First measurement of the forward-backward asymmetry in bottom-quark pair production at high mass

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 Barbarogaltieri,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,Manuela Campanelli,F Canelli,B Carls, D Carlsmith,R Carosi,S Carrillo,B Casal,M Casarsa,A Castro, P Catastini, D Cauz,V Cavaliere,A Cerri, L Cerrito,Y C Chen, M Chertok,G Chiarelli,G Chlachidze,K Cho,D Chokheli,A R 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,M D Errico,F Devoto,A Di Canto,B Di Ruzza,J R Dittmann,S Donati,M D Onofrio,M Dorigo, A Driutti,K Ebina, Ryan Christopher Edgar,A Elagin,R Erbacher, S Errede, B Esham,S Farrington,J P Fernandez Ramos,R C Field, G Flanagan,R Forrest,M Franklin,J Freeman, H Frisch,Y Funakoshi, Camilla Galloni, A F Garfinkel,P Garosi,H Gerberich,E Gerchtein,S Giagu, V Giakoumopoulou, K J Gibson, C M Ginsburg, N Giokaris,P Giromini,V Glagolev,D Glenzinski,M Gold, D Goldin,A Golossanov,Gervasio Gomez,O Gonzalez Lopez,I Gorelov, A T Goshaw, K Goulianos, E Gramellini,C Grossopilcher,J Guimaraes Da Costa, S R Hahn,J Y Han,F Happacher,Kazuhiko Hara,M Hare, R F Harr,T Harringtontaber, K Hatakeyama,C Hays,J Heinrich,Sarah Henry,M Herndon,A Hocker,Zhi Hong, W Hopkins,S Hou, R E Hughes,U Husemann,M Hussein,J Huston,G Introzzi,M Iori,Andrew Ivanov, E James,D Jang,B Jayatilaka,E J Jeon, S Jindariani,Marcus B Jones,K K Joo, S Y Jun, T R Junk,M Kambeitz,T Kamon, P E Karchin,A Kasmi,Yukio Kato,W Ketchum,J Keung,B Kilminster,D H Kim,H S Kim,J E Kim,Min Jung Kim,Sang Bae Kim,Yun Kyung Kim, N Kimura,M H Kirby, K J 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,Hyun Seung Lee,Jae Seung Lee,S Leo, S Leone,J D Lewis, A Limosani, E Lipeles,A Lister,Huan Liu,Qian Liu,Tzuming Liu,S Lockwitz, A Loginov,D Lucchesi,A Luca,J Lueck, P Lujan,P Lukens, G Lungu,J Lys,R Lysak,R Madrak,P Maestro, S Malik,G Manca, A Manousakiskatsikakis, L Marchese,F Margaroli,P Marino,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,Yoshiyuki 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,T J Phillips,G Piacentino,E Pianori,J Pilot,K Pitts,C Plager,L Pondrom,S Poprocki,K Potamianos,A Pranko,F Prokoshin,F Ptohos, G Punzi,I Redondo Fernandez,P Renton, M Rescigno,F Rimondi, L Ristori,A Robson,T Rodriguez, S Rolli,M Ronzani,R Roser,Jonathan L Rosner,F Ruffini, Angel Recio Ruiz,J Russ,V Rusu,W K Sakumoto,Y Sakurai,L Santi,Kengo Sato,V Saveliev, A Savoynavarro,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 Shreybertecker,A Simonenko,K Sliwa,J R Smith,F D Snider,Hongyeop Song,V Sorin,R St Denis,M Stancari,D Stentz,J Strologas,Y Sudo,A Sukhanov,I Suslov,K Takemasa,Y Takeuchi,Jinhui 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 Vazquez,G Velev,C Vellidis,Caterina Vernieri,M Vidal,R Vilar, J Vizan,M Vogel,G Volpi,P Wagner,R Wallny, S M Wang, 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,Timothy M Wright,Xuan Wu,Zhigang 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 Zanetti, Y Zeng,C Zhou,S Zucchelli,G Gomezceballos,M Goncharov, C Paus

PHYSICAL REVIEW D（2015）

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摘要

We measure the particle-level forward-backward production asymmetry in b (b) over bar pairs with masses (m(b (b) over bar)) larger than 150 GeV/c(2), using events with hadronic jets and employing jet charge to distinguish b from (b) over bar. The measurement uses 9.5 fb(-1) of p (p) over bar collisions at a center-of-mass energy of 1.96 TeV recorded by the CDF II detector. The asymmetry as a function of m(b (b) over bar) is consistent with zero, as well as with the predictions of the standard model. The measurement disfavors a simple model including an axigluon with a mass of 200 GeV/c(2), whereas a model containing a heavier 345 GeV/c(2) axigluon is not excluded.

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