Direct Search For Heavy Neutral Gauge Bosons In The Dielectron Channel At
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Total Pages | : 176 |
Release | : 2008 |
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The existence of a heavy partner of the Z boson, a so-called Z' boson, is proposed in many extensions of the Standard Model, including grand unified theories, extended tecnhicolor models, and models with extra dimensions. This dissertation describes a direct search in the di-electron invariant mass spectrum for evidence of Z' production. The analysis used 1.106 ± 0.067 fb-1 of data collected from 2002 to 2006 with the D0 detector, which studies p$\bar{p}$ interactions at a center-of-mass energy of p s = 1.96TeV. In the absence of a Z' signal, a 95% upper limit on the production cross section is set for a Z' decaying into dielectrons. The existence of a Z0 with mass less than 920 GeV is excluded at the 95% confidence level, assuming the sequential Z' model. This result represents a significant improvement over the most stringent published limit from a direct search to date, namely 850 GeV.
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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.
Author | : Mingcheng Gao |
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Total Pages | : 314 |
Release | : 2003 |
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Total Pages | : 50 |
Release | : 1903 |
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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 | : Steven M. Glenn |
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Total Pages | : 444 |
Release | : 1996 |
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Author | : Yan-Jie Schnellbach |
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Release | : 2014 |
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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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Release | : 2010 |
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This contribution reports on some of the most recent searches for new heavy neutral bosons and leptoquarks performed at the Tevatron experiments.