366 research outputs found
Fermionic decays of scalar leptoquarks and scalar gluons in the minimal four color symmetry model
Fermionic decays of the scalar leptoquarks
and of the scalar gluons predicted by the four color symmetry
model with the Higgs mechanism of the quark-lepton mass splitting are
investigated. Widths and branching ratios of these decays are calculated and
analysed in dependence on coupling constants and on masses of the decaying
particles. It is shown that the decays are
dominant with the widths of order of a few GeV for TeV and with
the total branching ratios close to 1. In the case of the dominant
scalar leptoquark decays are S_1^{(+)}\to cl_j^+, S_1^{(-)}\to \nu_i\tilde b,
S_m\to b\l_j^+, S_m\to c\tilde \nu_j with the total branching ratios
,
and A
search for such decays at the LHC and Tevatron may be of interest.Comment: 11 pages, 1 figure, 1 table, to be published in Modern Physics
Letters
Color Octet Scalar Bound States at the LHC
One possible extension of the Standard Model scalar sector includes SU(2)_L
doublet scalars that are color octets rather than singlets. We focus on models
in which the couplings to fermions are consistent with the principle of minimal
flavor violation (MFV), in which case these color octet scalars couple most
strongly to the third generation of quarks. When the Yukawa coupling of color
octet scalars to Standard Model fermions is less than unity, these states can
live long enough to bind into color-singlet spin-0 hadrons, which we call
octetonia. In this paper, we consider the phenomenology of octetonia at the
Large Hadron Collider (LHC). Predictions for their production via gluon-gluon
fusion and their two-body decays into Standard Model gauge bosons, Higgs
bosons, and \bar{t}t are presented.Comment: 13 pages, 5 figures, published versio
Bounds on scalar leptoquark and scalar gluon masses from S, T, U in the minimal four color symmetry model
The contributions into radiative correction parameters S, T, U from scalar
leptoquark and scalar gluon doublets are investigated in the minimal four color
symmetry model. It is shown that the current experimental data on S, T, U allow
the scalar leptoquarks and the scalar gluons to be relatively light (with
masses of order of 1 TeV or less), the lightest particles are preferred to lie
below 400 GeV. In particular, the lightest scalar leptoquarks with masses below
300 GeV are shown to be compatible with the current data on S, T, U at for in comparison with
in the Standard Model. The lightest scalar gluon in this case is expected to
lie below 850 (720) GeV. The possible significance of such particles in the
t-quark physics at LHC is emphasized.Comment: 14 pages, 2 figures, to appear in Physics Letters
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