95 research outputs found

### Fermionic decays of scalar leptoquarks and scalar gluons in the minimal four color symmetry model

Fermionic decays of the scalar leptoquarks $S=S_1^{(+)}, S_1^{(-)}, S_m$
and of the scalar gluons $F=F_1, F_2$ 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 $S_1^{(+)}\to tl^+_j, S_1^{(-)}\to
\nu_i\tilde b, S_m\to t\tilde \nu_j, F_1\to t\tilde b, F_2\to t\tilde t$ are
dominant with the widths of order of a few GeV for $m_S, m_F<1$ TeV and with
the total branching ratios close to 1. In the case of $m_S < m_t$ 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
$Br(S_1^{(+)}\to cl^+) \approx$ $Br(S_1^{(-)}\to \nu\tilde b) \approx 1$,
$Br(S_m\to bl^+) \approx 0.9$ and $Br(S_m\to c\tilde \nu) \approx 0.1.$ 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

### Chiral color symmetry and possible $G'$-boson effects at the Tevatron and LHC

A gauge model with chiral color symmetry is considered and possible effects
of the color $G'$-boson octet predicted by this symmetry are investigated in
dependence on two free parameters, the mixing angle $\theta_G$ and $G'$ mass
$m_{G'}$. The allowed region in the $m_{G'} - \theta_G$ plane is found from the
Tevatron data on the cross section $\sigma_{t\bar{t}}$ and forward-backward
asymmetry $A_{\rm FB}^{p \bar p}$ of the $t\bar{t}$ production. The mass limits
for the $G'$-boson are shown to be stronger than those for the axigluon. A
possible effect of the $G'$-boson on the $t\bar{t}$ production at the LHC is
discussed and the mass limits providing for the $G'$-boson evidence at the LHC
are estimated in dependence on $\theta_G$.Comment: 11 pages, 2 figures, accepted for publication in Modern Physics
Letters

### Colored scalar particles production in $pp$-collisions and possible mass limits for scalar gluons from future LHC data

Cross sections of the colored scalar particle production in $pp$-collisions
are calculated and differential and total cross sections of the corresponding
parton subprocesses are obtained. The total cross section of scalar gluon
production in $pp$-collisions at the LHC is estimated and the dominant decays
of scalar gluons are discussed. The production cross section of scalar gluons
$F$ with masses $m_F\lesssim 1300$ GeV is shown to be sufficient for the
effective production of these particles at the LHC.Comment: 10 pages, 3 figures, to be published in Mod. Phys. Lett.

### The research of qualitative indicators of gas pipelines during the operation

The operation of gas pipelines is a complex of technical measures, aimed at preservation of the main stock of gas pipeline transportation facilities. The purpose of these measures is to maintain and to restore the initial operational capabilities of gas pipelines, in general and in particular areas. The line section of gas pipelines has the largest size and cost. Naturally determined process of changing the quality of gas pipelines during the operation is accompanied by the accumulation and development of damages, failures; this determines the objective need to restore the quality of operation. The practical running of the line section of gas pipelines is characterized by a certain flow of failures; therefore it is necessary to ensure the required level of reliability of the gas pipeline during the entire period of operation. The quality control study of the inter-settlement gas pipeline section was conducted, and graphs of dependence of gas pipeline quality parameters on time were presented in the work.Keywords: line section of the gas pipeline, technological state, failures in operation, gas pipeline operation, control and quality parameters of the gas pipeline

### Modes of magnetic resonance in the spin liquid phase of Cs2CuCl4

We report the observation of a frequency shift and splitting of the electron
spin resonance (ESR) mode of the low-dimensional S=1/2 frustrated
antiferromagnet Cs2CuCl4 in the spin-correlated state below the Curie-Weiss
temperature 4 K but above the ordering temperature 0.62 K. The shift and
splitting exhibit strong anisotropy with respect to the direction of the
applied magnetic field and do not vanish in zero field. The low-temperature
evolution of spin resonance response is a result of the specific modification
of one-dimensional spinon continuum under the action of the uniform
Dzyaloshinskii-Moriya interaction (DM) within the spin chains. Parameters of
the uniform DM interaction are derived from the experiment.Comment: 10 pages, 12 figure

- â€¦