2,740 research outputs found
Exotic Heavy Quarkonium Spectroscopy: A Mini-review
Since nine years experiments have been observing a host of exotic states
decaying into heavy quarkonia. The interpretation of most of them still remains
uncertain and, in some cases, controversial, notwithstanding a considerable
progress has been made on the quality of the experimental information available
and a number of ideas and models have been put forward to explain the
observations. In this mini-review we will summarize the measurements, with the
most recent updates, and list the useful ones yet to be done. We will discuss
the problem of the spin of the X, which could hide some major surprise on its
interpretation, and review some more phenomenological issues debated in the
field.Comment: 14 pages, 2 figures, 5 tables. To appear in Mod. Phys. Lett.
Higher Tetraquark Particles
There are strong arguments favoring a four-quark interpretation of sub-GeV
light scalar mesons and the diquark-antidiquark body-plan of the tetraquark
seems to provide the most convincing picture. The building diquarks of these
particles are assumed to be spin zero objects. In this paper we explore the
possibility that radially excited aggregations of spin zero or spin one
diquarks might exist and discuss the possibility of the Y(2175) state observed
by BaBar and confirmed by BES being one such state.Comment: 8 pages, 4 figure
Resistance of European spring 2-row barley cultivars to Pyrenophora graminea and detection of associated loci
Pyrenophora graminea is the seed-borne pathogen causal agent of barley leaf stripe disease.
In this work, we screened a collection of 206 spring two-row barley cultivars from Europe for their
resistance to the fungal pathogen. Artificial inoculation with the highly virulent isolate Dg2 revealed
a continuous variation for the incidence of infection, with few highly resistant or highly susceptible
genotypes. On average, old cultivars showed higher resistance than the more modern ones. Genome-
Wide Association Scan was performed by exploiting available molecular data for >4000 SNP markers
and revealed a single, highly significant association on the short arm of chromosome 6H, in a genomic
position where quantitative trait loci (QTL) for barley resistance to P. graminea were not detected
before. Based on the last version of the reference barley genome, genes encoding for proteins with a
kinase domain were suggested as candidates for the locus
Otoacaríase psoróptica dos caprinos-Infestação subclínica
Naturally occuring subclinical psoroptic otoacariasis in goats is reported in Pernambuco and Rio de Janeiro State. Infestation rates of 59.3% and 46% were observed in goats for about twelve months of age in the States of Pernambuco and Rio de Janeiro, respectively.A otoacaríase psoróptica subclínica dos caprinos é assinalada nos Estados de Pernambuco e Rio de Janeiro. Índices de infestação de 59,3% e 46% foram observados em animais com idade aproximada de doze meses, criados no Estados de Pernambuco e Rio de Janeiro, respectivamente.
In silico validation of MCID tool for voxel dosimetry applied to 90Y radioembolization of liver malignancies
The aim of this work is validating the Monte Carlo Internal Dosimetry (MCID) tool for internal dosimetry, which allows personalized treatment planning starting from patient-specific images and direct Monte Carlo (MC) simulations.
The absorbed dose for different computational phantoms, calculated with MC and with conventional MIRD methods at both organ and voxel level, were compared, obtaining differences of about 0.3% and within 3%, respectively, whereas differences increased (up to 14%) introducing tissue heterogeneities in phantoms. The absorbed dose of spheres with different radius (10 mm ≤ r ≤ 30 mm), calculated from MC code and from OLINDA/EXM was also compared, obtaining differences varying in the range 2–9% after correcting for partial volume effects (PVEs) from imaging.
This work validated the MCID tool which allows the fast generation of input macros for MC simulations, starting from patient-specific images. It also shows the impact of tissue inhomogeneities on dosimetric results and their relevance for an accurate dosimetric plan
The contribution of faint AGNs to the ionizing background at z~4
Finding the sources responsible for the hydrogen reionization is one of the
most pressing issues in cosmology. Bright QSOs are known to ionize their
surrounding neighborhood, but they are too few to ensure the required HI
ionizing background. A significant contribution by faint AGNs, however, could
solve the problem, as recently advocated on the basis of a relatively large
space density of faint active nuclei at z>4. We have carried out an exploratory
spectroscopic program to measure the HI ionizing emission of 16 faint AGNs
spanning a broad U-I color interval, with I~21-23 and 3.6<z<4.2. These AGNs are
three magnitudes fainter than the typical SDSS QSOs (M1450<~-26) which are
known to ionize their surrounding IGM at z>~4. The LyC escape fraction has been
detected with S/N ratio of ~10-120 and is between 44 and 100% for all the
observed faint AGNs, with a mean value of 74% at 3.6<z<4.2 and
-25.1<M1450<-23.3, in agreement with the value found in the literature for much
brighter QSOs (M1450<~-26) at the same redshifts. The LyC escape fraction of
our faint AGNs does not show any dependence on the absolute luminosities or on
the observed U-I colors. Assuming that the LyC escape fraction remains close to
~75% down to M1450~-18, we find that the AGN population can provide between 16
and 73% (depending on the adopted luminosity function) of the whole ionizing UV
background at z~4, measured through the Lyman forest. This contribution
increases to 25-100% if other determinations of the ionizing UV background are
adopted. Extrapolating these results to z~5-7, there are possible indications
that bright QSOs and faint AGNs can provide a significant contribution to the
reionization of the Universe, if their space density is high at M1450~-23.Comment: Accepted for publication on A&A, 16 pages, 22 figure
Multi-GeV Electron Spectrometer
The advance in laser plasma acceleration techniques pushes the regime of the
resulting accelerated particles to higher energies and intensities. In
particular the upcoming experiments with the FLAME laser at LNF will enter the
GeV regime with almost 1pC of electrons. From the current status of
understanding of the acceleration mechanism, relatively large angular and
energy spreads are expected. There is therefore the need to develop a device
capable to measure the energy of electrons over three orders of magnitude (few
MeV to few GeV) under still unknown angular divergences. Within the PlasmonX
experiment at LNF a spectrometer is being constructed to perform these
measurements. It is made of an electro-magnet and a screen made of
scintillating fibers for the measurement of the trajectories of the particles.
The large range of operation, the huge number of particles and the need to
focus the divergence present unprecedented challenges in the design and
construction of such a device. We will present the design considerations for
this spectrometer and the first results from a prototype.Comment: 7 pages, 6 figures, submitted to NIM
CONTRIBUTIONS TO RICKETTSIOSES RESEARCH IN COLOMBIA (1917-1943), LUIS B. PATIÑO CAMARGO
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