EVALITA Evaluation of NLP and Speech Tools for Italian - December 17th, 2020

Welcome to EVALITA 2020! EVALITA is the evaluation campaign of Natural Language Processing and Speech Tools for Italian. EVALITA is an initiative of the Italian Association for Computational Linguistics (AILC, http://www.ai-lc.it) and it is endorsed by the Italian Association for Artificial Intelligence (AIxIA, http://www.aixia.it) and the Italian Association for Speech Sciences (AISV, http://www.aisv.it)

Production of antihydrogen in relativistic collisions

The production of antihydrogen atoms Full-size image (<1 K) has been observed by the PS210 collaboration at LEAR. The method assumes an e+e− -pair creation via the two-photon mechanism in the antiproton-nucleus interaction. Neutral H̄0 atoms are identified by a unique sequence of characteristics. The typical signature of eleven produced antihydrogen atoms is reported including possibly 2±1 background signals. The observed yield agrees with theoretical predictions

Observation of antihydrogen production in flight at CERN

The observation of the production of antihydrogen atoms H̄0 = p̄e+, the simplest atomic bound state of antimatter, is presented. A method has been used by the PS210 collaboration at LEAR which assumes that the production of H̄0 is predominantly mediated by the e+e--pair creation via the two-photon mechanism in the antiproton-nucleus interaction. Neutral H̄0 atoms are indentified by a unique sequence of characteristics. In principle H̄0 is well suited for investigations of fundamental CPT violation studies under different forces, however, in our investigations we concentrate on the production of this antimatter object, since so far it had not been observed. The production of eleven antihydrogen atoms is reported including possibly 2 ± 1 background signals, the observed yield agrees with theoretical predictions

Production of antihydrogen

Results are presented for a measurement for the production of the antihydrogen atom , the simplest atomic bound state of antimatter. A method has been used by the PS210 collaboration at LEAR which assumes that the production of is predominantly mediated by the e+e−-pair creation via the two-photon mechanism in the antiproton-nucleus interaction. Neutral atoms are identified by a unique sequence of characteristics. In principle is well suited for investigations of fundamental CPT violation studies under different forces, however, in our investigations we concentrate on the production of this antimatter object, since so far it has never been observed before. The production of 11 antihydrogen atoms is reported including possibly 2±1 background signals, the observed yield agrees with theoretical predictions

RESULTS FROM (P)OVER-BAR-P-]PHI-PHI

The reaction ($) over bar pp --&gt; phi phi is investigated in the JETSET (PS202) experiment using an internal target in LEAR. Data have been analysed at a variety of beam momenta from 1.2 GeV/c to 2.0 GeV/c, corresponding to centre-of-mass energies between</p

OBSERVATION OF PHI-PHI PRODUCTION IN THE REACTION (P)OVER-BAR-P-]4K(+/-) AT 1.4 GEV/C INCIDENT (P)OVER-BAR MOMENTUM

The JETSET (PS202) experiment at CERN-LEAR searches for hadronic resonances by means of in-flight antiproton-proton annihilations in the reaction ($) over bar pp --&gt; phi phi. In order to obtain sufficient luminosity and good final-state mass resolution, t</p

Production of antihydrogen in relativistic collisions

The production of antihydrogen atoms H̄0 ≡ p̄e+ has been observed by the PS210 collaboration at LEAR. The method assumes an e+e- -pair creation via the two-photon mechanism in the antiproton-nucleus interaction. Neutral H̄0 atoms are identified by a unique sequence of characteristics. The typical signature of eleven produced antihydrogen atoms is reported including possibly 2±1 background signals. The observed yield agrees with theoretical predictions