Measurement of spin correlation in tt̄ production using dilepton final states
VM M. Abazov,Brad K. Abbott,Bobby Samir Acharya,M. R. Adams,Todd Adams, G. D. Alexeev,G. D. Alkhazov,Anrew Alton,George O. Alverson,Gelio A. Alves, L. S. Ancu,Masahiko Aoki,Mikhail Arov, A. Askew,B. Å Åsman, O. V. Atramentov,C. Ávila,J. BackusMayes,Frédérique Badaud,L. Bagby,Boris Yu Baldin,Dmitry V. Bandurin,Sw W. Banerjee,Emanuela Barbëris,Philip S. Baringer,J. L. Barreto,J. F. Bartlett,Ursula Bassler,Víctor E. Bazterra,S. Beale,Alice Bean,Márcia Begalli,Michael Begel,Camille Bèlanger-Champagne,Leo Bellantoni,Suman B. Beri,Gregorio Bernardi,Ralf P. Bernhard,Iain A. Bertram,Marc Besançon,R. Beuselinck,V. A. Bezzubov,Priya C. Bhat,V. Bhatnagar,Gerald C. Blazey,Susan K. Blessing,Kenneth Bloom,Amber Boehnlein,Daniel Boline,Tim A. Bolton,Ernst E. Boos,Guennadi Borissov,Tulika Bose,Achi E. Brandt,O. Brandt,Raymond J. Brock,Gustaaf Brooijmans,Alan D. Bross,David N. Brown,James A. Brown,X. B. Bu,Marc Buehler,V. Buescher,Viacheslav E. Bunichev, Sebastien Burdin,TH Burnett,Claus P. Buszello,B. Calpas,Enrique Camacho-Pérez,M. A. Carrasco-Lizarraga,Brendan C K Casey,H. Castilla-Valdez,Subhendu K. Chakrabarti,Dhiman Chakraborty,Kai M A Chan,Avdhesh Chandra,Guomeng Chen,S. Chevalier-Théry,D. K. Cho,S. W. Cho,Seungryul Choi,Brajesh Chandra Choudhary,T. Christoudias,Selçuk Cihangir,Dan R. Claes,J. Clutter,Michael Cooke,W. E. Cooper,Marjorie D. Corcoran,F. Couderc,M. C. Cousinou,A. Croc,David Ćutts,Aron C. Das,Gavin J. Davies,Kaushik De,Sijbrand J. De Jong,Eduard De La De La Cruz-Burelo,Frédéric Déliot,Marcel Demarteau,Regina F. Démina,D. S. Denisov,Sergey P. Denisov,Satish V. Desai,Kayle DeVaughan,H. Thomas Diehl, M. Diesburg,Aaron Domínguez, T. Dorland,Anand Kumar Dubey,L. V. Dudko,Daniel Duggan,Arnaud Duperrin,S. Dutt,Alexander S. Dyshkant,Michael Eads,Daniel L. Edmunds,John A. Ellison,V. Daniel Elvira,Yuji Enari,Harold G. Evans,A. V. Evdokimov,V. N. Evdokimov,Gabriel J. Facini, T. Ferbel,Frank Fiedler,Frank Filthaut,Wade C. Fisher,H. Eugene Fisk, Michael R. Fortner,Howard S. Fox,Stuart Fuess,Thomas Gadfort,Arán García-Bellido,V. B. Gavrilov,Pascal Gay,Walter M. Geist,Weihua Geng, D. Gerbaudo,Cecilia E. Gerber,Yu S. Gershtein,G. Ginther,Georgy A. Golovanov,A. G. Goussiou,Paul D. Grannis,S. Greder,Herbert B. Greenlee,Zeno Dixon Greenwood,E. De Moraes Gregores,Gérald J. Grenier,Ph L Y Gris,Jean François Grivaz,Alexander Grohsjean,Stefan Grünendahl,Martin W. Grünewald,Thibault Guillemin,Fanglu Guo,Gaston Gutiérrez,Phillip Gutierrez,Andrew Haas,Stephanie L. Hagopian,Joy E. Haley,Liang Han,Kristian U. Harder,Amnon Harel,John M. Hauptman,Jonathan Hays,Timothy L. Head, Thomas Hebbeker,David Hedin,H. Hegab,Ann P. Heinson,Ulrich Heintz,Carsten Hensel,I. Heredia De La Heredia De La Cruz,Ken R. Herner,G. G. Hesketh,Mike D. Hildreth,Robert J. Hirosky,T. Hoang,John D. Hobbs,B. Hoeneisen,Marc Hohlfeld,Zdenek Hubacek,N. K. Huske, V. Hynek, I. Iashvili,Robert Illingworth,A. S. Ito,Shabnam Jabeen,Marc Olivier Jaffré,D. O. Jamin,A. Jayasinghe,Rick Jesik,Ken A. Johns,Marvin E. Johnson,David T. Johnston,A. M. Jonckheere,Per M. Jönsson,Jyoti Joshi,Aurelio Juste, K. Kaadze,Eric Kajfasz,D. E. Karmanov,Peter A. Kasper,I. Katsanos,Robert L. Kehoe,S. Kermiche,Norik S. Khalatyan,Alexandre I. Khanov,Avto I. Kharchilava,Yu N. Kharzheev,D. Khatidze,Michael H. Kirby, J. M. Kohli,A. V. Kozelov,James A. Kraus,S. A. Kulikov,Arun K Rhine Kumar,Alexander Kupčo,Tibor Kurča,Vadim A. Kuzmin,Jiří Kvita, S. Lammers,Greg L. Landsberg,Paul L G Lebrun,H. S. Lee,Sungwon Lee,William Lee,J. Lellouch, Lei Li,Qizhong Li,S. M. Lietti,J. K. Lim,Don W. Lincoln,James T. Linnemann,V. V. Lipaev,Ronald J. Lipton,Yong Liü,Zhen Liu,A. A. Lobodenko,Miloš V. Lokajíček,R. Lopes De Sa, H. J. Lubatti,René Luna Luna-García,Adam L. Lyon,Arthur K A MacIel,Dennis Mackin,R. Madar,R. Magaña Villalba,Sudhir K R Malik, V. L. Malyshev,Yurii Y. Maravin,J. Martínez-Ortega,Robert L. McCarthy,C. L. McGivern,M. M. Meijer,Alex Melnitchouk,Débora Peres Menezes,Pedro G. Mercadante,M. M. Merkin,Arnd B. Meyer,Jörg P. Meyer,F. Miconi,Naba Kumar Mondal,G. S. Muanza,M. J. Mulhearn,Elemér Nagy,Md D. Naimuddin,Meenakshi Narain,Ruchika Nayyar,Homer A. Neal,J. P. Negret,P. Neustroev,S. F. Novaes,Thomas Nunnemann,G. Z. Obrant,Jesus Orduna,N. Osman,J. Osta,G. J O Otero Y Garzón,M. Padilla,Amit Kumar Pal,Monica Pangilinan,Neeti D. Parashar,Vivek Parihar,Sungkeun Park,John A. Parsons,Richard A. Partridge,Nirmalya Parua,Amit N. Patwa,B. Penning,M. A. Perfilov,Klaus J. Peters,Yvonne Peters,Konstantinos A. Petridis,Gianluca Petrillo,Pierre Pétroff, R. Piegaia,J. Piper,Marc André Pleier,P. Podesta M Podesta Podesta-Lerma,Vladimir M. Podstavkov,M. E. Pol,P. A. Polozov,A. V. Popov,M. Prewitt,Darren D. Price,N. N. Prokopenko,Serban D. Protopopescu,Jun Qian,Arnulf Quadt,Breese Quinn, Murilo S. Rangel,Kirti Ranjan,Peter N. Ratoff,I. Razumov,Peter Renkel,Michael Rijssenbeek,Isabelle Ripp-Baudot, F. K. Rizatdinova,Mandy Rominsky,Anthony Joseph Ross,Christophe R. Royon, P. Rubinov,Randal C. Ruchti,Gennady A. Safronov,Ǵerard Sajot,P. Salcido,Alberto Sánchez-Hernández,Marijn P A Sanders,B. Sanghi,Amélia Severino Ferreira E Santos,G. Paul Savage,Lee Sawyer,Tim Scanlon,R. Dean Schamberger,Yu A. Scheglov,Heidi M. Schellman,Thorsten Schliephake,S. Schlobohm,Christian Schwanenberger,Reinhard Schwienhorst,Jadranka Sekaric,Horst Severini,Elizaveta K. Shabalina,Viatcheslav V. Shary,Andrey A. Shchukin,Rajiv K. Shivpuri,Vladislav Šimák,Vladimir I. Sirotenko,Patrick L. Skubic,P. F. Slattery,Dmitry V. Smirnov,K. J. Smith,Gregory R. Snow,James M. Snow,Scott S. Snyder,Stefan A. Söldner-Rembold,Lars Sonnenschein,Karel Soustružník,Jan Stark,V. L. Stolin,Dina A. Stoyanova,M. G. Strauss,David M. Strom,Linda Stutte,Larry J. Suter,Peter Svoisky,M. Takahashi,Andrs Jorge Tanasijczuk,Wendy M. Taylor,Maxim Titov,V. V. Tokmenin,Y. T. Tsai,Dmitri Tsybychev,Boris Tuchming,Christopher G. Tully,P. Michael Tuts,L. N. Uvarov,S. Uvarov,S. A. Uzunyan,Richard J. Van Kooten,W. M. Van Leeuwen,Nikos Varelas,Erich W. Varnes,I. A. Vasilyev,Patrice Verdier,L. S. Vertogradov,Marco Verzocchi,Mika Vesterinen,D. Vilanova,P. Vint, P. Vokac,Heinrich D. Wahl,Michael Wang, J. Warchol,Gordon Watts,Mitchell R. Wayne,Marc S. Weber,L. Welty-Rieger,Andrew P. White,Daniel Wicke, Mark R J Williams,Graham W. Wilson,Markus Wobisch, D. R. Wood,T. R. Wyatt,Yangchun Xie,C. Xu,Sahal Yacoob,Ryuji Yamada,Wanching Yang,Takahiro Yasuda,Yu A. Yatsunenko,Zuxin Ye,Hao Yin,Kin Yip,S. W. Youn,Jaehoon Yu,S. Zelitch,Tianchi Zhao,Bing Zhou,Jian Zhu,Marek Zieliński,Daria Ziemińska,Lidia Živković
Physics Letters B（2011）
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摘要
We measure the correlation between the spin of the top quark and the spin of the anti-top quark in tt¯→W+bW−b¯→ℓ+νbℓ−ν¯b¯ final states produced in pp¯ collisions at a center of mass energy 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 t¯ 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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关键词
Top quark,Spin,QCD
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