نتایج جستجو برای: boson
تعداد نتایج: 15420 فیلتر نتایج به سال:
The existence of a new massive charged gauge boson, known as W’, is proposed by many new physics scenarios. When W’ decays to tb, the final state is very similar to the final state of the s-channel single top production, where W boson is the off-shell mediator to produce the top and bottom quarks. If W’ exists, it can affect the cross section of the SM s-channel single top production, so measur...
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One of the most interesting properties of boson gases is that under special conditions, there is a possibility of a phase transition, in a critical temperature below which all bosons condensate into the ground state. This phenomenon is called Bose – Einstein Condensation (BEC). In this paper, we investigate BEC in a harmonic oscillator trap. We conclude that, in contrast to a free boson ga...
We consider the Lorentz violating extension of the standard model introduced by D. Colladay and V. A. Kostelecky. In this framework, we obtain all Feynman rules for the electroweak part of the standard model extension (SME), for the first time. Among the new obtained interactions one finds new vertices for the Higgs boson that is interesting in the phenomenology of the Higgs particle.
In this paper, we examine the singlet scalar dark matter annihilation to becoming the Standard Model particles in the non-commutative space. In the recent decades, many candidates of dark matter have been offered, but our information about the nature of dark matter is still limited. There are such particle candidates as scalar matetr, fermion, boson, gauge boson, etc.; however, they have nei...
This paper shortly reports on the results of Higgs boson searches performed at LEP and Tevatron. No signal is found and limits on the mass and couplings of the Higgs boson are derived. Interpreting the data in the framework of the Standard Model, the 95% C.L. lower limit of 114.4 GeV on the Higgs boson mass is obtained.
We calculate the rates for lepton number violating processes via the exchange of the Z ′ boson occuring in top-color assisted technicolor. We found that μ-e conversion in nuclei is about an order of magnitude better than μ → 3e for constraining the magnitudes of the lepton mixing angles. The decay μ → eγ yields much weaker bounds. The current experimental limits allow for a mass of the new gaug...
A search has been performed for the Standard Model Higgs boson in the data collected with the ALEPH detector in 2000. An excess of 3σ above the background expectation is found. The observed excess is consistent with the production of the Higgs boson with a mass close to 114 GeV/c 2 .
This article reports three analyses of W and Z boson properties from the DØ experiment at the Fermilab Tevatron. The W boson mass measurement using 1 f b −1 DØ data is presented. This measurement reaches a 43 MeV precision on the W boson mass, which is currently the most precise result from a single experiment. It is used to place indirect constraint on the mass of the hypothetical Higgs boson....
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