4,124 research outputs found

### Unparticle as a field with continuously distributed mass

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 $SU_c(3)\otimes SU_L(2)\otimes U(1)$
Standard Model is the extension with the replacement of the U(1) gauge
propagator $\frac{1}{k^2} \to \frac{1}{k^2} + \int
_0^{\infty}\frac{\rho(t)}{-t+k^2 +i\epsilon}dt$ with $\int_0^{\infty}\rho(t)dt
< \infty$.Comment: 6 pages, added references, corrected typo

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

We investigate a model of $SU(2) \otimes U(1)$ 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
$\frac{1}{N+1}$, 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 $SU(2) \otimes U(1)$
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

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

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

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