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Measurement of the forward-backward asymmetry in the distribution of leptons in tt¯ events in the lepton+jets channel

Abazov, V. M. and Abbott, B. and Acharya, B. S. and Adams, M. and Adams, T. and Agnew, J. P. and Alexeev, G. D. and Alkhazov, G. and Alton, A. and Askew, A. and Atkins, S. and Augsten, K. and Avila, C. and Badaud, F. and Bagby, L. and Baldin, B. and Bandurin, D. V. and Banerjee, S. and Barberis, E. and Baringer, P. and Bartlett, J. F. and Bassler, U. and Bazterra, V. and Bean, A. and Begalli, M. and Bellantoni, L. and Beri, S. B. and Bernardi, G. and Bernhard, R. and Bertram, I. and Besanifmmode çelse çon, M. and Beuselinck, R. and Bhat, P. C. and Bhatia, S. and Bhatnagar, V. and Blazey, G. and Blessing, S. and Bloom, K. and Boehnlein, A. and Boline, D. and Boos, E. E. and Borissov, G. and Borysova, M. and Brandt, A. and Brandt, O. and Brock, R. and Bross, A. and Brown, D. and Bu, X. B. and Buehler, M. and Buescher, V. and Bunichev, V. and Burdin, S. and Buszello, C. P. and Camacho-Pérez, E. and Casey, B. C. K. and Castilla-Valdez, H. and Caughron, S. and Chakrabarti, S. and Chan, K. M. and Chandra, A. and Chapelain, A. and Chapon, E. and Chen, G. and Cho, S. W. and Choi, S. and Choudhary, B. and Cihangir, S. and Claes, D. and Clutter, J. and Cooke, M. and Cooper, W. E. and Corcoran, M. and Couderc, F. and Cousinou, M.-C. and Cutts, D. and Das, A. and Davies, G. and de Jong, S. J. and De La Cruz-Burelo, E. and Déliot, F. and Demina, R. and Denisov, D. and Denisov, S. P. and Desai, S. and Deterre, C. and DeVaughan, K. and Diehl, H. T. and Diesburg, M. and Ding, P. F. and Dominguez, A. and Dubey, A. and Dudko, L. V. and Duperrin, A. and Dutt, S. and Eads, M. and Edmunds, D. and Ellison, J. and Elvira, V. D. and Enari, Y. and Evans, H. and Evdokimov, V. N. and Falkowski, A. and Feng, L. and Ferbel, T. and Fiedler, F. and Filthaut, F. and Fisher, W. and Fisk, H. E. and Fortner, M. and Fox, H. and Fuess, S. and Garbincius, P. H. and Garcia-Bellido, A. and Garcia-González, J. A. and Gavrilov, V. and Geng, W. and Gerber, C. E. and Gershtein, Y. and Ginther, G. and Golovanov, G. and Grannis, P. D. and Greder, S. and Greenlee, H. and Grenier, G. and Gris, Ph. and Grivaz, J.-F. and Grohsjean, A. and Grünendahl, S. and Grünewald, M. W. and Guillemin, T. and Gutierrez, G. and Gutierrez, P. and Haley, J. and Han, L. and Harder, K. and Harel, A. and Hauptman, J. M. and Hays, J. and Head, T. and Hebbeker, T. and Hedin, D. and Hegab, H. and Heinson, A. P. and Heintz, U. and Hensel, C. and Heredia-De La Cruz, I. and Herner, K. and Hesketh, G. and Hildreth, M. D. and Hirosky, R. and Hoang, T. and Hobbs, J. D. and Hoeneisen, B. and Hogan, J. and Hohlfeld, M. and Holzbauer, J. L. and Howley, I. and Hubacek, Z. and Hynek, V. and Iashvili, I. and Ilchenko, Y. and Illingworth, R. and Ito, A. S. and Jabeen, S. and Jaffré, M. and Jayasinghe, A. and Jeong, M. S. and Jesik, R. and Jiang, P. and Johns, K. and Johnson, E. and Johnson, M. and Jonckheere, A. and Jonsson, P. and Joshi, J. and Jung, A. W. and Juste, A. and Kajfasz, E. and Karmanov, D. and Katsanos, I. and Kehoe, R. and Kermiche, S. and Khalatyan, N. and Khanov, A. and Kharchilava, A. and Kharzheev, Y. N. and Kiselevich, I. and Kohli, J. M. and Kozelov, A. V. and Kraus, J. and Kumar, A. and Kupco, A. and Kurifmmode eckcelse ca, T. and Kuzmin, V. A. and Lammers, S. and Lebrun, P. and Lee, H. S. and Lee, S. W. and Lee, W. M. and Lei, X. and Lellouch, J. and Li, D. and Li, H. and Li, L. and Li, Q. Z. and Lim, J. K. and Lincoln, D. and Linnemann, J. and Lipaev, V. V. and Lipton, R. and Liu, H. and Liu, Y. and Lobodenko, A. and Lokajicek, M. and Lopes de Sa, R. and Luna-Garcia, R. and Lyon, A. L. and Maciel, A. K. A. and Madar, R. and Magaña-Villalba, R. and Malik, S. and Malyshev, V. L. and Mansour, J. and Martinez-Ortega, J. and McCarthy, R. and McGivern, C. L. and Meijer, M. M. and Melnitchouk, A. and Menezes, D. and Mercadante, P. G. and Merkin, M. and Meyer, A. and Meyer, J. and Miconi, F. and Mondal, N. K. and Mulhearn, M. and Nagy, E. and Narain, M. and Nayyar, R. and Neal, H. A. and Negret, J. P. and Neustroev, P. and Nguyen, H. T. and Nunnemann, T. and Orbaker, D. and Orduna, J. and Osman, N. and Osta, J. and Pal, A. and Parashar, N. and Parihar, V. and Park, S. K. and Partridge, R. and Parua, N. and Patwa, A. and Penning, B. and Perfilov, M. and Peters, Y. and Petridis, K. and Petrillo, G. and Pétroff, P. and Pleier, M.-A. and Podstavkov, V. M. and Popov, A. V. and Prewitt, M. and Price, D. and Prokopenko, N. and Qian, J. and Quadt, A. and Quinn, B. and Ratoff, P. N. and Razumov, I. and Ripp-Baudot, I. and Rizatdinova, F. and Rominsky, M. and Ross, A. and Royon, C. and Rubinov, P. and Ruchti, R. and Sajot, G. and Sánchez-Hernández, A. and Sanders, M. P. and Santos, A. S. and Savage, G. and Sawyer, L. and Scanlon, T. and Schamberger, R. D. and Scheglov, Y. and Schellman, H. and Schwanenberger, C. and Schwienhorst, R. and Sekaric, J. and Severini, H. and Shabalina, E. and Shary, V. and Shaw, S. and Shchukin, A. A. and Simak, V. and Skubic, P. and Slattery, P. and Smirnov, D. and Snow, G. R. and Snow, J. and Snyder, S. and Söldner-Rembold, S. and Sonnenschein, L. and Soustruznik, K. and Stark, J. and Stoyanova, D. A. and Strauss, M. and Suter, L. and Svoisky, P. and Titov, M. and Tokmenin, V. V. and Tsai, Y.-T. and Tsybychev, D. and Tuchming, B. and Tully, C. and Uvarov, L. and Uvarov, S. and Uzunyan, S. and Van Kooten, R. and van Leeuwen, W. M. and Varelas, N. and Varnes, E. W. and Vasilyev, I. A. and Verkheev, A. Y. and Vertogradov, L. S. and Verzocchi, M. and Vesterinen, M. and Vilanova, D. and Vokac, P. and Wahl, H. D. and Wang, M. H. L. S. and Warchol, J. and Watts, G. and Wayne, M. and Weichert, J. and Welty-Rieger, L. and Williams, M. R. J. and Wilson, G. W. and Wobisch, M. and Wood, D. R. and Wyatt, T. R. and Xie, Y. and Yamada, R. and Yang, S. and Yasuda, T. and Yatsunenko, Y. A. and Ye, W. and Ye, Z. and Yin, H. and Yip, K. and Youn, S. W. and Yu, J. M. and Zennamo, J. and Zhao, T. G. and Zhou, B. and Zhu, J. and Zielinski, M. and Zieminska, D. and Zivkovic, L. (2014) Measurement of the forward-backward asymmetry in the distribution of leptons in tt¯ events in the lepton+jets channel. Physical Review D, 90. ISSN 1550-7998

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    Abstract

    We present measurements of the forward-backward asymmetry in the angular distribution of leptons from decays of top quarks and antiquarks produced in proton-antiproton collisions. We consider the final state containing a lepton and at least three jets. The entire sample of data collected by the D0 experiment during Run II of the Fermilab Tevatron Collider, corresponding to 9.7 fb−1 of integrated luminosity, is used. The asymmetry measured for reconstructed leptons is AlFB=(2.9±2.1(stat.)+1.5−1.7(syst.))%. When corrected for efficiency and resolution effects within the lepton rapidity coverage of |yl|<1.5, the asymmetry is found to be AlFB=(4.2±2.3(stat.)+1.7−2.0(syst.))%. We examine the dependence of AlFB on the transverse momentum and rapidity of the lepton. Combination with the asymmetry measured in the final states containing two leptons yields AlFB=(4.2±2.0(stat.)±1.4(syst.))%. The results are in agreement with predictions from the next-to-leading-order QCD generator mc@nlo, which predicts an asymmetry of AlFB=2.0% for |yl|<1.5.

    Item Type: Article
    Journal or Publication Title: Physical Review D
    Additional Information: © 2014 American Physical Society
    Subjects:
    Departments: Faculty of Science and Technology > Physics
    ID Code: 71528
    Deposited By: ep_importer_pure
    Deposited On: 29 Oct 2014 15:53
    Refereed?: Yes
    Published?: Published
    Last Modified: 21 Nov 2017 18:56
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/71528

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