1,204 research outputs found
Higgs phenomenology of supersymmetric economical 3-3-1 model
We explore the Higgs sector in the supersymmetric economical 3-3-1 model and
find new features in this sector. The charged Higgs sector is revised i.e., in
difference of the previous work, the exact eigenvalues and states are obtained
without any approximation. In this model, there are three Higgs bosons having
masses equal to that of the gauge bosons--the W and extra X and Y. There is one
scalar boson with mass of 91.4 GeV, which is closed to the boson mass and
in good agreement with present limit: 89.8 GeV at 95% CL. The condition of
eliminating for charged scalar tachyon leads to splitting of VEV at the first
symmetry breaking, namely, . The interactions among the
standard model gauge bosons and scalar fields in the framework of the
supersymmetric economical 3-3-1 model are presented. From these couplings, at
some limit, almost scalar Higgs fields can be recognized in accordance with the
standard model. The hadronic cross section for production of the bilepton
charged Higgs boson at the CERN LHC in the effective vector boson approximation
is calculated. Numerical evaluation shows that the cross section can exceed
35.8 fb.Comment: 33 pages, 1 figur
Lepton masses in a supersymmetric 3-3-1 model
We consider the mass generation for both charginos and neutralinos in a 3-3-1
supersymmetric model. We show that R-parity breaking interactions leave the
electron and one of the neutrinos massless at the tree level. However the same
interactions induce masses for these particles at the 1-loop level. Unlike the
similar situation in the MSSM the masses of the neutralinos are related to the
masses of the charginos.Comment: RevTex, 11 pages incluing 2 .eps figures. Extended published versio
The High-Mass End of the Red Sequence at z~0.55 from SDSS-III/BOSS: completeness, bimodality and luminosity function
We have developed an analytical method based on forward-modeling techniques
to characterize the high-mass end of the red sequence (RS) galaxy population at
redshift , from the DR10 BOSS CMASS spectroscopic sample, which
comprises galaxies. The method, which follows an unbinned maximum
likelihood approach, allows the deconvolution of the intrinsic CMASS
colour-colour-magnitude distributions from photometric errors and selection
effects. This procedure requires modeling the covariance matrix for the i-band
magnitude, g-r colour and r-i colour using Stripe 82 multi-epoch data. Our
results indicate that the error-deconvolved intrinsic RS distribution is
consistent, within the photometric uncertainties, with a single point
() in the colour-colour plane at fixed magnitude, for a
narrow redshift slice. We have computed the high-mass end () of the -band RS Luminosity Function (RS LF) in several redshift
slices within the redshift range . In this narrow redshift range,
the evolution of the RS LF is consistent, within the uncertainties in the
modeling, with a passively-evolving model with Mpc mag, fading at a rate of mag per
unit redshift. We report RS completeness as a function of magnitude and
redshift in the CMASS sample, which will facilitate a variety of
galaxy-evolution and clustering studies using BOSS. Our forward-modeling method
lays the foundations for future studies using other dark-energy surveys like
eBOSS or DESI, which are affected by the same type of photometric
blurring/selection effects.Comment: 27 pages, 20 figures, accepted for publication in MNRA
A comparison of cut points for measuring risk factors for adolescent substance use and antisocial behaviors in the U.S. and Colombia
As the identification and targeting of salient risk factors for adolescent substance use become more widely used globally, an essential question arises as to whether U.S.-based cut points in the distributions of these risk factors that identify high risk can be used validly in other countries as well. This study examined proportions of youth at high risk using different empirically derived cut points in the distributions of 18 measured risk factors. Data were obtained from large-scale samples of adolescents in Colombia and the United States. Results indicated that significant (p \u3c 0.05) differences in the proportions of high risk youth were found in 38.9% of risk factors for 6th graders, 61.1% for 8th graders, and 66.6% for 10th graders. Colombian-based cut points for determining the proportion of Colombian youth at high risk were preferable to U.S.-based cut points in almost all comparisons that exhibited a significant difference. Our findings suggest that observed differences were related to the type of risk factor (e.g., drug specific vs. non-drug specific). Findings from this study demonstrate the need for collecting large-scale national data on risk factors for adolescent substance use and developing country-specific cut points based on the distributions of these measures to avoid misidentification of youth at high risk
Left-right asymmetries in polarized scattering
We consider, in the electroweak standard model context, several left-right
asymmetries in elastic scattering at fixed target and collider
experiments. For the former case, we show that the muon mass effects are
important in a wide energy range. We also show that these asymmetries are
sensitive to the electroweak mixing angle . The effect of an extra
neutral vector boson appearing in a 331 model is also considered. The
capabilities of these asymmetries in the search of this extra are
addressed.Comment: RevTeX, 9 pages, 5 gif figure
Phase transitions in tumor growth VI: EpithelialâMesenchymal transition
Herewith we discuss a network model of the epithelialâmesenchymal transition (EMT) based on our previous proposed framework. The EMT appears as a âfirst orderâ phase transition process, analogous to the transitions observed in the chemicalâphysical field. Chiefly, EMT should be considered a transition characterized by a supercritical AndronovâHopf bifurcation, with the emergence of limit cycle and, consequently, a cascade of saddle-foci Shilnikov's bifurcations. We eventually show that the entropy production rate is an EMT-dependent function and, as such, its formalism reminds the van der Waals equation.Fil: Guerra, A.. Universidad de La Habana; CubaFil: Rodriguez, D. J.. Universidad de La Habana; CubaFil: Montero, S.. Medical Sciences University Of Havana; CubaFil: Betancourt Mar, J. A.. Universidad de La Habana; CubaFil: MartĂn Pardo, Reinaldo RomĂĄn. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de Investigaciones en TecnologĂa QuĂmica. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de Investigaciones en TecnologĂa QuĂmica; Argentina. Mexican Institute Of Complex Systems. Tamaulipas; MĂ©xicoFil: Silva Lamar, Eduardo. Universidad de La Habana; CubaFil: Bizzarri, MarĂa Julia. Universidad de La Habana; CubaFil: Cocho, G.. Universidad Nacional AutĂłnoma de MĂ©xico; MĂ©xicoFil: Mansilla, R.. Universidad Nacional AutĂłnoma de MĂ©xico; MĂ©xicoFil: Nieto Villar, JosĂ© Manuel. Universidad de La Habana; Cub
Naturally light right-handed neutrinos in a 3-3-1 Model
In this work we show that light right-handed neutrinos, with mass in the
sub-eV scale, is a natural outcome in a 3-3-1 model. By considering effective
dimension five operators, the model predicts three light right-handed
neutrinos, weakly mixed with the left-handed ones. We show also that the model
is able to explain the LSND experiment and still be in agreement with solar and
atmospheric data for neutrino oscillation.Comment: About 5 pages, no-figure
Marketing strategy of the hospitality industry
BuduÄi da se gospodarstvo sve viĆĄe razvija u smjeru usluĆŸnih djelatnosti, nameÄe se potreba da marketing manageri, marketing struÄnjaci i poduzetnici, ĆĄto bolje upoznaju usluĆŸne djelatnosti i njihovu vaĆŸnost za gospodarstvo svake zemlje, pa i Hrvatske.
Usluge su neopipljive, nedjeljive, nepostojane i prolazne, pa svaki oblik usluga zahtijeva marketing strategiju. Naime, gospodarska usluĆŸna djelatnost omoguÄava proizvodnji da premosti prostor ili segmente trĆŸiĆĄta izmeÄu proizvodnje i potroĆĄnje, kako bi se u odreÄenom vremenu i prostoru uÄinkovito zadovoljile potrebe potroĆĄaÄa i ostvarili ciljevi poduzeÄa, uz planiranu dobit ili profit. U proĆĄlosti, usluĆŸne djelatnosti su znatno zaostajale za proizvodnim poduzeÄima u usvajanju i primjeni marketing koncepcije, no sada se to znatno mijenja. Sukladno s iznesenim, marketing strategija u usluĆŸnim djelatnostima
zahtijeva ne samo vanjski marketing, veÄ i marketing unutar poduzeÄa, kako bi se motivirali djelatnici u pruĆŸanju usluga i podizanju razine kvalitete.Considering the current growth of the hospitality industry, the marketing managers, experts and entrepreneurs should become aware of the growing importance of various hospitality services for the overall industry of each country including the Republic of Croatia.
The services rendered in the hospitality sphere are intangible and unsteady in nature so that each domain necessarily requires a separate marketing strategy. Namely, hospitality services render it possible for the production to span the space, i.e. the different market segments between the supply and demand and meet the consumers needs as well as to achieve the set objectives. In the past years the hospitality industry was considerably falling behind other business enterprises and organizations in the adoption and application of appropriate marketing concepts. It seems, however, that the situation has turned for the better. The hospitality services clearly demand not only an exterior marketing strategy but also a proper marketing technique inside individual establishments in order to achieve a higher level of motivation among the hospitality staff as well as a better quality of service
Elevated myeloid-derived suppressor cells in pancreatic, esophageal and gastric cancer are an independent prognostic factor and are associated with significant elevation of the Th2 cytokine interleukin-13
We undertook a comprehensive analysis of circulating myeloid-derived suppressor cells (MDSCs) and T regulatory cells (Tregs) in pancreatic, esophageal and gastric cancer patients and investigated whether MDSCs are an independent prognostic factor for survival. We evaluated a series of plasma cytokines and in particular re-evaluated the Th2 cytokine interleukin-13 (IL-13). Peripheral blood was collected from 131 cancer patients (46 pancreatic, 60 esophageal and 25 gastric) and 54 healthy controls. PBMC were harvested with subsequent flow cytometric analysis of MDSC (HLADRâ Lin1low/â CD33+ CD11b+) and Treg (CD4+ CD25+ CD127low/â FoxP3+) percentages. Plasma IL-2, IL-4, IL-5, IL-6, IL-10, IL-12 (p70), IL-13, IL-17, G-CSF, IFN-Îł, TNF-α and VEGF levels were analyzed by the Bio-Plex cytokine assay. Plasma arginase I levels were analyzed by ELISA. MDSCs and Tregs were statistically significantly elevated in pancreatic, esophageal and gastric cancer compared with controls, and MDSC numbers correlated with Treg levels. Increasing MDSC percentage was associated with increased risk of death, and in a multivariate analysis, MDSC level was an independent prognostic factor for survival. A unit increase in MDSC percentage was associated with a 22% increased risk of death (hazard ratio 1.22, 95% confidence interval 1.06â1.41). Arginase I levels were also statistically significantly elevated in upper gastrointestinal cancer patients compared with controls. There was Th2 skewing for cytokine production in all three diseases, and importantly there were significant elevations of the pivotal Th2 cytokine interleukin-13, an increase that correlated with MDSC levels
- âŠ