17 research outputs found
Low scale B-L extension of the Standard Model at the LHC
The fact that neutrinos are massive indicates that the Standard Model (SM)
requires extension. We propose a low energy (<TeV) B-L extension of the SM,
which is based on the gauge group SU(3)_C x SU(2)_L x U(1)_Y x U(1)_{B-L}. We
show that this model provides a natural explanation for the presence of three
right-handed neutrinos in addition to an extra gauge boson and a new scalar
Higgs. Therefore, it can lead to very interesting phenomenological implications
different from the SM results which can be tested at the LHC. Also we analyze
the muon anomalous magnetic moment in this class of models. We show that
one-loop with exchange Z' may give dominant new contribution ~ few x 10^{-11}.Comment: 12 page
Muon Anomalous Magnetic Moment and mu -> e gamma in B-L Model with Inverse Seesaw
We study the anomalous magnetic moment of the muon, a_\mu, and lepton flavor
violating decay \mu -> e \gamma in TeV scale B-L extension of the Standard
Model (SM) with inverse seesaw mechanism. We show that the B-L contributions to
a_\mu are severely constrained, therefore the SM contribution remains intact.
We also emphasize that the current experimental limit of BR(\mu -> e \gamma)
can be satisfied for a wide range of parameter space and it can be within the
reach of MEG experiment.Comment: 10 pages, 4 Figure
TeV Scale Leptogenesis in B-L Model with Alternative Cosmologies
In TeV scale B-L extension of the standard model with inverse seesaw, the
Yukawa coupling of right-handed neutrinos can be of order one. This implies
that the out of equilibrium condition for leptogenesis within standard
cosmology is not satisfied. We provide two scenarios for overcoming this
problem and generating the desired value of the baryon asymmetry of the
Universe. The first scenario is based on extra-dimensional braneworld effects
that modify the Friedman equation. We show that in this case the value of the
baryon asymmetry of the Universe constrains the five-dimensional Planck mass to
be of order O(100) TeV. In the second scenario a non-thermal right-handed
neutrino produced by the decay of inflaton is assumed. We emphasize that in
this case, it is possible to generate the required baryon asymmetry of the
Universe for TeV scale right-handed neutrinos.Comment: 13 pages, 2 figure
Right-handed Sneutrino Dark Matter in Supersymmetric B-L Model
We show that the lightest right-handed sneutrino in TeV scale supersymmetric
B-L model with inverse seesaw mechanism is a viable candidate for cold dark
matter. We find that it accounts for the observed dark matter relic abundance
in a wide range of parameter space. The spin-independent cross section of B-L
right-handed sneutrino is consistent with the recent results CDMS II and XENON
experiments and it is detectable in future direct detection experiments.
Although the B-L right-handed sneutrinos annihilate into leptons, the PAMELA
results can not be explained in this model unless a huge boost factor is
considered. Also the muon flux generated by B-L right-handed sneutrino in the
galactic center is smaller than Super-Kamiokande's upper bound.Comment: 16 pages, 7 figures; version accepted for publication in Journal of
High Energy Physic
Cotton in the new millennium: advances, economics, perceptions and problems
Cotton is the most significant natural fibre and has been a preferred choice of the textile industry and consumers since the industrial revolution began. The share of man-made fibres, both regenerated and synthetic fibres, has grown considerably in recent times but cotton production has also been on the rise and accounts for about half of the fibres used for apparel and textile goods. To cotton’s advantage, the premium attached to the presence of cotton fibre and the general positive consumer perception is well established, however, compared to commodity man-made fibres and high performance fibres, cotton has limitations in terms of its mechanical properties but can help to overcome moisture management issues that arise with performance apparel during active wear.
This issue of Textile Progress aims to:
i. Report on advances in cotton cultivation and processing as well as improvements to conventional cotton cultivation and ginning. The processing of cotton in the textile industry from fibre to finished fabric, cotton and its blends, and their applications in technical textiles are also covered.
ii. Explore the economic impact of cotton in different parts of the world including an overview of global cotton trade.
iii. Examine the environmental perception of cotton fibre and efforts in organic and genetically-modified (GM) cotton production. The topic of naturally-coloured cotton, post-consumer waste is covered and the environmental impacts of cotton cultivation and processing are discussed. Hazardous effects of cultivation, such as the extensive use of pesticides, insecticides and irrigation with fresh water, and consequences of the use of GM cotton and cotton fibres in general on the climate are summarised and the effects of cotton processing on workers are addressed. The potential hazards during cotton cultivation, processing and use are also included.
iv. Examine how the properties of cotton textiles can be enhanced, for example, by improving wrinkle recovery and reducing the flammability of cotton fibre
Z ` discovery potential at the LHC in the minimal B-L extension of the standard model
We present the Large Hadron Collider (LHC) discovery potential in the
sector of a enlarged Standard Model (that also includes three
heavy Majorana neutrinos and an additional Higgs boson) for , 10
and 14 TeV centre-of-mass (CM) energies, considering both the
and decay
channels. The comparison of the (irreducible) backgrounds with the expected
backgrounds for the D\O experiment at the Tevatron validates our simulation.
We propose an alternative analysis that has the potential to improve the D\O
sensitivity. Electrons provide a higher sensitivity to smaller couplings at
small boson masses than do muons. The resolutions achievable may
allow the boson width to be measured at smaller masses in the case
of electrons in the final state. The run of the LHC at TeV,
assuming at most fb, will be able to give
similar results to those that will be available soon at the Tevatron in the
lower mass region, and to extend them for a heavier .Comment: 33 Pages, 14 figures and 8 tables. Updated Tevatron bounds and
comparison to CDF and D0; improved methodology explanation; commented on
inclusion of detector effects. Results changed only for the comparison to
Tevatron. Corrected typos and updated bibliography to match published version
in EPJ