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

Aaltonen, T. et al. (2011) Evidence for a mass dependent forward-backward asymmetry in top quark pair production. Physical Review D, 83 (11). ISSN 1550-7998 (doi:10.1103/PhysRevD.83.112003)

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Abstract

We present a new measurement of the inclusive forward-backward tt‾ 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 pp‾ collisions at ffiffiffi s p ¼ 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 tt ‾ rest frame, and in both cases are found to be consistent withCPconservation under interchange oft and t ‾. In the tt ‾rest frame, the asymmetry is observed to increase with the tt ‾rapidity difference, y, and with the invariant mass Mtt ‾ of the tt ‾ 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 y and Mtt ‾. For Mtt ≥ 450 GeV=c2, the parton-level asymmetry in the tt ‾rest frame isAtt ‾ ¼ 0:475 0:114 compared to a next-to-leading order QCD prediction of 0:088 0:013.

Item Type:Article
Status:Published
Refereed:Yes
Glasgow Author(s):St Denis, Dr Richard and Robson, Dr Aidan and Bussey, Dr Peter
Authors: Aaltonen, T., Álvarez González, B., Amerio, S., Amidei, D., Anastassov, A., Annovi, A., Antos, J., Apollinari, G., Appel, J., Apresyan, A., Arisawa, T., Artikov, A., Asaadi, J., Ashmanskas, W., Auerbach, B., Aurisano, A., Azfar, F., Badgett, W., Barbaro-Galtieri, A., Barnes, V., Barnett, B., Barria, P., Bartos, P., Bauce, M., Bauer, G., Bedeschi, F., Beecher, D., Behari, S., Bellettini, G., Bellinger, J., Benjamin, D., Beretvas, A., Bhatti, A., Binkley, M., Bisello, D., Bizjak, I., Bland, K., Blumenfeld, B., Bocci, A., Bodek, A., Bortoletto, D., Boudreau, J., Boveia, A., Brau, B., Brigliadori, L., Brisuda, A., Bromberg, C., Brucken, E., Bucciantonio, M., Budagov, J., Budd, H., Budd, S., Burkett, K., Busetto, G., Bussey, P., Buzatu, A., Calancha, C., Camarda, S., Campanelli, M., Campbell, M., Canelli, F., Canepa, A., Carls, B., Carlsmith, D., Carosi, R., Carrillo, S., Carron, S., Casal, B., Casarsa, M., Castro, A., Catastini, P., Cauz, D., Cavaliere, V., Cavalli-Sforza, M., Cerri, A., Cerrito, L., Chen, Y., Chertok, M., Chiarelli, G., Chlachidze, G., Chlebana, F., Cho, K., Chokheli, D., Chou, J., Chung, W., Chung, Y., Ciobanu, C., Ciocci, M., Clark, A., Compostella, G., Convery, M., Conway, J., Corbo, M., Cordelli, M., Cox, C., Cox, D., Crescioli, F., Cuenca Almenar, C., Cuevas, J., Culbertson, R., Dagenhart, D., d’Ascenzo, N., Datta, M., de Barbaro, P., De Cecco, S., De Lorenzo, G., Dell’Orso, M., Deluca, C., Demortier, L., Deng, J., Deninno, M., Devoto, F., d’Errico, M., Di Canto, A., Di Ruzza, B., Dittmann, J., D’Onofrio, M., Donati, S., Dong, P., Dorigo, M., Dorigo, T., Ebina, K., Elagin, A., Eppig, A., Erbacher, R., Errede, D., Errede, S., Ershaidat, N., Eusebi, R., Fang, H., Farrington, S., Feindt, M., Fernandez, J., Ferrazza, C., Field, R., Flanagan, G., Forrest, R., Frank, M., Franklin, M., Freeman, J., Funakoshi, Y., Furic, I., Gallinaro, M., Galyardt, J., Garcia, J., Garfinkel, A., Garosi, P., Gerberich, H., Gerchtein, E., Giagu, S., Giakoumopoulou, V., Giannetti, P., Gibson, K., Ginsburg, C., Giokaris, N., Giromini, P., Giunta, M., Giurgiu, G., Glagolev, V., Glenzinski, D., Gold, M., Goldin, D., Goldschmidt, N., Golossanov, A., Gomez, G., Gomez-Ceballos, G., Goncharov, M., González, O., Gorelov, I., Goshaw, A., Goulianos, K., Gresele, A., Grinstein, S., Grosso-Pilcher, C., Group, R., Guimaraes da Costa, J., Gunay-Unalan, Z., Haber, C., Hahn, S., Halkiadakis, E., Hamaguchi, A., Han, J., Happacher, F., Hara, K., Hare, D., Hare, M., Harr, R., Hatakeyama, K., Hays, C., Heck, M., Heinrich, J., Herndon, M., Hewamanage, S., Hidas, D., Hocker, A., Hopkins, W., Horn, D., Hou, S., Hughes, R., Hurwitz, M., Husemann, U., Hussain, N., Hussein, M., Huston, J., Introzzi, G., Iori, M., Ivanov, A., James, E., Jang, D., Jayatilaka, B., Jeon, E., Jha, M., Jindariani, S., Johnson, W., Jones, M., Joo, K., Jun, S., Junk, T., Kamon, T., Karchin, P., Kato, Y., Ketchum, W., Keung, J., Khotilovich, V., Kilminster, B., Kim, D., Kim, H., Kim, H., Kim, J., Kim, M., Kim, S., Kim, S., Kim, Y., Kimura, N., Kirby, M., Klimenko, S., Kondo, K., Kong, D., Konigsberg, J., Kotwal, A., Kreps, M., Kroll, J., Krop, D., Krumnack, N., Kruse, M., Krutelyov, V., Kuhr, T., Kurata, M., Kwang, S., Laasanen, A., Lami, S., Lammel, S., Lancaster, M., Lander, R., Lannon, K., Lath, A., Latino, G., Lazzizzera, I., LeCompte, T., Lee, E., Lee, H., Lee, J., Lee, S., Leo, S., Leone, S., Lewis, J., Lin, C.-J., Linacre, J., Lindgren, M., Lipeles, E., Lister, A., Litvintsev, D., Liu, C., Liu, Q., Liu, T., Lockwitz, S., Lockyer, N., Loginov, A., Lucchesi, D., Lueck, J., Lujan, P., Lukens, P., Lungu, G., Lys, J., Lysak, R., Madrak, R., Maeshima, K., Makhoul, K., Maksimovic, P., Malik, S., Manca, G., Manousakis-Katsikakis, A., Margaroli, F., Marino, C., Martínez, M., Martínez-Ballarín, R., Mastrandrea, P., Mathis, M., Mattson, M., Mazzanti, P., McFarland, K., McIntyre, P., McNulty, R., Mehta, A., Mehtala, P., Menzione, A., Mesropian, C., Miao, T., Mietlicki, D., Mitra, A., Miyake, H., Moed, S., Moggi, N., Mondragon, M., Moon, C., Moore, R., Morello, M., Morlock, J., Movilla Fernandez, P., Mukherjee, A., Muller, Th., Murat, P., Mussini, M., Nachtman, J., Nagai, Y., Naganoma, J., Nakano, I., Napier, A., Nett, J., Neu, C., Neubauer, M., Nielsen, J., Nodulman, L., Norniella, O., Nurse, E., Oakes, L., Oh, S., Oh, Y., Oksuzian, I., Okusawa, T., Orava, R., Ortolan, L., Pagan Griso, S., Pagliarone, C., Palencia, E., Papadimitriou, V., Paramonov, A., Patrick, J., Pauletta, G., Paulini, M., Paus, C., Pellett, D., Penzo, A., Phillips, T., Piacentino, G., Pianori, E., Pilot, J., Pitts, K., Plager, C., Pondrom, L., Potamianos, K., Poukhov, O., Prokoshin, F., Pronko, A., Ptohos, F., Pueschel, E., Punzi, G., Pursley, J., Rahaman, A., Ramakrishnan, V., Ranjan, N., Redondo, I., Renton, P., Rescigno, M., Rimondi, F., Ristori, L., Robson, A., Rodrigo, T., Rodriguez, T., Rogers, E., Rolli, S., Roser, R., Rossi, M., Rubbo, F., Ruffini, F., Ruiz, A., Russ, J., Rusu, V., Safonov, A., Sakumoto, W., Sakurai, Y., Santi, L., Sartori, L., Sato, K., Saveliev, V., Savoy-Navarro, A., Schlabach, P., Schmidt, A., Schmidt, E., Schmidt, M., Schmitt, M., Schwarz, T., Scodellaro, L., Scribano, A., Scuri, F., Sedov, A., Seidel, S., Seiya, Y., Semenov, A., Sforza, F., Sfyrla, A., Shalhout, S., Shears, T., Shepard, P., Shimojima, M., Shiraishi, S., Shochet, M., Shreyber, I., Simonenko, A., Sinervo, P., Sissakian, A., Sliwa, K., Smith, J., Snider, F., Soha, A., Somalwar, S., Sorin, V., Squillacioti, P., Stancari, M., Stanitzki, M., St Denis, R., Stelzer, B., Stelzer-Chilton, O., Stentz, D., Strologas, J., Strycker, G., Sudo, Y., Sukhanov, A., Suslov, I., Takemasa, K., Takeuchi, Y., Tang, J., Tecchio, M., Teng, P., Thom, J., Thome, J., Thompson, G., Thomson, E., Ttito-Guzmán, P., Tkaczyk, S., Toback, D., Tokar, S., Tollefson, K., Tomura, T., Tonelli, D., Torre, S., Torretta, D., Totaro, P., Trovato, M., Tu, Y., Ukegawa, F., Uozumi, S., Varganov, A., Vázquez, F., Velev, G., Vellidis, C., Vidal, M., Vila, I., Vilar, R., Vogel, M., Volpi, G., Wagner, P., Wagner, R., Wakisaka, T., Wallny, R., Wang, S., Warburton, A., Waters, D., Weinberger, M., Wester, W., Whitehouse, B., Whiteson, D., Wicklund, A., Wicklund, E., Wilbur, S., Wick, F., Williams, H., Wilson, J., Wilson, P., Winer, B., Wittich, P., Wolbers, S., Wolfe, H., Wright, T., Wu, X., Wu, Z., Yamamoto, K., Yamaoka, J., Yang, T., Yang, U., Yang, Y., Yao, W.-M., Yeh, G., Yi, K., Yoh, J., Yorita, K., Yoshida, T., Yu, G., Yu, I., Yu, S., Yun, J., Zanetti, A., Zeng, Y., and Zucchelli, S.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review D
Publisher:American Physical Society
ISSN:1550-7998
ISSN (Online):1089-4918
Published Online:8 June 2011

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
395963Experimental Particle PhysicsAnthony DoyleScience & Technologies Facilities Council (STFC)ST/H001077/1Physics and Astronomy