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SUMMARY:Combination of CDF and D0 measurements of the W boson helicity in 
 top quark decays
DTSTART;VALUE=DATE-TIME:20120705T063000Z
DTEND;VALUE=DATE-TIME:20120705T064500Z
DTSTAMP;VALUE=DATE-TIME:20130521T072950Z
UID:indico-contribution-545@cern.ch
DESCRIPTION:Speakers: Prof. VARNES\, Erich Ward (University of Arizona (US
 ))\nWe report the combination of recent measurements of the helicity of th
 e W boson from top quark decay by the CDF and D0 collaborations\, based on
  data samples corresponding to integrated luminosities of 2.7 – 5.4 fb
 −1 of ppbar collisions collected during Run II of the Fermilab Tevatron 
 Collider. Combining measurements that simultaneously determine the fractio
 ns of W bosons with longitudinal (f0) and right-handed (f+) helicities\, w
 e find f0 = 0.722 ± 0.081 [± 0.062 (stat.) ± 0.052 (syst.)] and f+ = 
 −0.033 ± 0.046 [± 0.034 (stat.) ± 0.031 (syst.)]. Combining measureme
 nts where one of the helicity fractions is fixed to the value expected in 
 the standard model\, we find f0 = 0.682±0.057 [± 0.035 (stat.)±0.046 (s
 yst.)] and f+ = −0.015±0.035 [± 0.018 (stat.)±0.030 (syst.)]. The res
 ults are consistent with standard model expectations.\n\nhttp://indico.cer
 n.ch/contributionDisplay.py?contribId=545&sessionId=67&confId=181298
LOCATION:Melbourne Convention and Exhibition Centre Room 216
URL:http://indico.cern.ch/contributionDisplay.py?contribId=545&sessionId=6
 7&confId=181298
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