Helicity of the W boson in lepton + jets tt̄ events

V. M. Abazov, B. Abbott, A. Abdesselam, M. Abolins, V. Abramov, B. S. Acharya, D. L. Adams, M. Adams, S. N. Ahmed, G. D. Alexeev, A. Alton, G. A. Alves, Y. Arnoud, C. Avila, V. V. Babintsev, L. Babukhadia, T. C. Bacon, A. Baden, S. Baffioni, B. BaldinP. W. Balm, S. Banerjee, E. Barberis, P. Baringer, J. Barreto, J. F. Bartlett, U. Bassler, D. Bauer, A. Bean, F. Beaudette, M. Begel, A. Belyaev, S. B. Beri, G. Bernardi, I. Bertram, A. Besson, R. Beuselinck, V. A. Bezzubov, P. C. Bhat, V. Bhatnagar, M. Bhattacharjee, G. Blazey, F. Blekman, S. Blessing, A. Boehnlein, N. I. Bojko, T. A. Bolton, F. Borcherding, K. Bos, T. Bose, A. Brandt, G. Briskin, R. Brock, G. Brooijmans, A. Bross, D. Buchholz, M. Buehler, V. Buescher, V. S. Burtovoi, J. M. Butler, F. Canelli, W. Carvalho, D. Casey, H. Castilla-Valdez, D. Chakraborty, K. M. Chan, S. V. Chekulaev, D. K. Cho, S. Choi, S. Chopra, D. Claes, A. R. Clark, B. Connolly, W. E. Cooper, D. Coppage, S. Crépé-Renaudin, M. A C Cummings, D. Cutts, H. Da Motta, G. A. Davis, K. De, S. J. De Jong, M. Demarteau, R. Demina, P. Demine, D. Denisov, S. P. Denisov, S. Desai, H. T. Diehl, M. Diesburg, S. Doulas, L. V. Dudko, L. Duflot, S. R. Dugad, A. Duperrin, A. Dyshkant, D. Edmunds, J. Ellison, J. T. Eltzroth, V. D. Elvira, R. Engelmann, S. Eno, P. Ermolov, O. V. Eroshin, J. Estrada, H. Evans, V. N. Evdokimov, T. Ferbel, F. Filthaut, H. E. Fisk, M. Fortner, H. Fox, S. Fu, S. Fuess, E. Gallas, A. N. Galyaev, M. Gao, V. Gavrilov, K. Genser, C. E. Gerber, Y. Gershtein, G. Ginther, B. Gómez, P. I. Goncharov, K. Gounder, A. Goussiou, P. D. Grannis, H. Greenlee, Z. D. Greenwood, S. Grinstein, L. Groer, S. Grünendahl, S. N. Gurzhiev, G. Gutierrez, P. Gutierrez, N. J. Hadley, H. Haggerty, S. Hagopian, V. Hagopian, R. E. Hall, C. Han, S. Hansen, J. M. Hauptman, C. Hebert, D. Hedin, J. M. Heinmiller, A. P. Heinson, U. Heintz, M. D. Hildreth, R. Hirosky, J. D. Hobbs, B. Hoeneisen, J. Huang, Y. Huang, I. Iashvili, R. Illingworth, A. S. Ito, M. Jaffré, S. Jain, V. Jain, R. Jesik, K. Johns, M. Johnson, A. Jonckheere, H. Jöstlein, A. Juste, W. Kahl, S. Kahn, E. Kajfasz, A. M. Kalinin, D. Karmanov, D. Karmgard, R. Kehoe, S. Kesisoglou, A. Khanov, A. Kharchilava, B. Klima, J. M. Kohli, A. V. Kostritskiy, J. Kotcher, B. Kothari, A. V. Kozelov, E. A. Kozlovsky, J. Krane, M. R. Krishnaswamy, P. Krivkova, S. Krzywdzinski, M. Kubantsev, S. Kuleshov, Y. Kulik, S. Kunori, A. Kupco, V. E. Kuznetsov, G. Landsberg, W. M. Lee, A. Leflat, F. Lehner, C. Leonidopoulos, J. Li, Q. Z. Li, J. G R Lima, D. Lincoln, S. L. Linn, J. Linnemann, R. Lipton, L. Lueking, C. Lundstedt, C. Luo, A. K A MacIel, R. J. Madaras, V. L. Malyshev, V. Manankov, H. S. Mao, T. Marshall, M. I. Martin, S. E K Mattingly, A. A. Mayorov, R. McCarthy, T. McMahon, H. L. Melanson, A. Melnitchouk, M. Merkin, K. W. Merritt, C. Miao, H. Miettinen, D. Mihalcea, N. Mokhov, N. K. Mondal, H. E. Montgomery, R. W. Moore, Y. D. Mutaf, E. Nagy, M. Narain, V. S. Narasimham, N. A. Naumann, H. A. Neal, J. P. Negret, S. Nelson, A. Nomerotski, T. Nunnemann, D. O'Neil, V. Oguri, N. Oshima, P. Padley, N. Parashar, R. Partridge, N. Parua, A. Patwa, O. Peters, P. Pétroff, R. Piegaia, B. G. Pope, H. B. Prosper, S. Protopopescu, M. B. Przybycien, J. Qian, A. Quadt, S. Rajagopalan, P. A. Rapidis, N. W. Reay, S. Reucroft, M. Ridel, M. Rijssenbeek, F. Rizatdinova, T. Rockwell, C. Royon, P. Rubinov, R. Ruchti, B. M. Sabirov, G. Sajot, A. Santoro, L. Sawyer, R. D. Schamberger, H. Schellman, A. Schwartzman, E. Shabalina, R. K. Shivpuri, D. Shpakov, M. Shupe, R. A. Sidwell, V. Simak, V. Sirotenko, P. Slattery, R. P. Smith, G. R. Snow, J. Snow, S. Snyder, J. Solomon, Y. Song, V. Sorín, M. Sosebee, N. Sotnikova, K. Soustruznik, M. Souza, N. R. Stanton, G. Steinbrück, D. Stoker, V. Stolin, A. Stone, D. A. Stoyanova, M. A. Strang, M. Strauss, M. Strovink, L. Stutte, A. Sznajder, M. Talby, W. Taylor, S. Tentindo-Repond, T. G. Trippe, A. S. Turcot, P. M. Tuts, R. Van Kooten, V. Vaniev, N. Varelas, F. Villeneuve-Seguier, A. A. Volkov, A. P. Vorobiev, H. D. Wahl, Z. M. Wang, J. Warchol, G. Watts, M. Wayne, H. Weerts, A. White, D. Whiteson, D. A. Wijngaarden, S. Willis, S. J. Wimpenny, J. Womersley, D. R. Wood, Q. Xu, R. Yamada, T. Yasuda, Y. A. Yatsunenko, K. Yip, J. Yu, M. Zanabria, X. Zhang, B. Zhou, Z. Zhou, M. Zielinski, D. Zieminska, A. Zieminski, V. Zutshi, E. G. Zverev, A. Zylberstejn

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Abstract

We examine properties of tt̄ candidate events in lepton + jets final states to establish the helicities of W bosons in t→W+b decays. Our analysis is based on a direct calculation of a probability density for each event to correspond to a tt̄ final state, as a function of the helicity of the W boson. Using the 125 events/pb of data collected by the DØ experiment at the Fermilab Tevatron pp̄ Collider at s=1.8 TeV, we obtain a longitudinal helicity fraction F0=0.56±0.31, consistent with the prediction of F0=0.70 from the standard model.

Original languageEnglish (US)
Pages (from-to)1-10
Number of pages10
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume617
Issue number1-2
DOIs
StatePublished - Jun 23 2005

Bibliographical note

Funding Information:
We thank the staffs at Fermilab and collaborating institutions, and acknowledge support from the Department of Energy and National Science Foundation (USA), Commissariat à l'Energie Atomique and CNRS/Institut National de Physique Nucléaire et de Physique des Particules (France), Ministry of Education and Science, Agency for Atomic Energy and RF President Grants Program (Russia), CAPES, CNPq, FAPERJ, FAPESP and FUNDUNESP (Brazil), Departments of Atomic Energy and Science and Technology (India), Colciencias (Colombia), CONACyT (Mexico), Ministry of Education and KOSEF (Korea), CONICET and UBACyT (Argentina), The Foundation for Fundamental Research on Matter (The Netherlands), PPARC (United Kingdom), Ministry of Education (Czech Republic), A.P. Sloan Foundation, and the Research Corporation. We also wish to thank Dr. Igor Volobouev for pointing out an error in our initial phase space calculation.

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