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Direct measurement of the mass difference between top and antitop quarks

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 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 J.F. Bartlett U. Bassler 2 V. Bazterra S. Beale A. Bean M. Begalli M. Begel 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 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 M. Demarteau 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 3 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 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 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 2 N. Huske 3 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 D. Johnston 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 M.H. Kirby 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 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 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 J. Parsons R. Partridge N. Parua A. Patwa B. Penning M. Perfilov K. Peters 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 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 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 W. Taylor M. Titov 2 V.V. Tokmenin Y.-T. Tsai 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 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
Abstract : We present a direct measurement of the mass difference between top and antitop quarks (dm) in lepton+jets top-antitop final states using the "matrix element" method. The purity of the lepton+jets sample is enhanced for top-antitop events by identifying at least one of the jet as originating from a b quark. The analyzed data correspond to 3.6 fb-1 of proton-antiproton collisions at 1.96 TeV acquired by D0 in Run II of the Fermilab Tevatron Collider. The combination of the e+jets and mu+jets channels yields dm = 0.8 +/- 1.8 (stat) +/- 0.5 (syst) GeV, which is in agreement with the standard model expectation of no mass difference.
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Submitted on : Wednesday, June 15, 2011 - 8:24:53 AM
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V.M. Abazov, B. Abbott, B.S. Acharya, M. Adams, T. Adams, et al.. Direct measurement of the mass difference between top and antitop quarks. Physical Review D, American Physical Society, 2011, 84, pp.052005. ⟨10.1103/PhysRevD.84.052005⟩. ⟨in2p3-00600471⟩

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