A Search For Right Handed Dw Bosons In Bar Pp Collisions With The D0 Detector At Fermilab
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Search for W-prime Boson Resonances Decaying to a Top Quark and a Bottom Quark
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| Total Pages | : 7 |
| Release | : 2008 |
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We search for the production of a heavy W(prime) gauge boson that decays to third generation quarks in 0.9 fb−1 of p{bar p} collisions at (square root)s = 1.96 TeV, collected with the D0 detector at the Fermilab Tevatron collider. We find no significant excess in the final-state invariant mass distribution and set upper limits on the production cross section times branching fraction. For a left-handed W(prime) boson with SM couplings, we set a lower mass limit of 731 GeV. For right-handed W(prime) bosons, we set lower mass limits of 739 GeV if the W(prime) boson decays to both leptons and quarks and 768 GeV if the W(prime) boson decays only to quarks. We also set limits on the coupling of the W(prime) boson to fermions as a function of its mass.
Search for W-prime Boson Production in the Top Quark Decay Channel
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| Total Pages | : 9 |
| Release | : 2006 |
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We present a search for the production of a new heavy gauge boson W' that decays to a top quark and a bottom quark. We have analyzed 230 pb−1 of data collected with the D0 detector at the Fermilab Tevatron collider at a center-of-mass energy of 1.96 TeV. No significant excess of events is found in any region of the final state invariant mass distribution. We set upper limits on the production cross section of W bosons at the 95% confidence level for several different W' boson masses. We exclude masses below 610 GeV for a W' boson with standard-model-like couplings, below 630 GeV for a W' boson with right-handed couplings that is allowed to decay to both leptons and quarks, and below 670 GeV for a W' boson with right-handed couplings that is only allowed to decay to quarks.
Combination of CDF and D0 Measurements of the $W$ Boson Helicity in Top Quark Decays
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| Total Pages | : 11 |
| Release | : 2012 |
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We report the combination of recent measurements of the helicity of the 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 p{bar p} collisions collected during Run II of the Fermilab Tevatron Collider. Combining measurements that simultaneously determine the fractions of W bosons with longitudinal (f0) and right-handed (f+) helicities, we 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 measurements 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 (syst.)] and f+ =?0.015 ± 0.035 [± 0.018 (stat.) ± 0.030 (syst.)]. The results are consistent with standard model expectations.
