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Simultaneous measurement of forward-backward asymmetry and top polarization in dilepton final states from tt¯ production at the Tevatron

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 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 Cuth, J. 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, A. and Evdokimov, V. N. and Fauré, 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 García-González, J. A. and Gavrilov, V. and Geng, W. and Gerber, C. E. and Gershtein, Y. and Ginther, G. and Gogota, O. 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 Kaur, M. 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 Martínez-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 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 Savitskyi, M. and Sawyer, L. and Scanlon, T. and Schamberger, R. D. and Scheglov, Y. and Schellman, H. and Schott, M. 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. (2015) Simultaneous measurement of forward-backward asymmetry and top polarization in dilepton final states from tt¯ production at the Tevatron. Physical Review D, 92 (5). ISSN 1550-7998

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    Abstract

    We present a simultaneous measurement of the forward-backward asymmetry and the top-quark polarization in tt¯ production in dilepton final states using 9.7 fb−1 of proton-antiproton collisions at s√=1.96 TeV with the D0 detector. To reconstruct the distributions of kinematic observables we employ a matrix element technique that calculates the likelihood of the possible tt¯ kinematic configurations. After accounting for the presence of background events and for calibration effects, we obtain a forward-backward asymmetry of Att¯=(15.0±6.4(stat)±4.9(syst))% and a top-quark polarization times spin analyzing power in the beam basis of κP=(7.2±10.5(stat)±4.2(syst))%, with a correlation of −56% between the measurements. If we constrain the forward-backward asymmetry to its expected standard model value, we obtain a measurement of the top polarization of κP=(11.3±9.1(stat)±1.9(syst))%. If we constrain the top polarization to its expected standard model value, we measure a forward-backward asymmetry of Att¯=(17.5±5.6(stat)±3.1(syst))%. A combination with the D0 Att¯ measurement in the lepton+jets final state yields an asymmetry of Att¯=(11.8±2.5(stat)±1.3(syst))%. Within their respective uncertainties, all these results are consistent with the standard model

    Item Type: Article
    Journal or Publication Title: Physical Review D
    Additional Information: © 2015 American Physical Society Published: 22/9/2015, Received 22/7/2015 Evidence of Acceptance not available
    Subjects:
    Departments: Faculty of Science and Technology > Physics
    ID Code: 75812
    Deposited By: ep_importer_pure
    Deposited On: 21 Oct 2015 05:59
    Refereed?: Yes
    Published?: Published
    Last Modified: 21 Nov 2017 19:10
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/75812

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