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En este artículo se presenta una revisión de la búsqueda de partículas neutras con tiempo de vida largos. El formalismo esencial que determina el número de partículas con tiempos de vida largos se presenta. Leptones neutros pesados pueden ser un tipo de partícula con tiempo de vida largo. Un resumen de los resultados principales de búsquedas de colisionadores y de blanco fijo son presentados. Se discute también la nueva generación de experimentos y su impacto en el espacio de parámetros relevante de la intensidad de acoplamiento y masa de los leptones neutros pesados.
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Derechos de autor 2019 Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales