Spin Correlation intt¯Production frompp¯Collisions at√s=1.8TeV

Autor: A. N. Galyaev, D. K. Cho, D. Fein, B. May, Don Lincoln, W. E. Cooper, Daniel R Claes, R. A. Sidwell, Daniel John Karmgard, C. Hebert, Robert Hirosky, B. Gobbi, Anurag Gupta, N. Amos, M. Abolins, Jing Li, D. Mihalcea, Jasvinder A. Singh, B. Connolly, W. Y. Chen, Richard Breedon, N.V. Mokhov, G. Gutierrez, Gilvan Alves, A. P. Heinson, M. Sosebee, S. A. Jerger, A. Leflat, M. Merkin, R. E. Hall, N. K. Mondal, J. L. González Solís, T. Rockwell, Iain Alexander Bertram, Z. Casilum, Emanuela Barberis, H. T. Diehl, H. Singh, R. L. McCarthy, V. S. Narasimham, Thomas G Trippe, J. Bantly, W. G. Cobau, M. I. Martin, N. W. Reay, Michael Rijssenbeek, A. Boehnlein, Raymond Brock, Boaz Klima, L. T. Goss, J. Ellison, Neeti Parashar, A. K.A. Maciel, M. Chung, S. Fuess, S. Tentindo-Repond, J. McDonald, V. N. Evdokimov, D. Norman, S. Willis, M. Zielinski, S. Krzywdzinski, Ron Lipton, M. Roco, J. Womersley, Andrew Brandt, D. Karmanov, S. Negroni, Brajesh C Choudhary, Andrew White, J. Snow, Vladimir Gavrilov, A. Zylberstejn, Bobby Samir Acharya, H. A. Neal, R. Engelmann, H. C. Shankar, J. T. Linnemann, V. Sorín, K. Yip, J. A. Wightman, N. I. Bojko, L. Stutte, Jinhong Yu, A.S. Dyshkant, Gordon Watts, Philip Baringer, F. Lehner, H. Greenlee, G. Eppley, Suyong Choi, Chris Hays, E. A. Kozlovsky, H.E. Miettinen, A. Bross, R. D. Martin, H. da Motta, J. G.R. Lima, H. Haggerty, V. A. Bezzubov, V. Sirotenko, O. V. Eroshin, J. P. Negret, T. Heuring, P. Grudberg, S. Banerjee, Phillip Gutierrez, M. L. Stevenson, Serban Protopopescu, R. P. Smith, T. McMahon, J. S. Hoftun, K. Davis, J. N. Butler, P. D. Grannis, H. Piekarz, M. Bhattacharjee, Ulrich Heintz, H. Jöstlein, E. Popkov, John Hobbs, A. S. Ito, B. Baldin, C. S. Mishra, Michael Shupe, G. Guglielmo, Y. Ducros, K. Del Signore, J. Estrada, D. Edmunds, G. Di Loreto, Gregorio Bernardi, D. Denisov, Sharon Hagopian, M. Diesburg, J. Tarazi, E. G. Zverev, Sergey Kuleshov, Vasken Hagopian, Andre Sznajder, Yuri Gershtein, Victor Daniel Elvira, T. Fahland, V. Buescher, F. Stichelbaut, U. Bassler, R. Gilmartin, M. Fortner, Srinivasan Rajagopalan, Elemer Nagy, M. D. Peters, Hal Evans, H. Weerts, A. V. Kotwal, Lev Dudko, S. Youssef, E. W. Anderson, Thomas Ferbel, Harrison Prosper, P. M. Tuts, Robert Kehoe, V. Zutshi, T. McKibben, E. Flattum, J. Perkins, J. G. Lu, Q. Z. Li, L. Oesch, R. W. Stephens, L. Babukhadia, P. I. Goncharov, C. Miao, Alberto Santoro, Meenakshi Narain, Michael A. Strauss, V.V. Abramov, Alexander Belyaev, Ariel Schwartzman, E. Smith, Matthew Jones, S. N. Gurzhiev, Patrick Slattery, Seong Keun Kim, Allen Mincer, P. Yamin, Sebastian Grinstein, D. Toback, B. Olivier, Heriberto Castilla-Valdez, R. Piegaia, Arnaud Lucotte, R. J. Madaras, D. A. Stoyanova, R. Snihur, Gervasio Gomez, A. V. Kostritskiy, T. Joffe-Minor, Viatcheslav Stolin, N. Parua, Randy Ruchti, S. Mani, Sissel Hansen, Alexander Vorobiev, Y. Kulik, H. E. Fisk, F. Fleuret, R. Jesik, L. Coney, L. J. Pan, Suman Bala Beri, N. Sen, C. Lundstedt, N. R. Stanton, D. Cullen-Vidal, K. Genser, Z. Zhou, J. Solomon, D. Hedin, A. Juste, P. Padley, Alexey Volkov, S. Feher, James H Cochran, Mitchell Wayne, H. Schellman, J. M. Kohli, Peter W. Draper, Stefan Grünendahl, J. Thompson, B. Gómez, J. M. Hauptman, Z. H. Zhu, Shashikant Dugad, Cecilia Elena Gerber, V. V. Babintsev, A. S. Turcot, G. Ginther, K. S. Hahn, Jianming Qian, G. Briskin, Jeffrey F. Krane, D. Cutts, A. Jonckheere, Stephan Linn, Wagner Carvalho, A. Zieminski, N. Oshima, Daria Zieminska, R. D. Schamberger, K. M. Chan, Dhiman Chakraborty, M. A. Kubantsev, Pushpalatha C Bhat, Greg Landsberg, K. Gounder, M. A.C. Cummings, B. Hoeneisen, Lee Sawyer, S. Y. Jun, B. G. Pope, T. L.T. Thomas, Haiyan Wang, S.A. Kahn, M. Demarteau, G. Steinbrück, M. Paterno, Rajendran Raja, Brad Abbott, A. Baden, G. C. Blazey, D. Buchholz, R. Yamada, Elizaveta Shabalina, Orin I. Dahl, John Rutherfoord, J. T. White, Mary Beth Adams, S. Chopra, Anna Goussiou, James C. Green, F. Borcherding, Gregory R Snow, M. H.G. Souza, Miguel Mostafa, M. M. Baarmand, Sarah Catherine Eno, H. E. Montgomery, Z. Yu, Daniel Whiteson, K. M. Mauritz, F. Nang, P.F. Ermolov, V. S. Burtovoi, Shuichi Kunori, V. Vaniev, K. Streets, Vipin Bhatnagar, D. Shpakov, R. Partridge, H. Zheng, P. Hanlet, D. Coppage, S. Reucroft, H. S. Mao, H. L. Melanson, P. Z. Quintas, D. P. Stoker, A. A. Mayorov, J. H. Christenson, M. Strovink, David H. Adams, Alice Bean, Y. Fisyak, Marvin Johnson, A. V. Kozelov, B. Pawlik, D. Casey, J. Kotcher, N. Graf, H. D. Wahl, M. Zanabria, Winston Ko, T. Yasuda, C. Klopfenstein, B. Knuteson, X. F. Song, N. Sotnikova, J. V.D. Wirjawan, R. J. Genik, Wendy Taylor, A. Patwa, Allan G Clark, P. Gartung, Stephen Wimpenny, T. Marshall, Darien Wood, E. Kajfasz, Nicholas John Hadley, S. Blessing, Scott Snyder, R. Markeloff, R. K. Shivpuri, P. van Gemmeren, Kaushik De, V. Oguri, Gustaaf Brooijmans, S. P. Denisov, J. Warchol, M. R. Krishnaswamy, B. Gibbard, A. Para, Elizabeth Gallas, J. Sculli, Sergey Chekulaev, Nikos Varelas, P. Rubinov, K. A. Johns, K. W. Merritt, J. F. Bartlett, V. Manankov, L. Lueking, Howard Gordon, V. Akimov, K. C. Frame
Rok vydání: 2000
Předmět:
Zdroj: Physical Review Letters. 85:256-261
ISSN: 1079-7114
0031-9007
DOI: 10.1103/physrevlett.85.256
Popis: The D0 collaboration has performed a study of spin correlation in tt-bar production for the process tt-bar to bb-bar W^+W^-, where the W bosons decay to e-nu or mu-nu. A sample of six events was collected during an exposure of the D0 detector to an integrated luminosity of approximately 125 pb^-1 of sqrt{s}=1.8 TeV pp-bar collisions. The standard model (SM) predicts that the short lifetime of the top quark ensures the transmission of any spin information at production to the tt-bar decay products. The degree of spin correlation is characterized by a correlation coefficient k. We find that k>-0.25 at the 68% confidence level, in agreement with the SM prediction of k=0.88.
Databáze: OpenAIRE