نتایج جستجو برای: intermediumte boson mass
تعداد نتایج: 487081 فیلتر نتایج به سال:
The two-loop electroweak bosonic correction to the muon lifetime and the M W –M Z interdependence is computed using analytical methods of asymptotic expansion. Combined with previous calculations this completes the full two-loop correction to ∆r in the Standard Model. The shift to the prediction of W-boson mass due to two-loop bosonic corrections does not exceed 1 MeV for the range of the Higgs...
We explore corrections to electroweak parameters in the context of Extended Technicolor (ETC) models in which the ETC gauge-boson which generates the top-quark mass carries weak SU(2) charge. For mt ∼ 150 GeV there exist potentially large corrections to the Z decay width to b-quarks. Interestingly, in contrast to the situation in ETC models where the gauge-boson which generates the top-quark ma...
By exploiting the full process pp̄ → tb̄H, in place of the standard Monte Carlo procedure of factorising production and decay, pp̄ → tt̄ followed by t̄ → b̄H, we show how to improve the discovery reach of the Tevatron (Run 2) in charged Higgs boson searches, in the large tan β region. This is achieved in conjunction with dedicated cuts on a ‘transverse mass’ distribution sensitive to the Higgs boson ...
A Higgs boson within the mass range M H = 140 − 190 GeV can be discovered at a photon collider in the reaction γγ → W W (with real or virtual W) with the luminosity integral about 1 fb −1. The reasonable resolution in the effective mass of the W W system is required. A discovery of the Higgs boson is one of the main goals for the next generation of colliders.
We clarify a mechanism to obtain a massless gauge boson from the KaluzaKlein approach of the Randall-Sundrum(RS) brane world. This corresponds exactly to the same mechanism of achieving a localization of the gauge boson by adding both the bulk and brane mass terms. Accordingly this work puts another example for a localization-mechanism of the gauge boson on the brane. E-mail address: ysmyung@ph...
We combine searches by the CDF and D0 Collaborations for a Higgs boson decaying to W+W-. The data correspond to an integrated total luminosity of 4.8 (CDF) and 5.4 (D0) fb(-1) of pp collisions at square root(s) = 1.96 TeV at the Fermilab Tevatron collider. No excess is observed above background expectation, and resulting limits on Higgs boson production exclude a standard model Higgs boson in t...
The mass and the decay width of a Higgs boson in the minimal standard model are evaluated by a variational method in the limit of strong self-coupling interaction. The non-perturbative technique provides an interpolation scheme between strong-coupling regime and weak-coupling limit where the standard perturbative results are recovered. In the strong-coupling limit the physical mass and the deca...
This week, the Large Hadron Collider at CERN announced the discovery of a new boson with mass of ~125 GeV. Many have interpreted these results as evidence in favor of the Higgs boson believed to provide a mechanism for subatomic particle mass generation. However, CERN stated in their announcement that the true identity of the new boson, if confirmed, has yet to be determined. In this article, I...
We report a selection of the most recent CDF and D0 results on top quark and W and Z boson properties, based on Tevatron Run 2 data. The large datasets of W and Z bosons allow a very precise measurement of the W mass and detailed studies of vector boson production and asymmetries. Associated production of vector boson pairs has been observed and cross sections have been measured. The top quark ...
In supersymmetric models with minimal particle content and without left-right squark mixing, the conventional wisdom is that the 125.6 GeV Higgs boson mass implies top squark masses of O(10) TeV, far beyond the reach of colliders. This conclusion is subject to significant theoretical uncertainties, however, and we provide evidence that it may be far too pessimistic. We evaluate the Higgs boson...
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