CERN Accelerating science

Article
Report number arXiv:1507.05666 ; FERMILAB-PUB-15-312-E ; FERMILAB-PUB-15-312-E
Title Simultaneous measurement of forward-backward asymmetry and top polarization in dilepton final states from $t\bar t$ production at the Tevatron
Related titleSimultaneous measurement of forward-backward asymmetry and top polarization in dilepton final states from $t\bar t$ production at the Tevatron
Author(s)

Abazov, Victor Mukhamedovich (Dubna, JINR) ; Abbott, Braden Keim (Oklahoma U.) ; Acharya, Bannanje Sripath (Tata Inst.) ; Adams, Mark Raymond (Illinois U., Chicago) ; Adams, Todd (Florida State U.) ; Agnew, James P (Manchester U., Comp. Sci. Dept.) ; Alexeev, Guennadi D (Dubna, JINR) ; Alkhazov, Georgiy D (St. Petersburg, INP) ; Alton, Andrew K (Michigan U. ; Augustana Coll., Sioux Falls) ; Askew, Andrew Warren (Florida State U.) ; Atkins, Scott (Louisiana Tech. U.) ; Augsten, Kamil (Prague, Tech. U.) ; Avila, Carlos A (Andes U., Bogota) ; Badaud, Frederique (Clermont-Ferrand U.) ; Bagby, Linda F (Fermilab) ; Baldin, Boris (Fermilab) ; Bandurin, Dmitry V (Virginia U.) ; Banerjee, Sunanda (Tata Inst.) ; Barberis, Emanuela (Northeastern U.) ; Baringer, Philip S (Kansas U.) ; Bartlett, JFrederick (Fermilab) ; Bassler, Ursula Rita (DAPNIA, Saclay) ; Bazterra, Victor (Illinois U., Chicago) ; Bean, Alice L (Kansas U.) ; Begalli, Marcia (Rio de Janeiro State U.) ; Bellantoni, Leo (Fermilab) ; Beri, Suman B (Panjab U.) ; Bernardi, Gregorio (Paris U., VI-VII) ; Bernhard, Ralf Patrick (Freiburg U.) ; Bertram, Iain A (Lancaster U.) ; Besancon, Marc (DAPNIA, Saclay) ; Beuselinck, Raymond (Imperial Coll., London) ; Bhat, Pushpalatha C (Fermilab) ; Bhatia, Sudeep (Mississippi U.) ; Bhatnagar, Vipin (Panjab U.) ; Blazey, Gerald Charles (Northern Illinois U.) ; Blessing, Susan K (Florida State U.) ; Bloom, Kenneth A (Nebraska U.) ; Boehnlein, Amber S (Fermilab) ; Boline, Daniel Dooley (SUNY, Stony Brook) ; Boos, Edward E (Moscow State U.) ; Borissov, Guennadi (Lancaster U.) ; Borysova, Maryna (Taras Shevchenko U. ; Kiev, INR) ; Brandt, Andrew (Texas U., Arlington) ; Brandt, Oleg (Gottingen U., Zweites Phys. Inst.) ; Brock, Raymond L (Michigan State U.) ; Bross, Alan D (Fermilab) ; Brown, Duncan Paul (Paris U., VI-VII) ; Bu, Xue-Bing (Fermilab) ; Buehler, Marc (Fermilab) ; Buescher, Volker (Mainz U., Inst. Phys.) ; Bunichev, Viacheslav Yevgenyevich (Moscow State U.) ; Burdin, Sergey (Lancaster U. ; Liverpool U.) ; Buszello, Claus Peter (Uppsala U.) ; Camacho-Perez, Enrique (CINVESTAV, IPN) ; Casey, Brendan Cameron Kieran (Fermilab) ; Castilla-Valdez, Heriberto (CINVESTAV, IPN) ; Caughron, Seth Aaron (Michigan State U.) ; Chakrabarti, Subhendu (SUNY, Stony Brook) ; Chan, Kwok Ming Leo (Notre Dame U.) ; Chandra, Avdhesh (Rice U.) ; Chapon, Emilien (DAPNIA, Saclay) ; Chen, Guo (Kansas U.) ; Cho, Sung-Woong (Korea U., KODEL) ; Choi, Suyong (Korea U., KODEL) ; Choudhary, Brajesh C (Delhi U.) ; Cihangir, Selcuk (Fermilab) ; Claes, Daniel R (Nebraska U.) ; Clutter, Justace Randall (Kansas U.) ; Cooke, Michael P (Fermilab ; AAAS, Washington, D.C.) ; Cooper, William Edward (Fermilab) ; Corcoran, Marjorie D (Rice U.) ; Couderc, Fabrice (DAPNIA, Saclay) ; Cousinou, Marie-Claude (Marseille, CPPM) ; Cuth, Jakub (Mainz U., Inst. Phys.) ; Cutts, David (Brown U.) ; Das, Amitabha (Southern Methodist U.) ; Davies, Gavin John (Imperial Coll., London) ; de Jong, Sijbrand Jan (NIKHEF, Amsterdam ; Nijmegen U.) ; De La Cruz-Burelo, Eduard (CINVESTAV, IPN) ; Deliot, Frederic (DAPNIA, Saclay) ; Demina, Regina (Rochester U.) ; Denisov, Dmitri S (Fermilab) ; Denisov, Sergei P (Serpukhov, IHEP) ; Desai, Satish Vijay (Fermilab) ; Deterre, Cecile (Manchester U., Comp. Sci. Dept. ; DESY) ; DeVaughan, Kayle Otis (Nebraska U.) ; Diehl, HThomas (Fermilab) ; Diesburg, Michael (Fermilab) ; Ding, Pengfei (Manchester U., Comp. Sci. Dept.) ; Dominguez, DAaron M (Nebraska U.) ; Dubey, Abhinav Kumar (Delhi U.) ; Dudko, Lev V (Moscow State U.) ; Duperrin, Arnaud (Marseille, CPPM) ; Dutt, Suneel (Panjab U.) ; Eads, Michael T (Northern Illinois U.) ; Edmunds, Daniel L (Michigan State U.) ; Ellison, John A (UC, Riverside) ; Elvira, VDaniel (Fermilab) ; Enari, Yuji (Paris U., VI-VII) ; Evans, Harold G (Indiana U.) ; Evdokimov, Anatoly V (Illinois U., Chicago) ; Evdokimov, Valeri N (Serpukhov, IHEP) ; Faure, Alexandre (DAPNIA, Saclay) ; Feng, Lei (Northern Illinois U.) ; Ferbel, Thomas (Rochester U.) ; Fiedler, Frank (Mainz U., Inst. Phys.) ; Filthaut, Frank (NIKHEF, Amsterdam ; Nijmegen U.) ; Fisher, Wade Cameron (Michigan State U.) ; Fisk, HEugene (Fermilab) ; Fortner, Michael R (Northern Illinois U.) ; Fox, Harald (Lancaster U.) ; Fuess, Stuart C (Fermilab) ; Garbincius, Peter H (Fermilab) ; Garcia-Bellido, Aran (Rochester U.) ; Garcia-Gonzalez, Jose Andres (CINVESTAV, IPN) ; Gavrilov, Vladimir B (Moscow, ITEP) ; Geng, Weigang (Marseille, CPPM ; Michigan State U.) ; Gerber, Cecilia Elena (Illinois U., Chicago) ; Gershtein, Yuri S (Rutgers U., Piscataway) ; Ginther, George E (Fermilab ; Rochester U.) ; Gogota, Olga (Taras Shevchenko U.) ; Golovanov, Georgy Anatolievich (Dubna, JINR) ; Grannis, Paul D (SUNY, Stony Brook) ; Greder, Sebastien (Louis Pasteur U., Strasbourg I) ; Greenlee, Herbert B (Fermilab) ; Grenier, Gerald Jean (Lyon, IPN) ; Gris, Phillipe Luc (Clermont-Ferrand U.) ; Grivaz, Jean-Francois (Orsay, LAL) ; Grohsjean, Alexander (DAPNIA, Saclay ; DESY) ; Gruenendahl, Stefan (Fermilab) ; Gruenewald, Martin Werner (University Coll., Dublin) ; Guillemin, Thibault (Orsay, LAL) ; Gutierrez, Gaston R (Fermilab) ; Gutierrez, Phillip (Oklahoma U.) ; Haley, Joseph Glenn Biddle (Oklahoma State U.) ; Han, Liang (Hefei, CUST) ; Harder, Kristian (Manchester U., Comp. Sci. Dept.) ; Harel, Amnon (Rochester U.) ; Hauptman, John Michael (Iowa State U.) ; Hays, Jonathan M (Imperial Coll., London) ; Head, Tim (Manchester U., Comp. Sci. Dept.) ; Hebbeker, Thomas (Aachen, Tech. Hochsch.) ; Hedin, David R (Northern Illinois U.) ; Hegab, Hatim (Oklahoma State U.) ; Heinson, Ann (UC, Riverside) ; Heintz, Ulrich (Brown U.) ; Hensel, Carsten (Rio de Janeiro, CBPF) ; Heredia-De La Cruz, Ivan (CINVESTAV, IPN ; Conacyt, Mexico) ; Herner, Kenneth Richard (Fermilab) ; Hesketh, Gavin G (Manchester U., Comp. Sci. Dept. ; University Coll. London) ; Hildreth, Michael D (Notre Dame U.) ; Hirosky, Robert James (Virginia U.) ; Hoang, Trang (Florida State U.) ; Hobbs, John D (SUNY, Stony Brook) ; Hoeneisen, Bruce (San Francisco de Quito U.) ; Hogan, Julie (Rice U.) ; Hohlfeld, Mark (Mainz U., Inst. Phys.) ; Holzbauer, Jenny Lyn (Mississippi U.) ; Howley, Ian James (Texas U., Arlington) ; Hubacek, Zdenek (Prague, Tech. U. ; DAPNIA, Saclay) ; Hynek, Vlastislav (Prague, Tech. U.) ; Iashvili, Ia (SUNY, Buffalo) ; Ilchenko, Yuriy (Southern Methodist U.) ; Illingworth, Robert A (Fermilab) ; Ito, Albert S (Fermilab) ; Jabeen, Shabnam (Fermilab ; Maryland U., College Park) ; Jaffre, Michel J (Orsay, LAL) ; Jayasinghe, Ayesh (Oklahoma U.) ; Jeong, Min-Soo (Korea U., KODEL) ; Jesik, Richard L (Imperial Coll., London) ; Jiang, Peng (Hefei, CUST) ; Johns, Kenneth Arthur (Arizona U.) ; Johnson, Emily (Michigan State U.) ; Johnson, Marvin E (Fermilab) ; Jonckheere, Alan M (Fermilab) ; Jonsson, Per Martin (Imperial Coll., London) ; Joshi, Jyoti (UC, Riverside) ; Jung, Andreas Werner (Fermilab) ; Juste, Aurelio (ICREA, Barcelona) ; Kajfasz, Eric (Marseille, CPPM) ; Karmanov, Dmitriy Y (Moscow State U.) ; Katsanos, Ioannis (Nebraska U.) ; Kaur, Manbir (Panjab U.) ; Kehoe, Robert Leo Patrick (Southern Methodist U.) ; Kermiche, Smain (Marseille, CPPM) ; Khalatyan, Norayr (Fermilab) ; Khanov, Alexander (Oklahoma State U.) ; Kharchilava, Avto (SUNY, Buffalo) ; Kharzheev, Yuri N (Dubna, JINR) ; Kiselevich, Ivan Lvovich (Moscow, ITEP) ; Kohli, Jatinder M (Panjab U.) ; Kozelov, Alexander V (Serpukhov, IHEP) ; Kraus, James Alexander (Mississippi U.) ; Kumar, Ashish (SUNY, Buffalo) ; Kupco, Alexander (Prague, Inst. Phys.) ; Kurca, Tibor (Lyon, IPN) ; Kuzmin, Valentin Alexandrovich (Moscow State U.) ; Lammers, Sabine Wedam (Indiana U.) ; Lebrun, Patrice (Lyon, IPN) ; Lee, Hyeon-Seung (Korea U., KODEL) ; Lee, Seh-Wook (Iowa State U.) ; Lee, William M (Fermilab) ; Lei, Xiaowen (Arizona U.) ; Lellouch, Jeremie (Paris U., VI-VII) ; Li, Dikai (Paris U., VI-VII) ; Li, Hengne (Virginia U.) ; Li, Liang (UC, Riverside) ; Li, Qi-Zhong (Fermilab) ; Lim, Jeong Ku (Korea U., KODEL) ; Lincoln, Donald W (Fermilab) ; Linnemann, James Thomas (Michigan State U.) ; Lipaev, Vladimir V (Serpukhov, IHEP) ; Lipton, Ronald J (Fermilab) ; Liu, Huanzhao (Southern Methodist U.) ; Liu, Yanwen (Hefei, CUST) ; Lobodenko, Alexandre (St. Petersburg, INP) ; Lokajicek, Milos (Prague, Inst. Phys.) ; Lopes de Sa, Rafael (Fermilab) ; Luna-Garcia, Rene (CINVESTAV, IPN ; CIC, IPN) ; Lyon, Adam Leonard (Fermilab) ; Maciel, Arthur KA (Rio de Janeiro, CBPF) ; Madar, Romain (Freiburg U.) ; Magana-Villalba, Ricardo (CINVESTAV, IPN) ; Malik, Sudhir (Nebraska U.) ; Malyshev, Vladimir L (Dubna, JINR) ; Mansour, Jason (Gottingen U., Zweites Phys. Inst.) ; Martinez-Ortega, Jorge (CINVESTAV, IPN) ; McCarthy, Robert L (SUNY, Stony Brook) ; Mcgivern, Carrie Lynne (Manchester U., Comp. Sci. Dept.) ; Meijer, Melvin M (NIKHEF, Amsterdam ; Nijmegen U.) ; Melnitchouk, Alexander S (Fermilab) ; Menezes, Diego D (Northern Illinois U.) ; Mercadante, Pedro Galli (ABC Federal U.) ; Merkin, Mikhail M (Moscow State U.) ; Meyer, Arnd (Aachen, Tech. Hochsch.) ; Meyer, Jorg Manfred (Gottingen U., Zweites Phys. Inst. ; KIT, Karlsruhe, SCC) ; Miconi, Florian (Louis Pasteur U., Strasbourg I) ; Mondal, Naba K (Tata Inst.) ; Mulhearn, Michael James (Virginia U.) ; Nagy, Elemer (Marseille, CPPM) ; Narain, Meenakshi (Brown U.) ; Nayyar, Ruchika (Arizona U.) ; Neal, Homer A (Michigan U.) ; Negret, Juan Pablo (Andes U., Bogota) ; Neustroev, Petr V (St. Petersburg, INP) ; Nguyen, Huong Thi (Virginia U.) ; Nunnemann, Thomas P (Munich U.) ; Hernandez Orduna, Jose de Jesus (Rice U.) ; Osman, Nicolas Ahmed (Marseille, CPPM) ; Osta, Jyotsna (Notre Dame U.) ; Pal, Arnab (Texas U., Arlington) ; Parashar, Neeti (Purdue U., Calumet) ; Parihar, Vivek (Brown U.) ; Park, Sung Keun (Korea U., KODEL) ; Partridge, Richard A (Brown U. ; SLAC) ; Parua, Nirmalya (Indiana U.) ; Patwa, Abid (Brookhaven ; Dept. of Energy, Wash., D.C.) ; Penning, Bjoern (Imperial Coll., London) ; Perfilov, Maxim Anatolyevich (Moscow State U.) ; Peters, Reinhild Yvonne Fatima (Manchester U., Comp. Sci. Dept.) ; Petridis, Konstantinos (Manchester U., Comp. Sci. Dept.) ; Petrillo, Gianluca (Rochester U.) ; Petroff, Pierre (Orsay, LAL) ; Pleier, Marc-Andre (Brookhaven) ; Podstavkov, Vladimir M (Fermilab) ; Popov, Alexey V (Serpukhov, IHEP) ; Prewitt, Michelle (Rice U.) ; Price, Darren (Manchester U., Comp. Sci. Dept.) ; Prokopenko, Nikolay N (Serpukhov, IHEP) ; Qian, Jianming (Michigan U.) ; Quadt, Arnulf (Gottingen U., Zweites Phys. Inst.) ; Quinn, Gene Breese (Mississippi U.) ; Ratoff, Peter N (Lancaster U.) ; Razumov, Ivan A (Serpukhov, IHEP) ; Ripp-Baudot, Isabelle (Louis Pasteur U., Strasbourg I) ; Rizatdinova, Flera (Oklahoma State U.) ; Rominsky, Mandy Kathleen (Fermilab) ; Ross, Anthony (Lancaster U.) ; Royon, Christophe (DAPNIA, Saclay) ; Rubinov, Paul Michael (Fermilab) ; Ruchti, Randal C (Notre Dame U.) ; Sajot, Gerard (LPSC, Grenoble) ; Sanchez-Hernandez, Alberto (CINVESTAV, IPN) ; Sanders, Michiel P (Munich U.) ; Santos, Angelo Souza (Rio de Janeiro, CBPF ; Sao Paulo, IFT) ; Savage, David G (Fermilab) ; Savitskyi, Mykola (Taras Shevchenko U.) ; Sawyer, HLee (Louisiana Tech. U.) ; Scanlon, Timothy P (Imperial Coll., London) ; Schamberger, RDean (SUNY, Stony Brook) ; Scheglov, Yury A (St. Petersburg, INP) ; Schellman, Heidi M (Northwestern U.) ; Schott, Matthias (Mainz U., Inst. Phys.) ; Schwanenberger, Christian (Manchester U., Comp. Sci. Dept.) ; Schwienhorst, Reinhard H (Michigan State U.) ; Sekaric, Jadranka (Kansas U.) ; Severini, Horst (Oklahoma U.) ; Shabalina, Elizaveta K (Gottingen U., Zweites Phys. Inst.) ; Shary, Viacheslav V (DAPNIA, Saclay) ; Shaw, Savanna (Manchester U., Comp. Sci. Dept.) ; Shchukin, Andrey A (Serpukhov, IHEP) ; Simak, Vladislav J (Prague, Tech. U.) ; Skubic, Patrick Louis (Oklahoma U.) ; Slattery, Paul F (Rochester U.) ; Smirnov, Dmitri V (Notre Dame U.) ; Snow, Gregory R (Nebraska U.) ; Snow, Joel Mark (Langston U.) ; Snyder, Scott Stuart (Brookhaven) ; Soldner-Rembold, Stefan (Manchester U., Comp. Sci. Dept.) ; Sonnenschein, Lars (Aachen, Tech. Hochsch.) ; Soustruznik, Karel (Charles U.) ; Stark, Jan (LPSC, Grenoble) ; Stoyanova, Dina A (Serpukhov, IHEP) ; Strauss, Michael G (Oklahoma U.) ; Suter, Louise (Manchester U., Comp. Sci. Dept.) ; Svoisky, Peter V (Oklahoma U.) ; Titov, Maxim (DAPNIA, Saclay) ; Tokmenin, Valeriy V (Dubna, JINR) ; Tsai, Yun-Tse (Rochester U.) ; Tsybychev, Dmitri (SUNY, Stony Brook) ; Tuchming, Boris (DAPNIA, Saclay) ; Tully, Christopher George T (Princeton U.) ; Uvarov, Lev (St. Petersburg, INP) ; Uvarov, Sergey L (St. Petersburg, INP) ; Uzunyan, Sergey A (Northern Illinois U.) ; Van Kooten, Richard J (Indiana U.) ; van Leeuwen, Willem M (NIKHEF, Amsterdam) ; Varelas, Nikos (Illinois U., Chicago) ; Varnes, Erich W (Arizona U.) ; Vasilyev, Igor A (Serpukhov, IHEP) ; Verkheev, Alexander Yurievich (Dubna, JINR) ; Vertogradov, Leonid S (Dubna, JINR) ; Verzocchi, Marco (Fermilab) ; Vesterinen, Mika (Manchester U., Comp. Sci. Dept.) ; Vilanova, Didier (DAPNIA, Saclay) ; Vokac, Petr (Prague, Tech. U.) ; Wahl, Horst D (Florida State U.) ; Wang, Michael HLS (Fermilab) ; Warchol, Jadwiga (Notre Dame U.) ; Watts, Gordon Thomas (Washington U., Seattle) ; Wayne, Mitchell R (Notre Dame U.) ; Weichert, Jonas (Mainz U., Inst. Phys.) ; Welty-Rieger, Leah Christine (Northwestern U.) ; Williams, Mark Richard James (Indiana U. ; CERN) ; Wilson, Graham Wallace (Kansas U.) ; Wobisch, Markus (Louisiana Tech. U.) ; Wood, Darien Robert (Northeastern U.) ; Wyatt, Terence R (Manchester U., Comp. Sci. Dept.) ; Xie, Yunhe (Fermilab) ; Yamada, Ryuji (Fermilab) ; Yang, Siqi (Hefei, CUST) ; Yasuda, Takahiro (Fermilab) ; Yatsunenko, Yuriy A (Dubna, JINR) ; Ye, Wanyu (SUNY, Stony Brook) ; Ye, Zhenyu (Fermilab) ; Yin, Hang (Fermilab) ; Yip, Kin (Brookhaven) ; Youn, Sungwoo (Fermilab) ; Yu, Jiaming (Michigan U.) ; Zennamo, Joseph (SUNY, Buffalo) ; Zhao, Tianqi Gilbert (Manchester U., Comp. Sci. Dept.) ; Zhou, Bing (Michigan U.) ; Zhu, Junjie (Michigan U.) ; Zielinski, Marek (Rochester U.) ; Zieminska, Daria (Indiana U.) ; Zivkovic, Lidija (Paris U., VI-VII)

Publication 2015-09-22
Imprint 20 Jul 2015
Number of pages 16
Note 16 pages, 16 figures, published version
In: Phys. Rev. D 92 (2015) 052007
DOI 10.1103/PhysRevD.92.052007
Subject category Particle Physics - Experiment
Abstract We present a simultaneous measurement of the forward-backward asymmetry and the top-quark polarization in $t\bar t$ production in dilepton final states using 9.7 fb$^{-1}$ of proton-antiproton collisions at $\sqrt{s}=1.96$ 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 $t\bar t$ kinematic configurations. After accounting for the presence of background events and for calibration effects, we obtain a forward-backward asymmetry of $A^{t\bar t} = (15.0 \pm 6.4 \text{ (stat)} \pm 4.9 \text{ (syst)})\%$ and a top-quark polarization times spin analyzing power in the beam basis of $\kappa P = (7.2 \pm 10.5 \text{ (stat)} \pm 4.2 \text{ (syst)})\%$, 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 $\kappa P = (11.3 \pm 9.1 \text{ (stat)} \pm 1.9 \text{ (syst)})\%.$ If we constrain the top polarization to its expected standard model value, we measure a forward-backward asymmetry of $A^{t\bar t} = (17.5 \pm 5.6 \text{ (stat)} \pm 3.1 \text{ (syst)})\%.$ A combination with the D0 $A^{t\bar t}$ measurement in the lepton+jets final state yields an asymmetry of $ A^{t\bar t} = (11.8 \pm 2.5 \text{ (stat)} \pm 1.3 \text{ (syst)})\% . $ Within their respective uncertainties, all these results are consistent with the standard model expectations.
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Publication: © 2015-2024 American Physical Society



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