6,743 research outputs found
Minimal extended flavor groups, matter fields chiral representations, and the flavor question
We show the specific unusual features on chiral gauge anomalies cancellation
in the minimal, necessarily 3-3-1, and the largest
3-4-1 weak isospin chiral gauge semisimple group leptoquark-bilepton
extensions of the 3-2-1 conventional standard model of nuclear and
electromagnetic interactions. In such models a natural explanation for the
fundamental question of fermion generation replication arises from the
self-consistency of a local gauge quantum field theory, which constrains the
number of the
QFD fermion families to the QCD color charges.Comment: 10 pages. <[email protected]
Radio continuum observations of local star-forming galaxies using the Caltech Continuum Backend on the Green Bank Telescope
We observed radio continuum emission in 27 local (D < 70 Mpc) star-forming
galaxies with the Robert C. Byrd Green Bank Telescope between 26 GHz and 40 GHz
using the Caltech Continuum Backend. We obtained detections for 22 of these
galaxies at all four sub-bands and four more marginal detections by taking the
average flux across the entire bandwidth. This is the first detection (full or
marginal) at these frequencies for 22 of these galaxies. We fit spectral energy
distributions (SEDs) for all of the four-sub-band detections. For 14 of the
galaxies, SEDs were best fit by a combination of thermal free-free and
nonthermal synchrotron components. Eight galaxies with four-sub-band detections
had steep spectra that were only fit by a single nonthermal component. Using
these fits, we calculated supernova rates, total number of equivalent O stars,
and star formation rates within each ~23 arcsecond beam. For unresolved
galaxies, these physical properties characterize the galaxies' recent star
formation on a global scale. We confirm that the radio-far-infrared correlation
holds for the unresolved galaxies' total 33 GHz flux regardless of their
thermal fractions, though the scatter on this correlation is larger than that
at 1.4 GHz. In addition, we found that for the unresolved galaxies, there is an
inverse relationship between the ratio of 33 GHz flux to total far-infrared
flux and the steepness of the galaxy's spectral index between 1.4 GHz and 33
GHz. This relationship could be an indicator of the timescale of the observed
episode of star formation.Comment: 36 pages, 9 figures; accepted for publication in ApJ. First and
second author affiliation updated to reflect departmental name chang
Investigation of Hamamatsu H8500 phototubes as single photon detectors
We have investigated the response of a significant sample of Hamamatsu H8500
MultiAnode PhotoMultiplier Tubes (MAPMTs) as single photon detectors, in view
of their use in a ring imaging Cherenkov counter for the CLAS12 spectrometer at
the Thomas Jefferson National Accelerator Facility. For this, a laser working
at 407.2nm wavelength was employed. The sample is divided equally into standard
window type, with a spectral response in the visible light region, and
UV-enhanced window type MAPMTs. The studies confirm the suitability of these
MAPMTs for single photon detection in such a Cherenkov imaging application
Comment on ``Majoron emitting neutrinoless double beta decay in the electroweak chiral gauge extensions''
We point out that if the majoron-like scheme is implemented within a 331
model, there must exist at least three different mass scales for the scalar
vacuum expectation values in the model.Comment: 4 pages, no figures, Revtex. To be published in Physical Review
Quantization of eletric charge, the neutrino and generation nonuniversality
text of abstract It is showed that the eletric charge quantization is
unconnected to Majorana neutrino in the non-universal generations
leptoquark-bilepton flavordynamics which includes the right-handed neutrino and
an explicit U(1) factor in the gauge semisimple group.Comment: 4 pages, latex ps, no figure
Remark on the vectorlike nature of the electromagnetism and the electric charge quantization
In this work we study the structure of the electromagnetic interactions and
the electric charge quantization in gauge theories of electroweak interactions
based on semi-simple groups. We show that in the standard model of the
electroweak interactions the structure of the electromagnetic interactions is
strongly correlated to the quantization pattern of the electric charges. We
examine these two questions also in all possible chiral bilepton gauge models
of the electroweak interactions. In all they we can explain the vectorlike
nature of the electromagnetic interactions and the electric charge quantization
together demanding nonvanishing fermion masses and the anomaly cancellations.Comment: 17 pages, latex, no figure
Assessing the impact of tourist flows on emergency department treatment speed for residents and tourists. The case of Sorrento
Tourism is a fundamental lever of the economic and cultural development of a location. Large tourist flows can negatively impact the provision of public services, such as healthcare. This study aims to investigate emergency department (ED) treatment speed under increased demand caused by tourism. The analysis was conducted on data (covering March–October 2018) collected from the ED of a hospital in Sorrento, a renowned coastal tourist destination in Campania, Italy, by using a two-step strategy. First, we resort to the Kaplan-Meier method to compare treatment in the ED between residents and tourists. Second, through the Cox proportional hazards model, we study the impact of group-specific characteristics on the speed of treatment. The main empirical findings highlight that treatment speed is highly influenced by age and by the languages spoken by tourists. Foreign tourists are best served in off-peak periods, while in the peak arrival period, the healthcare system experiences difficulties, especially for those facing higher language barriers. What emerges is the necessity for a tourism destination to adopt measures to cope with the language heterogeneity of tourists. In a multi-cultural touristic context, healthcare providers and institutions should address the challenge of language barriers by using specialist interpreter services
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