Helicity of the W boson in lepton + jets $t\overline{t}$ events

V.M. Abazov B. Abbott A. Abdesselam 1 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 2 C. Avila V.V. Babintsev L. Babukhadia T.C. Bacon A. Baden S. Baffioni 3 B. Baldin P.W. Balm S. Banerjee E. Barberis P. Baringer J. Barreto J.F. Bartlett U. Bassler 4 D. Bauer A. Bean F. Beaudette 1 M. Begel A. Belyaev S.B. Beri G. Bernardi 4 I. Bertram A. Besson 2 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. Chana 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 2 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 1 S.R. Dugad A. Duperrin 3 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 Scott Hansen J.M. Hauptman Christian Hebert D. Hedin J.M. Heinmiller A.P. Heinson U. Heintz M.D. Hildreth R. Hirosky J.D. Hobbs B. Hoeneisen J. Huang Yue Huang I. Iashvili R. Illingworth A.S. Ito M. Jaffré 1 S. Jain V. Jain R. Jesik K. Johns M. Johnson A. Jonckheere H. Jöstlein A. Juste W. Kahl S. Kahn E. Kajfasz 3 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. Krivkov S. Krzywdzinski M. Kubantseva S. Kuleshov Y. Kulik S. Kunori A. Kupco V.E. Kuznetsov G. Landsberg W.M. Lee A. Leflat F. Lehner C. Leonidopoulos J. Lib 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 1 R. Piegai B.G. Pope H.B. Prosper S. Protopopescu M.B. Przybycien J. Qian A. Quadt S. Rajagopalan P.A. Rapidis N.W. Reaya S. Reucroft M. Ridel 1 M. Rijssenbeek F. Rizatdinova T. Rockwell C. Royon P. Rubinov R. Ruchti B.M. Sabirov G. Sajot 2 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. Sotnikov K. Soustruznik M. Souza N.R. Stanton G. Steinbrück D. Stoker V. Stolin A. Stone D.A. Stoyanov M.A. Strang M. Strauss M. Strovink L. Stutte A. Sznajder M. Talby 3 W. Taylor S. Tentindo-Repond T.G. Trippe A.S. Turcot P.M. Tuts R. van Kooten V. Vaniev N. Varelas F. Villeneuve-Seguier 3 A.A. Volkov A.P. Vorobiev H.D. Wahl Z.-M. Wang J. Warchol G. Wattsb M. Wayne H. Weerts A. Whiteb D. Whiteson D.A. Wijngaarden S. Willis S.J. Wimpenny J. Womersley D.R. Woods Q. Xu R. Yamada T. Yasuda Y.A. Yatsunenko K. Yip J. Yub M. Zanabri X. Zhangb B. Zhou Z. Zhou M. Zielinski D. Zieminska A. Zieminski V. Zutshi E.G. Zverev A. Zylberstejn
Abstract : We examine properties of $t\overline{t}$ candidate events in lepton + jets final states to establish the helicities of W bosons in $t\rightarrow$W+b$ decays. Our analysis is based on a direct calculation of a probability density for each event to correspond to a $t\overline{t}$ final state, as a function of the helicity of the $W$ boson. Using the 125 events/pb of data collected by the D0 experiment at the Fermilab Tevatron $p\overline{p}$ Collider at $\sqrt{s}$=1.8 TeV, we obtain a longitudinal helicity fraction $F_0$=0.56$\pm$0.31, consistent with the prediction of $F_0$=0.70 from the standard model.
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Submitted on : Thursday, June 2, 2005 - 4:32:34 PM
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V.M. Abazov, B. Abbott, A. Abdesselam, M. Abolins, V. Abramov, et al.. Helicity of the W boson in lepton + jets $t\overline{t}$ events. Physics Letters B, Elsevier, 2005, 617, pp.1-10. ⟨10.1016/j.physletb.2005.04.069⟩. ⟨in2p3-00024201⟩

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