Access by Xinjiang University

Evidence for a mass dependent forward-backward asymmetry in top quark pair production

T. Aaltonen²¹, B. Álvarez González^9,w, S. Amerio^41a, D. Amidei³², A. Anastassov³⁶, A. Annovi¹⁷, J. Antos¹², G. Apollinari¹⁵, J. A. Appel¹⁵ et al. (CDF Collaboration)

J. A. Appel¹⁵, A. Apresyan⁴⁶, T. Arisawa⁵⁶, A. Artikov¹³, J. Asaadi⁵¹, W. Ashmanskas¹⁵, B. Auerbach⁵⁹, A. Aurisano⁵¹, F. Azfar⁴⁰, W. Badgett¹⁵, A. Barbaro-Galtieri²⁶, V. E. Barnes⁴⁶, B. A. Barnett²³, P. Barria^44c,44a, P. Bartos¹², M. Bauce^41b,41a, G. Bauer³⁰, F. Bedeschi^44a, D. Beecher²⁸, S. Behari²³, G. Bellettini^44b,44a, J. Bellinger⁵⁸, D. Benjamin¹⁴, A. Beretvas¹⁵, A. Bhatti⁴⁸, M. Binkley^15,a, D. Bisello^41b,41a, I. Bizjak^28,aa, K. R. Bland⁵, B. Blumenfeld²³, A. Bocci¹⁴, A. Bodek⁴⁷, D. Bortoletto⁴⁶, J. Boudreau⁴⁵, A. Boveia¹¹, B. Brau^15,b, L. Brigliadori^6b,6a, A. Brisuda¹², C. Bromberg³³, E. Brucken²¹, M. Bucciantonio^44b,44a, J. Budagov¹³, H. S. Budd⁴⁷, S. Budd²², K. Burkett¹⁵, G. Busetto^41b,41a, P. Bussey¹⁹, A. Buzatu³¹, C. Calancha²⁹, S. Camarda⁴, M. Campanelli³³, M. Campbell³², F. Canelli^12,15, A. Canepa⁴³, B. Carls²², D. Carlsmith⁵⁸, R. Carosi^44a, S. Carrillo^16,l, S. Carron¹⁵, B. Casal⁹, M. Casarsa¹⁵, A. Castro^6b,6a, P. Catastini¹⁵, D. Cauz^52a, V. Cavaliere^44c,44a, M. Cavalli-Sforza⁴, A. Cerri^26,g, L. Cerrito^28,r, Y. C. Chen¹, M. Chertok⁷, G. Chiarelli^44a, G. Chlachidze¹⁵, F. Chlebana¹⁵, K. Cho²⁵, D. Chokheli¹³, J. P. Chou²⁰, W. H. Chung⁵⁸, Y. S. Chung⁴⁷, C. I. Ciobanu⁴², M. A. Ciocci^44c,44a, A. Clark¹⁸, G. Compostella^41b,41a, M. E. Convery¹⁵, J. Conway⁷, M. Corbo⁴², M. Cordelli¹⁷, C. A. Cox⁷, D. J. Cox⁷, F. Crescioli^44b,44a, C. Cuenca Almenar⁵⁹, J. Cuevas^9,w, R. Culbertson¹⁵, D. Dagenhart¹⁵, N. d’Ascenzo^42,u, M. Datta¹⁵, P. de Barbaro⁴⁷, S. De Cecco^49a, G. De Lorenzo⁴, M. Dell’Orso^44b,44a, C. Deluca⁴, L. Demortier⁴⁸, J. Deng^14,d, M. Deninno^6a, F. Devoto²¹, M. d’Errico^41b,41a, A. Di Canto^44b,44a, B. Di Ruzza^44a, J. R. Dittmann⁵, M. D’Onofrio²⁷, S. Donati^44b,44a, P. Dong¹⁵, M. Dorigo^52a, T. Dorigo^41a, K. Ebina⁵⁶, A. Elagin⁵¹, A. Eppig³², R. Erbacher⁷, D. Errede²², S. Errede²², N. Ershaidat^42,z, R. Eusebi⁵¹, H. C. Fang²⁶, S. Farrington⁴⁰, M. Feindt²⁴, J. P. Fernandez²⁹, C. Ferrazza^44d,44a, R. Field¹⁶, G. Flanagan^46,s, R. Forrest⁷, M. J. Frank⁵, M. Franklin²⁰, J. C. Freeman¹⁵, Y. Funakoshi⁵⁶, I. Furic¹⁶, M. Gallinaro⁴⁸, J. Galyardt¹⁰, J. E. Garcia¹⁸, A. F. Garfinkel⁴⁶, P. Garosi^44c,44a, H. Gerberich²², E. Gerchtein¹⁵, S. Giagu^49b,49a, V. Giakoumopoulou³, P. Giannetti^44a, K. Gibson⁴⁵, C. M. Ginsburg¹⁵, N. Giokaris³, P. Giromini¹⁷, M. Giunta^44a, G. Giurgiu²³, V. Glagolev¹³, D. Glenzinski¹⁵, M. Gold³⁵, D. Goldin⁵¹, N. Goldschmidt¹⁶, A. Golossanov¹⁵, G. Gomez⁹, G. Gomez-Ceballos³⁰, M. Goncharov³⁰, O. González²⁹, I. Gorelov³⁵, A. T. Goshaw¹⁴, K. Goulianos⁴⁸, A. Gresele^41a, S. Grinstein⁴, C. Grosso-Pilcher¹¹, R. C. Group⁵⁵, J. Guimaraes da Costa²⁰, Z. Gunay-Unalan³³, C. Haber²⁶, S. R. Hahn¹⁵, E. Halkiadakis⁵⁰, A. Hamaguchi³⁹, J. Y. Han⁴⁷, F. Happacher¹⁷, K. Hara⁵³, D. Hare⁵⁰, M. Hare⁵⁴, R. F. Harr⁵⁷, K. Hatakeyama⁵, C. Hays⁴⁰, M. Heck²⁴, J. Heinrich⁴³, M. Herndon⁵⁸, S. Hewamanage⁵, D. Hidas⁵⁰, A. Hocker¹⁵, W. Hopkins^15,h, D. Horn²⁴, S. Hou¹, R. E. Hughes³⁷, M. Hurwitz¹¹, U. Husemann⁵⁹, N. Hussain³¹, M. Hussein³³, J. Huston³³, G. Introzzi^44a, M. Iori^49b,49a, A. Ivanov^7,p, E. James¹⁵, D. Jang¹⁰, B. Jayatilaka¹⁴, E. J. Jeon²⁵, M. K. Jha^6a, S. Jindariani¹⁵, W. Johnson⁷, M. Jones⁴⁶, K. K. Joo²⁵, S. Y. Jun¹⁰, T. R. Junk¹⁵, T. Kamon⁵¹, P. E. Karchin⁵⁷, Y. Kato^39,b, W. Ketchum¹¹, J. Keung⁴³, V. Khotilovich⁵¹, B. Kilminster¹⁵, D. H. Kim²⁵, H. S. Kim²⁵, H. W. Kim²⁵, J. E. Kim²⁵, M. J. Kim¹⁷, S. B. Kim²⁵, S. H. Kim⁵³, Y. K. Kim¹¹, N. Kimura⁵⁶, M. Kirby¹⁵, S. Klimenko¹⁶, K. Kondo⁵⁶, D. J. Kong²⁵, J. Konigsberg¹⁶, A. V. Kotwal¹⁴, M. Kreps²⁴, J. Kroll⁴³, D. Krop¹¹, N. Krumnack^5,m, M. Kruse¹⁴, V. Krutelyov^51,e, T. Kuhr²⁴, M. Kurata⁵³, S. Kwang¹¹, A. T. Laasanen⁴⁶, S. Lami^44a, S. Lammel¹⁵, M. Lancaster²⁸, R. L. Lander⁷, K. Lannon^37,v, A. Lath⁵⁰, G. Latino^44c,44a, I. Lazzizzera^41a, T. LeCompte², E. Lee⁵¹, H. S. Lee¹¹, J. S. Lee²⁵, S. W. Lee^51,x, S. Leo^44b,44a, S. Leone^44a, J. D. Lewis¹⁵, C.-J. Lin²⁶, J. Linacre⁴⁰, M. Lindgren¹⁵, E. Lipeles⁴³, A. Lister¹⁸, D. O. Litvintsev¹⁵, C. Liu⁴⁵, Q. Liu⁴⁶, T. Liu¹⁵, S. Lockwitz⁵⁹, N. S. Lockyer⁴³, A. Loginov⁵⁹, D. Lucchesi^41b,41a, J. Lueck²⁴, P. Lujan²⁶, P. Lukens¹⁵, G. Lungu⁴⁸, J. Lys²⁶, R. Lysak¹², R. Madrak¹⁵, K. Maeshima¹⁵, K. Makhoul³⁰, P. Maksimovic²³, S. Malik⁴⁸, G. Manca^27,c, A. Manousakis-Katsikakis³, F. Margaroli⁴⁶, C. Marino²⁴, M. Martínez⁴, R. Martínez-Ballarín²⁹, P. Mastrandrea^49a, M. Mathis²³, M. E. Mattson⁵⁷, P. Mazzanti^6a, K. S. McFarland⁴⁷, P. McIntyre⁵¹, R. McNulty^27,j, A. Mehta²⁷, P. Mehtala²¹, A. Menzione^44a, C. Mesropian⁴⁸, T. Miao¹⁵, D. Mietlicki³², A. Mitra¹, H. Miyake⁵³, S. Moed²⁰, N. Moggi^6a, M. N. Mondragon^15,l, C. S. Moon²⁵, R. Moore¹⁵, M. J. Morello¹⁵, J. Morlock²⁴, P. Movilla Fernandez¹⁵, A. Mukherjee¹⁵, Th. Muller²⁴, P. Murat¹⁵, M. Mussini^6b,6a, J. Nachtman^15,n, Y. Nagai⁵³, J. Naganoma⁵⁶, I. Nakano³⁸, A. Napier⁵⁴, J. Nett⁵⁸, C. Neu⁵⁵, M. S. Neubauer²², J. Nielsen^26,f, L. Nodulman², O. Norniella²², E. Nurse²⁸, L. Oakes⁴⁰, S. H. Oh¹⁴, Y. D. Oh²⁵, I. Oksuzian⁵⁵, T. Okusawa³⁹, R. Orava²¹, L. Ortolan⁴, S. Pagan Griso^41b,41a, C. Pagliarone^52a, E. Palencia^9,g, V. Papadimitriou¹⁵, A. A. Paramonov², J. Patrick¹⁵, G. Pauletta^52b,52a, M. Paulini¹⁰, C. Paus³⁰, D. E. Pellett⁷, A. Penzo^52a, T. J. Phillips¹⁴, G. Piacentino^44a, E. Pianori⁴³, J. Pilot³⁷, K. Pitts²², C. Plager⁸, L. Pondrom⁵⁸, K. Potamianos⁴⁶, O. Poukhov^13,a, F. Prokoshin^13,y, A. Pronko¹⁵, F. Ptohos^17,i, E. Pueschel¹⁰, G. Punzi^44b,44a, J. Pursley⁵⁸, A. Rahaman⁴⁵, V. Ramakrishnan⁵⁸, N. Ranjan⁴⁶, I. Redondo²⁹, P. Renton⁴⁰, M. Rescigno^49a, F. Rimondi^6b,6a, L. Ristori^45,15, A. Robson¹⁹, T. Rodrigo⁹, T. Rodriguez⁴³, E. Rogers²², S. Rolli⁵⁴, R. Roser¹⁵, M. Rossi^52a, F. Rubbo¹⁵, F. Ruffini^44c,44a, A. Ruiz⁹, J. Russ¹⁰, V. Rusu¹⁵, A. Safonov⁵¹, W. K. Sakumoto⁴⁷, Y. Sakurai⁵⁶, L. Santi^52b,52a, L. Sartori^44a, K. Sato⁵³, V. Saveliev^42,u, A. Savoy-Navarro⁴², P. Schlabach¹⁵, A. Schmidt²⁴, E. E. Schmidt¹⁵, M. P. Schmidt^59,a, M. Schmitt³⁶, T. Schwarz⁷, L. Scodellaro⁹, A. Scribano^44c,44a, F. Scuri^44a, A. Sedov⁴⁶, S. Seidel³⁵, Y. Seiya³⁹, A. Semenov¹³, F. Sforza^44b,44a, A. Sfyrla²², S. Z. Shalhout⁷, T. Shears²⁷, P. F. Shepard⁴⁵, M. Shimojima^53,t, S. Shiraishi¹¹, M. Shochet¹¹, I. Shreyber³⁴, A. Simonenko¹³, P. Sinervo³¹, A. Sissakian^13,a, K. Sliwa⁵⁴, J. R. Smith⁷, F. D. Snider¹⁵, A. Soha¹⁵, S. Somalwar⁵⁰, V. Sorin⁴, P. Squillacioti¹⁵, M. Stancari¹⁵, M. Stanitzki⁵⁹, R. St. Denis¹⁹, B. Stelzer³¹, O. Stelzer-Chilton³¹, D. Stentz³⁶, J. Strologas³⁵, G. L. Strycker³², Y. Sudo⁵³, A. Sukhanov¹⁶, I. Suslov¹³, K. Takemasa⁵³, Y. Takeuchi⁵³, J. Tang¹¹, M. Tecchio³², P. K. Teng¹, J. Thom^15,h, J. Thome¹⁰, G. A. Thompson²², E. Thomson⁴³, P. Ttito-Guzmán²⁹, S. Tkaczyk¹⁵, D. Toback⁵¹, S. Tokar¹², K. Tollefson³³, T. Tomura⁵³, D. Tonelli¹⁵, S. Torre¹⁷, D. Torretta¹⁵, P. Totaro^52b,52a, M. Trovato^44d,44a, Y. Tu⁴³, F. Ukegawa⁵³, S. Uozumi²⁵, A. Varganov³², F. Vázquez^16,l, G. Velev¹⁵, C. Vellidis³, M. Vidal²⁹, I. Vila⁹, R. Vilar⁹, M. Vogel³⁵, G. Volpi^44b,44a, P. Wagner⁴³, R. L. Wagner¹⁵, T. Wakisaka³⁹, R. Wallny⁸, S. M. Wang¹, A. Warburton³¹, D. Waters²⁸, M. Weinberger⁵¹, W. C. Wester, III¹⁵, B. Whitehouse⁵⁴, D. Whiteson^43,d, A. B. Wicklund², E. Wicklund¹⁵, S. Wilbur¹¹, F. Wick²⁴, H. H. Williams⁴³, J. S. Wilson³⁷, P. Wilson¹⁵, B. L. Winer³⁷, P. Wittich^15,h, S. Wolbers¹⁵, H. Wolfe³⁷, T. Wright³², X. Wu¹⁸, Z. Wu⁵, K. Yamamoto³⁹, J. Yamaoka¹⁴, T. Yang^15,o, U. K. Yang^11,q, Y. C. Yang²⁵, W.-M. Yao²⁶, G. P. Yeh¹⁵, K. Yi^15,n, J. Yoh¹⁵, K. Yorita⁵⁶, T. Yoshida^39,k, G. B. Yu¹⁴, I. Yu²⁵, S. S. Yu¹⁵, J. C. Yun¹⁵, A. Zanetti^52a, Y. Zeng¹⁴, and S. Zucchelli^6b,6a (CDF Collaboration)

¹Institute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of China
²Argonne National Laboratory, Argonne, Illinois 60439, USA
³University of Athens, 157 71 Athens, Greece
⁴Institut de Fisica d’Altes Energies, Universitat Autonoma de Barcelona, E-08193, Bellaterra (Barcelona), Spain
⁵Baylor University, Waco, Texas 76798, USA
^6aIstituto Nazionale di Fisica Nucleare Bologna, I-40127 Bologna, Italy
^6bUniversity of Bologna, I-40127 Bologna, Italy
⁷University of California, Davis, Davis, California 95616, USA
⁸University of California, Los Angeles, Los Angeles, California 90024, USA
⁹Instituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005 Santander, Spain
¹⁰Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
¹¹Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
¹²Comenius University, 842 48 Bratislava, Slovakia; Institute of Experimental Physics, 040 01 Kosice, Slovakia
¹³Joint Institute for Nuclear Research, RU-141980 Dubna, Russia
¹⁴Duke University, Durham, North Carolina 27708, USA
¹⁵Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
¹⁶University of Florida, Gainesville, Florida 32611, USA
¹⁷Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy
¹⁸University of Geneva, CH-1211 Geneva 4, Switzerland
¹⁹Glasgow University, Glasgow G12 8QQ, United Kingdom
²⁰Harvard University, Cambridge, Massachusetts 02138, USA
²¹Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland
²²University of Illinois, Urbana, Illinois 61801, USA
²³The Johns Hopkins University, Baltimore, Maryland 21218, USA
²⁴Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany
²⁵Center for High Energy Physics: Kyungpook National University, Daegu 702-701, Korea; Seoul National University, Seoul 151-742, Korea; Sungkyunkwan University, Suwon 440-746, Korea; Korea Institute of Science and Technology Information, Daejeon 305-806, Korea; Chonnam National University, Gwangju 500-757, Korea; Chonbuk National University, Jeonju 561-756, Korea
²⁶Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
²⁷University of Liverpool, Liverpool L69 7ZE, United Kingdom
²⁸University College London, London WC1E 6BT, United Kingdom
²⁹Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, E-28040 Madrid, Spain
³⁰Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
³¹Institute of Particle Physics: McGill University, Montréal, Québec, Canada H3A 2T8; Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6; University of Toronto, Toronto, Ontario, Canada M5S 1A7; and TRIUMF, Vancouver, British Columbia, Canada V6T 2A3
³²University of Michigan, Ann Arbor, Michigan 48109, USA
³³Michigan State University, East Lansing, Michigan 48824, USA
³⁴Institution for Theoretical and Experimental Physics, ITEP, Moscow 117259, Russia
³⁵University of New Mexico, Albuquerque, New Mexico 87131, USA
³⁶Northwestern University, Evanston, Illinois 60208, USA
³⁷The Ohio State University, Columbus, Ohio 43210, USA
³⁸Okayama University, Okayama 700-8530, Japan
³⁹Osaka City University, Osaka 588, Japan
⁴⁰University of Oxford, Oxford OX1 3RH, United Kingdom
^41aIstituto Nazionale di Fisica Nucleare, Sezione di Padova-Trento, I-35131 Padova, Italy
^41bUniversity of Padova, I-35131 Padova, Italy
⁴²LPNHE, Universite Pierre et Marie Curie/IN2P3-CNRS, UMR7585, Paris, F-75252 France
⁴³University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
^44aIstituto Nazionale di Fisica Nucleare Pisa, I-56127 Pisa, Italy
^44bUniversity of Pisa, I-56127 Pisa, Italy
^44cUniversity of Siena, I-56127 Pisa, Italy
^44dScuola Normale Superiore, I-56127 Pisa, Italy
⁴⁵University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
⁴⁶Purdue University, West Lafayette, Indiana 47907, USA
⁴⁷University of Rochester, Rochester, New York 14627, USA
⁴⁸The Rockefeller University, New York, New York 10065, USA
^49aIstituto Nazionale di Fisica Nucleare, Sezione di Roma 1, I-00185 Roma, Italy
^49bSapienza Università di Roma, I-00185 Roma, Italy
⁵⁰Rutgers University, Piscataway, New Jersey 08855, USA
⁵¹Texas A&M University, College Station, Texas 77843, USA
^52aIstituto Nazionale di Fisica Nucleare Trieste/Udine, I-34100 Trieste, I-33100 Udine, Italy
^52bUniversity of Trieste/Udine, I-33100 Udine, Italy
⁵³University of Tsukuba, Tsukuba, Ibaraki 305, Japan
⁵⁴Tufts University, Medford, Massachusetts 02155, USA
⁵⁵University of Virginia, Charlottesville, Virginia 22906, USA
⁵⁶Waseda University, Tokyo 169, Japan
⁵⁷Wayne State University, Detroit, Michigan 48201, USA
⁵⁸University of Wisconsin, Madison, Wisconsin 53706, USA
⁵⁹Yale University, New Haven, Connecticut 06520, USA

^aDeceased.
^bWith visitor from University of MA Amherst, Amherst, MA 01003., USA
^cWith visitor from Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari, 09042 Monserrato (Cagliari), Italy.
^dWith visitor from University of CA Irvine, Irvine, CA 92697., USA
^eWith visitor from University of CA Santa Barbara, Santa Barbara, CA 93106., USA
^fWith visitor from University of CA Santa Cruz, Santa Cruz, CA 95064., USA
^gWith visitor from CERN,CH-1211 Geneva, Switzerland.
^hWith visitor from Cornell University, Ithaca, NY 14853., USA
ⁱWith visitor from University of Cyprus, Nicosia CY-1678, Cyprus.
^jWith visitor from University College Dublin, Dublin 4, Ireland.
^kWith visitor from University of Fukui, Fukui City, Fukui Prefecture, Japan 910-0017.
^lWith visitor from Universidad Iberoamericana, Mexico D.F., Mexico.
^mWith visitor from IA State University, Ames, IA 50011., USA
ⁿWith visitor from University of IA, IA City, IA 52242., USA
^oWith visitor from Kinki University, Higashi-Osaka City, Japan 577-8502.
^pWith visitor from KS State University, Manhattan, KS 66506., USA
^qWith visitor from University of Manchester, Manchester M13 9PL, England.
^rWith visitor from Queen Mary, University of London, London, E1 4NS, England.
^sWith visitor from Muons, Inc., Batavia, IL 60510., USA
^tWith visitor from Nagasaki Institute of Applied Science, Nagasaki, Japan.
^uWith visitor from National Research Nuclear University, Moscow, Russia.
^vWith visitor from University of Notre Dame, Notre Dame, IN 46556., USA
^wWith visitor from Universidad de Oviedo, E-33007 Oviedo, Spain.
^xWith visitor from TX Tech University, Lubbock, TX 79609., USA
^yWith visitor from Universidad Tecnica Federico Santa Maria, 110v Valparaiso, Chile.
^zWith visitor from Yarmouk University, Irbid 211-63, Jordan.
^aaOn leave from J. Stefan Institute, Ljubljana, Slovenia.

PDF

Phys. Rev. D 83, 112003 – Published 8 June, 2011

DOI: https://doi.org/10.1103/PhysRevD.83.112003

Abstract

We present a new measurement of the inclusive forward-backward $t \bar{t}$ production asymmetry and its rapidity and mass dependence. The measurements are performed with data corresponding to an integrated luminosity of $5.3 {fb}^{- 1}$ of $p \bar{p}$ collisions at $\sqrt{s} = 1.96 TeV$ , recorded with the CDF-II Detector at the Fermilab Tevatron. Significant inclusive asymmetries are observed in both the laboratory frame and the $t \bar{t}$ rest frame, and in both cases are found to be consistent with $C P$ conservation under interchange of $t$ and $\bar{t}$ . In the $t \bar{t}$ rest frame, the asymmetry is observed to increase with the $t \bar{t}$ rapidity difference, $Δ y$ , and with the invariant mass $M_{t \bar{t}}$ of the $t \bar{t}$ system. Fully corrected parton-level asymmetries are derived in two regions of each variable, and the asymmetry is found to be most significant at large $Δ y$ and $M_{t \bar{t}}$ . For $M_{t \bar{t}} \geq 450 GeV / c^{2}$ , the parton-level asymmetry in the $t \bar{t}$ rest frame is $A^{t \bar{t}} = 0.475 \pm 0.114$ compared to a next-to-leading order QCD prediction of $0.088 \pm 0.013$ .

Article Text

References (31)

L. G. Almeida, G. F. Sterman, and W. Vogelsang, Phys. Rev. D 78, 014008 (2008).
O. Antunano, J. H. Kuhn, and G. V. Rodrigo, Phys. Rev. D 77, 014003 (2008).
M. T. Bowen, S. D. Ellis, and D. Rainwater, Phys. Rev. D 73, 014008 (2006).
F. A. Berends, K. J. F. Gaemers, and R. Gastmans, Nucl. Phys. B63, 381 (1973); T. Himel et al., Phys. Rev. Lett. 41, 449 (1978).
T. Aaltonen et al. (CDF Collaboration), Phys. Rev. Lett. 101, 202001 (2008).
V. M. Abazov et al. (D0 Collaboration), Phys. Rev. Lett. 100, 142002 (2008).
D. W. Jung, P. Ko, J. S. Lee, and S. H. Nam, Phys. Lett. B 691, 238 (2010); E. Alvarez, L. DaRold, and A. Szynkman, J. High Energy Phys. 11 (2011) 70; D. W. Jung, P. Ko, and J. S. Lee, arXiv:1011.5976; C. H. Chen, G. Cvetic, and C. S. Kim, arXiv:1009.5976; Y. K. Wong, B. Xiao, and S. H. Zhu, Phys. Rev. D 82, 094011 (2010); A. Djouadi, G. Moreau, F. Richard, and R. K. Singh, 82, 071702(R) (2010); M. Bauer, F. Goertz, U. Haisch, T. Pfoh, and S. Westhoff, J. High Energy Phys. 11 (2010) 039; R. S. Chivukula, E. H. Simmons, and C. P. Yuan, Phys. Rev. D 82, 094009 (2010); B. Xiao, Y. K. Wang, and S. H. Zhu, 82, 034026 (2010); Q. H. Cao, D. McKeen, J. L. Rosner, G. Shaughnessy, and C. E. M. Wagner, 81, 114004 (2010); I. Dorsner, S. Fajfer, J. F. Kamenik, and N. Kosnik, 81, 055009 (2010); S. Jung, H. Murayama, A. Pierce, and J. D. Wells, 81, 015004 (2010); K. Cheung, W.-Y. Keung, and T.-C. Yuan, Phys. Lett. B 682, 287 (2009); P. H. Frampton, J. Shu, and K. Wang, 683, 294 (2010); J. Shu, T. M. P. Tait, and K. Wang, Phys. Rev. D 81, 034012 (2010); A. Arhrib, R. Benbrik, and C. H. Chen, 82, 034034 (2010); D. W. Jung, P. Ko, J. S. Lee, and S. H. Nam, Phys. Lett. B 691, 238 (2010); J. Cao, Z. Heng, L. Wu, and J. M. Yang, Phys. Rev. D 81, 014016 (2010); V. Barger, W. Y. Keung, and C. T. Yu, 81, 113009 (2010); P. Ferrario and G. Rodrigo, 78, 094018 (2008).
P. Ferrario and G. Rodrigo, Phys. Rev. D 80, 051701 (2009).
T. Aaltonen et al. (CDF Collaboration), Phys. Rev. Lett. 105, 012001 (2010); D. Acosta et al. (CDF Collaboration), Phys. Rev. D 71, 052003 (2005).
T. Aaltonen et al. (CDF Collaboration), Phys. Rev. Lett. 102, 222003 (2009).
D. Acosta et al. (CDF Collaboration), Phys. Rev. D 71, 032001 (2005); CDF-II Collaboration, Detector Technical Design Report No FERMILAB-PUB/390-E, 1996.
The polar angle is $θ$ and the azimuthal angle is $ϕ$ . With total energy $E$ and momentum $p$ , the transverse energy is defined as $E_{T} = E \sin θ$ and the transverse momentum is $p_{T} = p \sin θ$ . The missing transverse energy ( $E_{T}$ ) is defined by ${\vec{E}}_{T} = - Σ_{i} E_{T}^{i} {\hat{n}}_{i}$ where ${\hat{n}}_{i}$ is a unit vector perpendicular to the beam axis and pointing to the $i$ th calorimeter tower. The pseudorapidity is $η = - \ln (\tan (θ / 2))$ .
Unless otherwise stated, the inclusion of the charge-conjugate mode is implied.
D. Acosta et al. (CDF Collaboration), Phys. Rev. D 71, 052003 (2005).
M. L. Mangano, M. Moretti, F. Piccinini, R. Pittau, and A. Polosa, J. High Energy Phys. 07 (2003) 001.
A. Abulencia et al. (CDF Collaboration), Phys. Rev. D 73, 032003 (2006).
T. Sjostrand, S. Mrenna, and P. Skands, J. High Energy Phys. 05 (2006) 026.
J. Pumplin et al., J. High Energy Phys. 07 (2002) 012.
T. Aaltonen et al. (CDF Collaboration), Phys. Lett. B 691, 183 (2010).
S. Frixione and B. R. Webber, J. High Energy Phys. 06 (2002) 029.
The rapidity resolution is independent of polar angle as a consequence of dividing the calorimeter into towers of constant y-width.
J. M. Campbell and R. K. Ellis, Phys. Rev. D 60, 113006 (1999).
J. Alwall, P. Demin, S. de Visscher, R. Frederix, M. Herquet, F. Maltoni, T. Plehn, D. L. Rainwater, T. Stelzerand , J. High Energy Phys. 09 (2007) 028.
R. W. Brown, D. Sahdev, and K. O. Mikaelian, Phys. Rev. Lett. 43, 1069 (1979); F. Halzen, P. Hoyer, C. S. Kimand , Phys. Lett. B 195, 74 (1987); P. Nason, S. Dawson, and R. K. Ellis, Nucl. Phys. B303, 607 (1988).
G. Sterman (private communication).
S. Dittmaier, P. Uwer, and S. Weinzier, Nucl. Phys. B, Proc. Suppl. 183, 196 (2008).
We are indebted to T. Tait for the madgraph implementation of the color-octet models.
T. Schwarz, Ph.D. thesis, University of Michigan, 2006, Report No. FERMILAB-THESIS-2006-51.
D. Hirschbuehl, Ph.D. thesis, Karlsruhe University, 2005, Report No. FEMILAB-THESIS-2005-80.
G. Strycker, Ph.D. thesis, University of Michigan, 2006, Report No. FERMILAB-THESIS-2010-37.
V. M. Abazov et al. (D0 Collaboration), Phys. Lett. B 668, 98 (2008).

Physical Review D

Export citation

Export citation

Evidence for a mass dependent forward-backward asymmetry in top quark pair production

Abstract

Article Text

References (31)

Outline

Information

Filter

Filter

Article Lookup

Enter a citation