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

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

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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 9.7fb-1 of proton-antiproton collisions at s=1.96TeV 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 expectations.

Original languageEnglish (US)
Article number052007
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume92
Issue number5
DOIs
StatePublished - Sep 22 2015

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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    Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Agnew, J. P., Alexeev, G. D., Alkhazov, G., Alton, A., Askew, A., Atkins, S., Augsten, K., Avila, C., Badaud, F., Bagby, L., Baldin, B., Bandurin, D. V., Banerjee, S., Barberis, E., ... 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 - Particles, Fields, Gravitation and Cosmology, 92(5), [052007]. https://doi.org/10.1103/PhysRevD.92.052007