schliephake T, Schlobohm S, Schwanenberger C, Schwienhorst R, Sekaric J, Severini H, Shabalina E, Shary V, Shchukin AA, Shivpuri RK, Simak V, Sirotenko V, Skubic P, Slattery P, Smirnov D, Smith KJ, Snow GR, Snow J, Snyder S, Söldner-Rembold S, Sonnenschein L, Soustruznik K, Stark J, Stolin V, Stoyanova DA, Strauss M, Strom D, Stutte L, Suter L, Svoisky P, Takahashi M, Tanasijczuk A, Taylor W, Titov M, Tokmenin VV, Tsai YT, Tsybychev D, Tuchming B, Tully C, Uvarov L, Uvarov S, Uzunyan S, Van Kooten R, van Leeuwen WM, Varelas N, Varnes EW, Vasilyev IA, Verdier P, Vertogradov LS, Verzocchi M, Vesterinen M, Vilanova D, Vokac P, Wahl HD, Wang MH, Warchol J, Watts G, Wayne M, Weber M, Welty-Rieger L, White A, Wicke D, Williams MR, Wilson GW, Wobisch M, Wood DR, Wyatt TR, Xie Y, Xu C, Yacoob S, Yamada R, Yang WC, Yasuda T, Yatsunenko YA, Ye Z, Yin H, Yip K, Youn SW, Yu J, Zelitch S, Zhao T, Zhou B, Zhu J, Zielinski M, Zieminska D, Zivkovic L; D0 Collaboration.

Abstract

We determine the fraction of tt events with spin correlation, assuming that the spin of the top quark is either correlated with the spin of the top antiquark as predicted by the standard model or is uncorrelated. For the first time we use a matrix-element-based approach to study tt spin correlation. We use tt → W+ b W- b → ℓ+ νbℓ- ν b final states produced in pp collisions at a center-of-mass energy sqrt(s)=1.96  TeV, where ℓ denotes an electron or a 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 result agrees with the standard model prediction. We exclude the hypothesis that the spins of the tt are uncorrelated at the 97.7% C.L.

PMID:
21838349
[PubMed]
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