학술논문

Measurement of the forward-backward asymmetry of top-quark and antiquark pairs using the full CDF Run II data set
Document Type
Working Paper
Author
CDF CollaborationAaltonen, T.Amerio, S.Amidei, D.Anastassov, A.Annovi, A.Antos, J.Apollinari, G.Appel, J. A.Arisawa, T.Artikov, A.Asaadi, J.Ashmanskas, W.Auerbach, B.Aurisano, A.Azfar, F.Badgett, W.Bae, T.Barbaro-Galtieri, A.Barnes, V. E.Barnett, B. A.Barria, P.Bartos, P.Bauce, M.Bedeschi, F.Behari, S.Bellettini, G.Bellinger, J.Benjamin, D.Beretvas, A.Bhatti, A.Bland, K. R.Blumenfeld, B.Bocci, A.Bodek, A.Bortoletto, D.Boudreau, J.Boveia, A.Brigliadori, L.Bromberg, C.Brucken, E.Budagov, J.Budd, H. S.Burkett, K.Busetto, G.Bussey, P.Butti, P.Buzatu, A.Calamba, A.Camarda, S.Campanelli, M.Canelli, F.Carls, B.Carlsmith, D.Carosi, R.Carrillo, S.Casal, B.Casarsa, M.Castro, A.Catastini, P.Cauz, D.Cavaliere, V.Cerri, A.Cerrito, L.Chen, Y. C.Chertok, M.Chiarelli, G.Chlachidze, G.Cho, K.Chokheli, D.Clark, A.Clarke, C.Convery, M. E.Conway, J.Corbo, M.Cordelli, M.Cox, C. A.Cox, D. J.Cremonesi, M.Cruz, D.Cuevas, J.Culbertson, R.d'Ascenzo, N.Datta, M.de Barbaro, P.Demortier, L.Marchese, L.Deninno, M.Devoto, F.D'Errico, M.Di Canto, A.Di Ruzza, B.Dittmann, J. R.D'Onofrio, M.Donati, S.Dorigo, M.Driutti, A.Ebina, K.Edgar, R.Erbacher, R.Errede, S.Esham, B.Farrington, S.Ramos, J. P. FernándezField, R.Flanagan, G.Forrest, R.Franklin, M.Freeman, J. C.Frisch, H.Funakoshi, Y.Galloni, C.Garfinkel, A. F.Garosi, P.Gerberich, H.Gerchtein, E.Giagu, S.Giakoumopoulou, V.Gibson, K.Ginsburg, C. M.Giokaris, N.Giromini, P.Glagolev, V.Glenzinski, D.Gold, M.Goldin, D.Golossanov, A.Gomez, G.Gomez-Ceballos, G.Goncharov, M.López, O. GonzálezGorelov, I.Goshaw, A. T.Goulianos, K.Gramellini, E.Grosso-Pilcher, C.da Costa, J. GuimaraesHahn, S. R.Han, J. Y.Happacher, F.Hara, K.Hare, M.Harr, R. F.Harrington-Taber, T.Hatakeyama, K.Hays, C.Heinrich, J.Herndon, M.Hocker, A.Hong, Z.Hopkins, W.Hou, S.Hughes, R. E.Husemann, U.Hussein, M.Huston, J.Introzzi, G.Iori, M.Ivanov, A.James, E.Jang, D.Jayatilaka, B.Jeon, E. J.Jindariani, S.Jones, M.Joo, K. K.Jun, S. Y.Junk, T. R.Kambeitz, M.Kamon, T.Karchin, P. E.Kasmi, A.Kato, Y.Ketchum, W.Keung, J.Kilminster, B.Kim, D. H.Kim, H. S.Kim, J. E.Kim, M. J.Kim, S. B.Kim, S. H.Kim, Y. K.Kim, Y. J.Kimura, N.Kirby, M.Kondo, K.Kong, D. J.Konigsberg, J.Kotwal, A. V.Kreps, M.Kroll, J.Kruse, M.Kuhr, T.Kurata, M.Laasanen, A. T.Lammel, S.Lancaster, M.Lannon, K.Latino, G.Lee, H. S.Lee, J. S.Leo, S.Leone, S.Lewis, J. D.Limosani, A.Lipeles, E.Lister, A.Liu, Q.Liu, T.Lockwitz, S.Loginov, A.Lucà, A.Lucchesi, D.Lueck, J.Lujan, P.Lukens, P.Lungu, G.Lys, J.Lysak, R.Madrak, R.Maestro, P.Malik, S.Manca, G.Manousakis-Katsikakis, A.Margaroli, F.Marino, P.Matera, K.Mattson, M. E.Mazzacane, A.Mazzanti, P.McNulty, R.Mehta, A.Mehtala, P.Mesropian, C.Miao, T.Mietlicki, D.Mitra, A.Miyake, H.Moed, S.Moggi, N.Moon, C. S.Moore, R.Morello, M. J.Mukherjee, A.Muller, Th.Murat, P.Mussini, M.Nachtman, J.Nagai, Y.Naganoma, J.Nakano, I.Napier, A.Nett, J.Nigmanov, T.Nodulman, L.Noh, S. Y.Norniella, O.Oakes, L.Oh, S. H.Oh, Y. D.Okusawa, T.Orava, R.Ortolan, L.Pagliarone, C.Palencia, E.Palni, P.Papadimitriou, V.Parker, W.Pauletta, G.Paulini, M.Paus, C.Phillips, T. J.Piacentino, G.Pianori, E.Pilot, J.Pitts, K.Plager, C.Pondrom, L.Poprocki, S.Potamianos, K.Prokoshin, F.Pranko, A.Ptohos, F.Punzi, G.Fernández, I. RedondoRenton, P.Rescigno, M.Rimondi, F.Ristori, L.Robson, A.Rodriguez, T.Rolli, S.Ronzani, M.Roser, R.Rosner, J. L.Ruffini, F.Ruiz, A.Russ, J.Rusu, V.Sakumoto, W. K.Sakurai, Y.Santi, L.Sato, K.Saveliev, V.Savoy-Navarro, A.Schlabach, P.Schmidt, E. E.Schwarz, T.Scodellaro, L.Scuri, F.Seidel, S.Seiya, Y.Semenov, A.Sforza, F.Shalhout, S. Z.Shears, T.Shepard, P. F.Shimojima, M.Shochet, M.Shreyber-Tecker, I.Simonenko, A.Sliwa, K.Smith, J. R.Snider, F. D.Sorin, V.Song, H.Stancari, M.Denis, R. St.Stentz, D.Strologas, J.Sudo, Y.Sukhanov, A.Suslov, I.Takemasa, K.Takeuchi, Y.Tang, J.Tecchio, M.Teng, P. K.Thom, J.Thomson, E.Thukral, V.Toback, D.Tokar, S.Tollefson, K.Tomura, T.Tonelli, D.Torre, S.Torretta, D.Totaro, P.Trovato, M.Ukegawa, F.Uozumi, S.Vázquez, F.Velev, G.Vellidis, C.Vernieri, C.Vidal, M.Vilar, R.Vizán, J.Vogel, M.Volpi, G.Wagner, P.Wallny, R.Wang, S. M.Waters, D.Wester III, W. C.Whiteson, D.Wicklund, A. B.Wilbur, S.Williams, H. H.Wilson, J. S.Wilson, P.Winer, B. L.Wittich, P.Wolbers, S.Wolfe, H.Wright, T.Wu, X.Wu, Z.Yamamoto, K.Yamato, D.Yang, T.Yang, U. K.Yang, Y. C.Yao, W. -M.Yeh, G. P.Yi, K.Yoh, J.Yorita, K.Yoshida, T.Yu, G. B.Yu, I.Zanetti, A. M.Zeng, Y.Zhou, C.Zucchelli, S.
Source
Phys. Rev. D 93, 112005 (2016)
Subject
High Energy Physics - Experiment
Language
Abstract
We measure the forward--backward asymmetry of the production of top quark and antiquark pairs in proton-antiproton collisions at center-of-mass energy $\sqrt{s} = 1.96~\mathrm{TeV}$ using the full data set collected by the Collider Detector at Fermilab (CDF) in Tevatron Run II corresponding to an integrated luminosity of $9.1~\rm{fb}^{-1}$. The asymmetry is characterized by the rapidity difference between top quarks and antiquarks ($\Delta y$), and measured in the final state with two charged leptons (electrons and muons). The inclusive asymmetry, corrected to the entire phase space at parton level, is measured to be $A_{\text{FB}}^{t\bar{t}} = 0.12 \pm 0.13$, consistent with the expectations from the standard-model (SM) and previous CDF results in the final state with a single charged lepton. The combination of the CDF measurements of the inclusive $A_{\text{FB}}^{t\bar{t}}$ in both final states yields $A_{\text{FB}}^{t\bar{t}}=0.160\pm0.045$, which is consistent with the SM predictions. We also measure the differential asymmetry as a function of $\Delta y$. A linear fit to $A_{\text{FB}}^{t\bar{t}}(|\Delta y|)$, assuming zero asymmetry at $\Delta y=0$, yields a slope of $\alpha=0.14\pm0.15$, consistent with the SM prediction and the previous CDF determination in the final state with a single charged lepton. The combined slope of $A_{\text{FB}}^{t\bar{t}}(|\Delta y|)$ in the two final states is $\alpha=0.227\pm0.057$, which is $2.0\sigma$ larger than the SM prediction.
Comment: To be submitted to Phys. Rev. D