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. 2012 May 25;108(21):211805.
doi: 10.1103/PhysRevLett.108.211805. Epub 2012 May 23.

Search for a heavy particle decaying to a top quark and a light quark in pp ¯ collisions at √s=1.96 TeV

T Aaltonen  1 , J Adelman, B Alvarez González, 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, D Bisello, I Bizjak, 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, A Buzatu, A Calamba, C Calancha, S Camarda, M Campanelli, M Campbell, F Canelli, B Carls, D Carlsmith, R Carosi, S Carrillo, S Carron, 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, F Chlebana, K Cho, D Chokheli, W H Chung, Y S Chung, M A Ciocci, A Clark, C Clarke, G Compostella, M E Convery, J Conway, M Corbo, M Cordelli, C A Cox, D J Cox, F Crescioli, J Cuevas, R Culbertson, D Dagenhart, N d'Ascenzo, M Datta, P de Barbaro, M Dell'Orso, L Demortier, M Deninno, F Devoto, M d'Errico, A Di Canto, B Di Ruzza, J R Dittmann, M D'Onofrio, S Donati, P Dong, M Dorigo, T Dorigo, K Ebina, A Elagin, A Eppig, R Erbacher, S Errede, N Ershaidat, R Eusebi, S Farrington, M Feindt, J P Fernandez, R Field, G Flanagan, R Forrest, M J Frank, M Franklin, J C Freeman, Y Funakoshi, I Furic, M Gallinaro, J E Garcia, A F Garfinkel, P Garosi, H Gerberich, E Gerchtein, S Giagu, V Giakoumopoulou, P Giannetti, K Gibson, C M Ginsburg, N Giokaris, P Giromini, G Giurgiu, V Glagolev, D Glenzinski, M Gold, D Goldin, N Goldschmidt, A Golossanov, G Gomez, G Gomez-Ceballos, M Goncharov, O González, I Gorelov, A T Goshaw, K Goulianos, S Grinstein, C Grosso-Pilcher, R C Group, J Guimaraes da Costa, S R Hahn, E Halkiadakis, A Hamaguchi, J Y Han, F Happacher, K Hara, D Hare, M Hare, R F Harr, K Hatakeyama, C Hays, M Heck, J Heinrich, M Herndon, S Hewamanage, A Hocker, W Hopkins, D Horn, S Hou, R E Hughes, M Hurwitz, U Husemann, N Hussain, 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, T Kamon, P E Karchin, A Kasmi, Y Kato, W Ketchum, J Keung, V Khotilovich, 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, S Klimenko, K Knoepfel, K Kondo, D J Kong, J Konigsberg, A V Kotwal, M Kreps, J Kroll, D Krop, M Kruse, V Krutelyov, T Kuhr, M Kurata, S Kwang, A T Laasanen, S Lami, S Lammel, M Lancaster, R L Lander, K Lannon, A Lath, G Latino, T Lecompte, E Lee, H S Lee, J S Lee, S W Lee, S Leo, S Leone, J D Lewis, A Limosani, C-J Lin, M Lindgren, E Lipeles, A Lister, D O Litvintsev, C Liu, 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, K Maeshima, P Maestro, S Malik, G Manca, A Manousakis-Katsikakis, F Margaroli, C Marino, M Martínez, P Mastrandrea, K Matera, M E Mattson, A Mazzacane, P Mazzanti, K S McFarland, P McIntyre, R McNulty, A Mehta, P Mehtala, C Mesropian, T Miao, D Mietlicki, A Mitra, H Miyake, S Moed, N Moggi, M N Mondragon, C S Moon, R Moore, M J Morello, J Morlock, P Movilla Fernandez, A Mukherjee, Th Muller, P Murat, M Mussini, J Nachtman, Y Nagai, J Naganoma, I Nakano, A Napier, J Nett, C Neu, M S Neubauer, J Nielsen, L Nodulman, S Y Noh, O Norniella, L Oakes, S H Oh, Y D Oh, I Oksuzian, T Okusawa, R Orava, L Ortolan, S Pagan Griso, C Pagliarone, E Palencia, V Papadimitriou, A A Paramonov, J Patrick, G Pauletta, M Paulini, C Paus, D E Pellett, A Penzo, 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, A Rahaman, V Ramakrishnan, N Ranjan, K Rao, I Redondo, P Renton, M Rescigno, T Riddick, F Rimondi, L Ristori, A Robson, T Rodrigo, T Rodriguez, E Rogers, S Rolli, R Roser, 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, A Schmidt, E E Schmidt, T Schwarz, L Scodellaro, A Scribano, 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, A Soha, V Sorin, H Song, P Squillacioti, M Stancari, R St Denis, B Stelzer, O Stelzer-Chilton, D Stentz, J Strologas, G L Strycker, Y Sudo, A Sukhanov, I Suslov, K Takemasa, Y Takeuchi, J Tang, M Tecchio, P K Teng, J Thom, J Thome, G A Thompson, E Thomson, D Toback, S Tokar, K Tollefson, T Tomura, D Tonelli, S Torre, D Torretta, P Totaro, M Trovato, F Ukegawa, S Uozumi, A Varganov, F Vázquez, G Velev, C Vellidis, M Vidal, I Vila, R Vilar, J Vizán, M Vogel, G Volpi, P Wagner, R L Wagner, T Wakisaka, R Wallny, S M Wang, A Warburton, D Waters, W C Wester 3rd, D Whiteson, A B Wicklund, E Wicklund, S Wilbur, F Wick, 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, S S Yu, J C Yun, A Zanetti, Y Zeng, C Zhou, S Zucchelli; CDF Collaboration
Affiliations

Search for a heavy particle decaying to a top quark and a light quark in pp ¯ collisions at √s=1.96 TeV

T Aaltonen et al. Phys Rev Lett. .

Abstract

We present a search for a new heavy particle X produced in association with a top quark, pp[over ¯]→t(X→t[over ¯]q) or pp[over ¯]→t[over ¯](X[over ¯]→tq[over ¯]), where q stands for up quarks and down quarks. Such a particle may explain the recent anomalous measurements of top-quark forward-backward asymmetry. If the light-flavor quark (q) is reconstructed as a jet (j), this gives a t[over ¯]+j or t+j resonance in tt[over ¯]+jet events, a previously unexplored experimental signature. In a sample of events with exactly one lepton, missing transverse momentum and at least five jets, corresponding to an integrated luminosity of 8.7 fb(-1) collected by the CDF II detector, we find the data to be consistent with the standard model. We set cross-section upper limits on the production (pp[over ¯]→Xt or X[over ¯]t[over ¯]) at 95% confidence level from 0.61 pb to 0.02 pb for X masses ranging from 200 GeV/c(2) to 800 GeV/c(2), respectively.

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