We present new measurements of the inclusive forward-backward tt¯ production asymmetry, AFB, and its dependence on several properties of the tt¯ system. The measurements are performed with the full Tevatron data set recorded with the CDF II detector during pp¯ collisions at s√=1.96  TeV, corresponding to an integrated luminosity of 9.4  fb−1. We measure the asymmetry using the rapidity difference Δy=yt−yt¯. Parton-level results are derived, yielding an inclusive asymmetry of 0.164±0.047(stat+syst). We establish an approximately linear dependence of AFB on the top-quark pair mass Mtt¯ and the rapidity difference |Δy| at detector and parton levels. Assuming the standard model, the probabilities to observe the measured values or larger for the detector-level dependencies are 7.4×10−3 and 2.2×10−3 for Mtt¯ and |Δy| respectively. Lastly, we study the dependence of the asymmetry on the transverse momentum of the tt¯ system at the detector level. These results are consistent with previous lower-precision measurements and provide additional quantification of the functional dependencies of the asymmetry.

Measurement of the top quark forward-backward production asymmetry and its dependence on event kinematic properties

BRIGLIADORI, LUCA;CASTRO, ANDREA;DENINNO, MARIA MADDALENA;MAZZANTI, PAOLO;MOGGI, NICCOLO';MUSSINI, MANUEL;RIMONDI, FRANCO;ZUCCHELLI, STEFANO
2013

Abstract

We present new measurements of the inclusive forward-backward tt¯ production asymmetry, AFB, and its dependence on several properties of the tt¯ system. The measurements are performed with the full Tevatron data set recorded with the CDF II detector during pp¯ collisions at s√=1.96  TeV, corresponding to an integrated luminosity of 9.4  fb−1. We measure the asymmetry using the rapidity difference Δy=yt−yt¯. Parton-level results are derived, yielding an inclusive asymmetry of 0.164±0.047(stat+syst). We establish an approximately linear dependence of AFB on the top-quark pair mass Mtt¯ and the rapidity difference |Δy| at detector and parton levels. Assuming the standard model, the probabilities to observe the measured values or larger for the detector-level dependencies are 7.4×10−3 and 2.2×10−3 for Mtt¯ and |Δy| respectively. Lastly, we study the dependence of the asymmetry on the transverse momentum of the tt¯ system at the detector level. These results are consistent with previous lower-precision measurements and provide additional quantification of the functional dependencies of the asymmetry.
T. Aaltonen;S. Amerio;D. Amidei;A. Anastassov;A. Annovi;J. Antos;G. Apollinari;J. A. Appel;T. Arisawa;A. Artikov;J. Asaadi;W. Ashmanskas;B. Auerbach;A. Aurisano;F. Azfar;W. Badgett;T. Bae;A. Barbaro-Galtieri;V. E. Barnes;B. A. Barnett;P. Barria;P. Bartos;M. Bauce;F. Bedeschi;S. Behari;G. Bellettini;J. Bellinger;D. Benjamin;A. Beretvas;A. Bhatti;K. R. Bland;B. Blumenfeld;A. Bocci;A. Bodek;D. Bortoletto;J. Boudreau;A. Boveia;L. Brigliadori;C. Bromberg;E. Brucken;J. Budagov;H. S. Budd;K. Burkett;G. Busetto;P. Bussey;P. Butti;A. Buzatu;A. Calamba;S. Camarda;M. Campanelli;F. Canelli;B. Carls;D. Carlsmith;R. Carosi;S. Carrillo;B. Casal;M. Casarsa;A. Castro;P. Catastini;D. Cauz;V. Cavaliere;M. Cavalli-Sforza;A. Cerri;L. Cerrito;Y. C. Chen;M. Chertok;G. Chiarelli;G. Chlachidze;K. Cho;D. Chokheli;M. A. Ciocci;A. Clark;C. Clarke;M. E. Convery;J. Conway;M. Corbo;M. Cordelli;C. A. Cox;D. J. Cox;M. Cremonesi;D. Cruz;J. Cuevas;R. Culbertson;N. d’Ascenzo;M. Datta;P. De Barbaro;L. Demortier;M. Deninno;F. Devoto;M. d’Errico;A. Di Canto;B. Di Ruzza;J. R. Dittmann;M. D’Onofrio;S. Donati;M. Dorigo;A. Driutti;K. Ebina;R. Edgar;A. Elagin;R. Erbacher;S. Errede;B. Esham;R. Eusebi;S. Farrington;J. P. Fernández Ramos;R. Field;G. Flanagan;R. Forrest;M. Franklin;J. C. Freeman;H. Frisch;Y. Funakoshi;A. F. Garfinkel;P. Garosi;H. Gerberich;E. Gerchtein;S. Giagu;V. Giakoumopoulou;K. Gibson;C. M. Ginsburg;N. Giokaris;P. Giromini;G. Giurgiu;V. Glagolev;D. Glenzinski;M. Gold;D. Goldin;A. Golossanov;G. Gomez;G. Gomez-Ceballos;M. Goncharov;O. González López;I. Gorelov;A. T. Goshaw;K. Goulianos;E. Gramellini;S. Grinstein;C. Grosso-Pilcher;R. C. Group;J. Guimaraes da Costa;S. R. Hahn;J. Y. Han;F. Happacher;K. Hara;M. Hare;R. F. Harr;T. Harrington-Taber;K. Hatakeyama;C. Hays;J. Heinrich;M. Herndon;A. Hocker;Z. Hong;W. Hopkins;S. Hou;R. E. Hughes;U. Husemann;M. Hussein;J. Huston;G. Introzzi;M. Iori;A. Ivanov;E. James;D. Jang;B. Jayatilaka;E. J. Jeon;S. Jindariani;M. Jones;K. K. Joo;S. Y. Jun;T. R. Junk;M. Kambeitz;T. Kamon;P. E. Karchin;A. Kasmi;Y. Kato;W. Ketchum;J. Keung;B. Kilminster;D. H. Kim;H. S. Kim;J. E. Kim;M. J. Kim;S. B. Kim;S. H. Kim;Y. K. Kim;Y. J. Kim;N. Kimura;M. Kirby;K. Knoepfel;K. Kondo;D. J. Kong;J. Konigsberg;A. V. Kotwal;M. Kreps;J. Kroll;M. Kruse;T. Kuhr;M. Kurata;A. T. Laasanen;S. Lammel;M. Lancaster;K. Lannon;G. Latino;H. S. Lee;J. S. Lee;S. Leo;S. Leone;J. D. Lewis;A. Limosani;E. Lipeles;H. Liu;Q. Liu;T. Liu;S. Lockwitz;A. Loginov;D. Lucchesi;J. Lueck;P. Lujan;P. Lukens;G. Lungu;J. Lys;R. Lysak;R. Madrak;P. Maestro;S. Malik;G. Manca;A. Manousakis-Katsikakis;F. Margaroli;P. Marino;M. Martínez;K. Matera;M. E. Mattson;A. Mazzacane;P. Mazzanti;R. McNulty;A. Mehta;P. Mehtala;C. Mesropian;T. Miao;D. Mietlicki;A. Mitra;H. Miyake;S. Moed;N. Moggi;C. S. Moon;R. Moore;M. J. Morello;A. Mukherjee;Th. Muller;P. Murat;M. Mussini;J. Nachtman;Y. Nagai;J. Naganoma;I. Nakano;A. Napier;J. Nett;C. Neu;T. Nigmanov;L. Nodulman;S. Y. Noh;O. Norniella;L. Oakes;S. H. Oh;Y. D. Oh;I. Oksuzian;T. Okusawa;R. Orava;L. Ortolan;C. Pagliarone;E. Palencia;P. Palni;V. Papadimitriou;W. Parker;G. Pauletta;M. Paulini;C. Paus;T. J. Phillips;G. Piacentino;E. Pianori;J. Pilot;K. Pitts;C. Plager;L. Pondrom;S. Poprocki;K. Potamianos;F. Prokoshin;A. Pranko;F. Ptohos;G. Punzi;N. Ranjan;I. Redondo Fernández;P. Renton;M. Rescigno;T. Riddick;F. Rimondi;L. Ristori;A. Robson;T. Rodriguez;S. Rolli;M. Ronzani;R. Roser;J. L. Rosner;F. Ruffini;A. Ruiz;J. Russ;V. Rusu;A. Safonov;W. K. Sakumoto;Y. Sakurai;L. Santi;K. Sato;V. Saveliev;A. Savoy-Navarro;P. Schlabach;E. E. Schmidt;T. Schwarz;L. Scodellaro;F. Scuri;S. Seidel;Y. Seiya;A. Semenov;F. Sforza;S. Z. Shalhout;T. Shears;P. F. Shepard;M. Shimojima;M. Shochet;I. Shreyber-Tecker;A. Simonenko;P. Sinervo;K. Sliwa;J. R. Smith;F. D. Snider;V. Sorin;H. Song;M. Stancari;R. St. Denis;B. Stelzer;O. Stelzer-Chilton;D. Stentz;J. Strologas;Y. Sudo;A. Sukhanov;I. Suslov;K. Takemasa;Y. Takeuchi;J. Tang;M. Tecchio;P. K. Teng;J. Thom;E. Thomson;V. Thukral;D. Toback;S. Tokar;K. Tollefson;T. Tomura;D. Tonelli;S. Torre;D. Torretta;P. Totaro;M. Trovato;F. Ukegawa;S. Uozumi;F. Vázquez;G. Velev;C. Vellidis;C. Vernieri;M. Vidal;R. Vilar;J. Vizán;M. Vogel;G. Volpi;P. Wagner;R. Wallny;S. M. Wang;A. Warburton;D. Waters;W. C. Wester;D. Whiteson;A. B. Wicklund;S. Wilbur;H. H. Williams;J. S. Wilson;P. Wilson;B. L. Winer;P. Wittich;S. Wolbers;H. Wolfe;T. Wright;X. Wu;Z. Wu;K. Yamamoto;D. Yamato;T. Yang;U. K. Yang;Y. C. Yang;W. -M. Yao;G. P. Yeh;K. Yi;J. Yoh;K. Yorita;T. Yoshida;G. B. Yu;I. Yu;A. M. Zanetti;Y. Zeng;C. Zhou;S. Zucchelli
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/229717
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