3,344 research outputs found
A study of bB production mechanisms in Pythia
The influence of the Pt_hat cutoff on the production of bB events in Pythia has been studied. Versions 5.75, 6.125 and 6.152 have been considered
Results on Proton-Irradiated 3D Pixel Sensors Interconnected to RD53A Readout ASIC
Test beam results obtained with 3D pixel sensors bump-bonded to the RD53A
prototype readout ASIC are reported. Sensors from FBK (Italy) and IMB-CNM
(Spain) have been tested before and after proton-irradiation to an equivalent
fluence of about cm (1 MeV
equivalent neutrons). This is the first time that one single collecting
electrode fine pitch 3D sensors are irradiated up to such fluence bump-bonded
to a fine pitch ASIC. The preliminary analysis of the collected data shows no
degradation on the hit detection efficiencies of the tested sensors after high
energy proton irradiation, demonstrating the excellent radiation tolerance of
the 3D pixel sensors. Thus, they will be excellent candidates for the extreme
radiation environment at the innermost layers of the HL-LHC experiments.Comment: Conference Proceedings of VCI2019, 15th Vienna Conference of
Instrumentation, February 18-22, 2019, Vienna, Austria. arXiv admin note:
text overlap with arXiv:1903.0196
Global and Regional IUCN Red List Assessments: 1
In this contribution, the conservation status assessment of six plant species according to IUCN categories and criteria are presented. It includes the assessment at global level of Linaria tonzigii Lona, Allium garganicum Brullo, Pavone, Salmeri & Terrasi, Ferula arrigonii Bocchieri, Orchis patens Desf. subsp. patens and Armeria saviana Selvi and the assessment at regional level (Italy) of Viola jordanii Hanry
Global and Regional IUCN Red List Assessments: 5
In this contribution, the conservation status of four vascular plants according to IUCN categories and criteria are presented. It includes the assessment of Arceuthobium oxycedri (DC.) M.Bieb., Ionopsidium albiflorum Durieu, Trifolium latinum Sebast., and Vicia incisa M.Bieb. at a Regional level (Italy)
Global and Regional IUCN Red List Assessments: 2
In this contribution the conservation status assessment of six plant species according to IUCN categories and criteria are presented. It includes the assessment at global level of Charybdis glaucophylla Bacch., Brullo, D’Emerico, Pontec. & Salmeri, Euphorbia nicaeensis All. subsp. japygica (Ten.) Arcang., Hieracium australe Fr. subsp. australe, Limonium multiforme Pignatti, Onosma helvetica Boiss. em. Teppner subsp. lucana (Lacaita) Peruzzi, Aquaro & Cesca and the assessment at national level (Italy) of Lathyrus laxiflorus (Desf.) Kuntze subsp. laxiflorus
Global and Regional IUCN Red List Assessments: 4
In this contribution, the conservation status assessments of three vascular plants are presented following to IUCN categories and criteria. It includes the assessment at global level of Saxifraga caprariae Mannocci, Ferretti, Mazzoncini & Viciani and S. montis-christi Mannocci, Ferretti, Mazzoncini & Viciani and the regional assessment of Halocnemum cruciatum (Forssk.) Tod. (Spain)
Red Listing plants under full national responsibility: Extinction risk and threats in the vascular flora endemic to Italy
Taxa endemic to a country are key elements for setting national conservation priorities and for driving conservation
strategies, since their persistence is entirely dependent on national policy. We applied the IUCN Red
List categories to all Italian endemic vascular plants (1340 taxa) to assess their current risk of extinction and to
highlight their major threats. Our results revealed that six taxa are already extinct and that 22.4% (300 taxa) are
threatened with extinction, while 18.4% (247; especially belonging to apomictic groups) have been categorized
as Data Deficient. Italian endemic vascular plants are primarily threatened by natural habitat modification due
to agriculture, residential and tourism development. Taxa occurring in coastal areas and lowlands, where anthropogenic
impacts and habitat destruction are concentrated, display the greatest population decline and extinction.
The national network of protected areas could be considered effective in protecting endemic-rich areas (ERAs) and endemic taxa, but ineffective in protecting narrow endemic-rich areas (NERAs), accordingly changes
to the existing network may increase the effectiveness of protection. For the first time in the Mediterranean Basin
biodiversity hotspot, we present a comprehensive extinction assessment for endemic plants under the full responsibility
of a single country. This would provide an important step towards the prioritization and conservation
of threatened endemic flora at Italian, European, and Mediterranean level. A successful conservation
strategy of the Italian endemic vascular flora should implement the protected area system, solve some taxonomical
criticism in poorly known genera, and should rely on monitoring threatened species, and on developing
species-specific action plans
Constraints on the χ_(c1) versus χ_(c2) polarizations in proton-proton collisions at √s = 8 TeV
The polarizations of promptly produced χ_(c1) and χ_(c2) mesons are studied using data collected by the CMS experiment at the LHC, in proton-proton collisions at √s=8 TeV. The χ_c states are reconstructed via their radiative decays χ_c → J/ψγ, with the photons being measured through conversions to e⁺e⁻, which allows the two states to be well resolved. The polarizations are measured in the helicity frame, through the analysis of the χ_(c2) to χ_(c1) yield ratio as a function of the polar or azimuthal angle of the positive muon emitted in the J/ψ → μ⁺μ⁻ decay, in three bins of J/ψ transverse momentum. While no differences are seen between the two states in terms of azimuthal decay angle distributions, they are observed to have significantly different polar anisotropies. The measurement favors a scenario where at least one of the two states is strongly polarized along the helicity quantization axis, in agreement with nonrelativistic quantum chromodynamics predictions. This is the first measurement of significantly polarized quarkonia produced at high transverse momentum
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