Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements

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Autógrafo original de "José Eustasio Rivera" a tinta.Encuadernación en cartón forrado en cuero con ilustración en la cubierta frontal, marca del editor en la cubierta posterior, canto color rojo, texto de la portada a dos tintas roja y negra, manchas por acidez, lomo deteriorado, Incluye al final de la obra un catálogo de la casa editorial Maucci, sellos de propiedad de los antiguos poseedores: "Librerías del Periodismo y Renacimiento Leónidas Peña Sánchez, Bogotá", "Bibliotheca Professorum Litteraturae Provin. Colom. JHS" sello que perteneció a la (Biblioteca de Profesores de Santa Rosa de Viterbo) y en manuscrito de "José Eustasio Rivera".Hoffmann, Ernst Theodor Amadeus, 1776-182