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| Release | : 2001 |
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A search for a neutral heavy vector gauge boson, [ital Z]', was conducted in[ital p[anti p]] collisions using 110 pb[sup -1] of data obtained at the Collider Detector at Fermilab. We present preliminary 95% CL limits on the production of[ital Z]' in different models using its[ital e][sup+][ital e][sup -] and[mu][sup+][mu][sup -] decay modes.
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| Total Pages | : 19 |
| Release | : 2011 |
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The ATLAS detector at the LHC is used to search for heavy charged gauge bosons (W'), decaying to a charged lepton (electron or muon) and a neutrino. Results are presented based on the analysis of pp collisions at a center-of-mass energy of 7 TeV corresponding to an integrated luminosity of 1.04 fb−1. No excess beyond Standard Model expectations is observed. A W' with Sequential Standard Model couplings is excluded at the 95% confidence level for masses up to 2.15 TeV.
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| Total Pages | : 8 |
| Release | : 2010 |
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We report the results of a search for a heavy neutral gauge boson Z' decaying into the dielectron final state using data corresponding to an integrated luminosity of 5.4 fb−1 collected by the D0 experiment at the Fermilab Tevatron Collider. No significant excess above the standard model prediction is observed in the dielectron invariant-mass spectrum. We set 95% C.L. upper limits on [sigma](p{bar p} → Z') x BR(Z' → ee) depending on the dielectron invariant mass. These cross section limits are used to determine lower mass limits for Z' bosons in a variety of models with standard model couplings and variable strength.
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| Total Pages | : 28 |
| Release | : 2011 |
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The ATLAS detector at the LHC is used to search for heavy charged gauge bosons (W'), decaying to a charged lepton (electron or muon) and a neutrino. Results are presented based on the analysis of pp collisions at a center-of-mass energy of 7 TeV corresponding to an integrated luminosity of 1.04 fb−1. No excess beyond Standard Model expectations is observed. A W' with Sequential Standard Model couplings is excluded at the 95% confidence level for masses up to 2.15 TeV.
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| Release | : 2012 |
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The ATLAS detector at the LHC is used to search for high-mass states, such as heavy charged gauge bosons (W'), decaying to a charged lepton (electron or muon) and a neutrino. Results are presented based on the analysis of pp collisions at a centre-of-mass energy of 7 TeV corresponding to an integrated luminosity of 4.7 fb-1. No excess beyond Standard Model expectations is observed. A W' with Sequential Standard Model couplings is excluded at the 95% credibility level for masses up to 2.55 TeV. Excited chiral bosons (W*) with equivalent coupling strength are excluded for masses up to 2.42 TeV.
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| Total Pages | : 9 |
| Release | : 1994 |
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We have searched for the production of a heavy neutral gauge boson (????????) decaying into dielectrons in {bar p}p collisions at √s = 1.8 TeV. The data are obtained using the CDF detector during 1992--1993 run, and correspond to an integrated luminosity of 19.6 ± 0.7 pb-1. We present a 95% confidence level upper limit on the production cross section times branching ratio of???????? decaying into dielectrons as a function of???????? mass. We also present lower mass limits for???????? bosons using standard model coupling strengths, the predictions of several E6 models, and the Alternative Left-Right model.
| Author | : Carlos Felipe González Hernández |
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| Release | : 2018 |
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New heavy neutral gauge bosons, generically referred as Z0 bosons, are predicted in several theoretical scenarios beyond the standard model (BSM). In these kinds of scenarios, the breaking of extended symmetry usually results in an extra U(1)' symmetry group. This additional symmetry would give rise to the existence of a Z' boson with a mass that should be in the TeV scale. There are some scenarios that predict a generational coupling dependence, where the Z' boson would decay preferentially to the third generation of fermions, for instance, the topcolor-assisted technicolor (TAT) models. These scenarios are a motivation to search for Z' bosons decaying into tau pairs. The search for Z' decaying into tau-pairs involves four experimental signatures since the tau lepton can decay leptonically or hadronically. The dihadronic tau channel has the best sensitivity since it has the highest expected signal yield, but it has a high background contribution coming...
