4,124 research outputs found

    Unparticle as a field with continuously distributed mass

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    We point out that the notion of an unparticle, recently introduced by Georgi, can be interpreted as a particular case of a field with continuously distributed mass considered in ref.\cite{14}. We also point out that the simplest renormalizable extension of the SUc(3)SUL(2)U(1)SU_c(3)\otimes SU_L(2)\otimes U(1) Standard Model is the extension with the replacement of the U(1) gauge propagator 1k21k2+0ρ(t)t+k2+iϵdt\frac{1}{k^2} \to \frac{1}{k^2} + \int _0^{\infty}\frac{\rho(t)}{-t+k^2 +i\epsilon}dt with 0ρ(t)dt<\int_0^{\infty}\rho(t)dt < \infty .Comment: 6 pages, added references, corrected typo

    Influence of SU(2)U(1)SU(2) \otimes U(1) singlet scalars on Higgs boson signal at LHC

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    We investigate a model of SU(2)U(1)SU(2) \otimes U(1) singlet scalars coupled to Standard Model. We point out that for the case of maximal mixing between singlet scalars and standard Higgs boson the Higgs boson production cross section is smaller than the standard Higgs boson production by factor 1N+1\frac{1}{N+1}, where N is the number of singlet scalar scalars. For the case of big mixing Higgs boson could be nonobservable at LHC. However, there is also a possibility for the observation of scalar singlets at LHC. As a quasirealistic example we discuss a supersymmetric SU(2)U(1)SU(2) \otimes U(1) electroweak model with an additional gauge singlet chiral superfield.Comment: 9 pages, latex, no figure

    The search for new physics by the measurement of the 4-jet cross section at LHC and FNAL

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    We investigate the possibility to look for new physics by the measurement of the 4-jet cross section at LHC and FNAL. In particular, we consider the model with scalar colour octet and the supersymmetric model with R-parity violation. In both models pair produced new particles decay into 2 jets thus leading to 4-jet events. Therefore, the measurement of the distributions of 4-jet differential cross section on the invariant dijet masses allows to look for new physics. The main background comes from standard QCD 4-jet events. We find that at LHC it would be possible to discover scalar colour particles with masses up to 900 Gev and for FNAL the corresponding bound is 175 Gev.Comment: 14 pages, late

    Search for Standard Higgs Boson at Supercolliders

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    We review the standard Higgs boson physics and the search for higgs boson at LEP and LHC supercollidersComment: latex, 70 pages, 15 ps.figure