Measurement of the fraction of tt¯ production via gluon-gluon fusion in pp¯ collisions at s=1.96 TeV
T. Aaltonen,J. Adelman,T. Akimoto,M. Albrow,B. Álvarez González,S. Amerio, D. Amidei, A. Anastassov, A. Annovi, J. Antos, G. Apollinari, A. Apresyan,T. Arisawa,A. Artikov,W. Ashmanskas,A. Attal,A. Aurisano, F. Azfar,P. Azzurri,W. Badgett, A. Barbaro-Galtieri,V. Barnes,B. Barnett,V. Bartsch,G. Bauer,P.-H. Beauchemin, F. Bedeschi,P. Bednar,D. Beecher,S. Behari, G. Bellettini, J. Bellinger,D. Benjamin, A. Beretvas, J. Beringer,A. Bhatti,M. Binkley, D. Bisello,I. Bizjak,R. Blair,C. Blocker, B. Blumenfeld, A. Bocci,A. Bodek, V. Boisvert, G. Bolla,D. Bortoletto,J. Boudreau, A. Boveia, B. Brau,A. Bridgeman, L. Brigliadori, C. Bromberg,E. Brubaker, J. Budagov,H. Budd,S. Budd, K. Burkett,G. Busetto, P. Bussey,A. Buzatu,K. Byrum,S. Cabrera,C. Calancha,M. Campanelli, M. Campbell, F. Canelli, A. Canepa, 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,S. Chang,Y. Chen, M. Chertok, G. Chiarelli,G. Chlachidze, F. Chlebana,K. Cho,D. Chokheli,J. Chou, G. Choudalakis,S. Chuang,K. Chung,W. Chung,Y. Chung, C. Ciobanu,M. Ciocci,A. Clark,D. Clark,G. Compostella,M. Convery,J. Conway, K. Copic,M. Cordelli, G. Cortiana,D. Cox, F. Crescioli,C. Cuenca Almenar,J. Cuevas, R. Culbertson, J. Cully,D. Dagenhart,M. Datta,T. Davies,P. de Barbaro,S. De Cecco, A. Deisher,G. De Lorenzo,M. Dell’Orso, C. Deluca, L. Demortier,J. Deng, M. Deninno,P. Derwent,G. di Giovanni, C. Dionisi,B. Di Ruzza, J. Dittmann,M. D’Onofrio, S. Donati,P. Dong, J. Donini, T. Dorigo,S. Dube, J. Efron,A. Elagin, R. Erbacher, D. Errede, S. Errede, R. Eusebi,H. Fang,S. Farrington, W. Fedorko, R. Feild, M. Feindt,J. Fernandez,C. Ferrazza, R. Field, G. Flanagan,R. Forrest,M. Franklin, J. Freeman, I. Furic, M. Gallinaro,J. Galyardt, F. Garberson,J. Garcia, A. Garfinkel,K. Genser,H. Gerberich, D. Gerdes, A. Gessler, S. Giagu, V. Giakoumopoulou, P. Giannetti,K. Gibson,J. Gimmell, C. Ginsburg, N. Giokaris,M. Giordani,P. Giromini, M. Giunta, G. Giurgiu,V. Glagolev,D. Glenzinski,M. Gold,N. Goldschmidt,A. Golossanov,G. Gomez,G. Gomez-Ceballos, M. Goncharov,O. González,I. Gorelov,A. Goshaw, K. Goulianos,A. Gresele,S. Grinstein,C. Grosso-Pilcher,R. Group, U. Grundler,J. Guimaraes da Costa,Z. Gunay-Unalan, C. Haber,K. Hahn,S. Hahn, E. Halkiadakis,B.-Y. Han,J. Han,R. Handler,F. Happacher, K. Hara,D. Hare,M. Hare, S. Harper, R. Harr,R. Harris, M. Hartz, K. Hatakeyama, J. Hauser,C. Hays,M. Heck,A. Heijboer,B. Heinemann,J. Heinrich,C. Henderson,M. Herndon,J. Heuser, S. Hewamanage, D. Hidas,C. Hill, D. Hirschbuehl, A. Hocker,S. Hou, M. Houlden, S.-C. Hsu,B. Huffman, R. Hughes, U. Husemann, J. Huston, J. Incandela, G. Introzzi,M. Iori, A. Ivanov, E. James,B. Jayatilaka,E. Jeon,M. Jha, S. Jindariani,W. Johnson,M. Jones,K. Joo,S. Jun,J. Jung,T. Junk, T. Kamon,D. Kar, P. Karchin,Y. Kato,R. Kephart,J. Keung, V. Khotilovich, B. Kilminster,D. Kim,H. Kim,J. Kim,M. Kim, S. Kim,Y. Kim, N. Kimura, L. Kirsch,S. Klimenko,B. 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Totaro, S. Tourneur,Y. Tu, N. Turini, F. Ukegawa, S. Vallecorsa,N. van Remortel,A. Varganov,E. Vataga,F. Vázquez,G. Velev,C. Vellidis, V. Veszpremi,M. Vidal,R. Vidal, I. Vila,R. Vilar,T. Vine,M. Vogel, I. Volobouev, G. Volpi, F. Würthwein,P. Wagner,R. Wagner, J. Wagner-Kuhr, W. Wagner,T. Wakisaka,R. Wallny,S. Wang, A. Warburton, D. Waters,M. Weinberger, W. Wester, B. Whitehouse, D. Whiteson, A. Wicklund, E. Wicklund,G. Williams,H. Williams,P. Wilson,B. Winer,P. Wittich,S. Wolbers,C. Wolfe,T. Wright,X. Wu,S. Wynne,S. Xie, A. Yagil, K. Yamamoto, J. Yamaoka,U. Yang,Y. Yang, W. Yao,G. Yeh, J. Yoh, K. Yorita,T. Yoshida, G. Yu, I. Yu,S. Yu,J. Yun, L. Zanello, A. Zanetti,I. Zaw,X. Zhang,Y. Zheng,S. Zucchelli
PHYSICAL REVIEW D（2009）
引用 21|浏览244
摘要
We present a measurement of the ratio of the t (t) over bar production cross section via gluon-gluon fusion to the total t (t) over bar production cross section in p (p) over bar collisions at root s = 1.96 Tev at the Tevatron. Using a data sample with an integrated luminosity of 955 pb(-1) recorded by the CDF II detector at Fermilab, we select events based on the t (t) over bar decay to lepton + jets. Using an artificial neural network technique we discriminate between t (t) over bar events produced via q (q) over bar annihilation and gg fusion, and find G(f) = sigma(gg -> t (t) over bar/sigma(p (p) over bar -> t (t) over bar) < 0.33 at the 68% confidence level. This result is combined with a previous measurement to obtain the most stringent measurement of this quantity by CDF to date, G(f) = 0.07(-0.07)(+0.15).
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