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Un enlace mejorado en el momento dipolo eléctrico del electrón

Tanya S Roussy^1,2, Luke Caldwell^1,2, Trevor Wright^1,2

¹JILA, NIST and University of Colorado, Boulder, CO 80309, USA.

Science (New York, N.Y.)

|July 6, 2023

Resumen

Los científicos midieron el momento dipolo eléctrico de electrones (eEDM) utilizando iones moleculares. El resultado preciso, consistente con cero, establece nuevos límites para las partículas no descubiertas y una nueva física más allá del alcance del colisionador actual.

Área de la Ciencia:

Física de las partículas
Mecánica Cuántica
Cosmología

Sus antecedentes:

La asimetría materia-antimateria del universo sugiere nuevas partículas más allá del Modelo Estándar.
Tales nuevas partículas podrían inducir un momento dipolo eléctrico del electrón (eEDM) a través de interacciones con fluctuaciones de vacío cuántico.
La búsqueda de eEDM proporciona una sonda sensible para la física más allá del Modelo Estándar.

Objetivo del estudio:

Para realizar la medición más precisa del momento dipolo eléctrico de electrones (eEDM) hasta la fecha.
Para restringir las teorías de la nueva física mediante el establecimiento de límites estrictos en eEDM.
Investigar las posibles fuentes de violación de la paridad de carga en las interacciones fundamentales.

Principales métodos:

Utilizando electrones confinados dentro de iones moleculares para amplificar la sensibilidad al eEDM.
Aplicando un gran campo eléctrico intramolecular a los electrones atrapados.
Mantener una evolución coherente del estado cuántico durante períodos prolongados (hasta 3 segundos).

Principales resultados:

El eEDM medido es consistente con cero.
El estudio mejora el anterior mejor límite superior de eEDM en aproximadamente un factor de 2,4.
Los resultados proporcionan limitaciones significativas en nuevos modelos físicos en escalas de energía por encima de [Fórmula: ver texto] electronvoltios.

Conclusiones:

La ausencia de un eEDM detectable impone fuertes restricciones a las teorías que predicen tal momento.
Los hallazgos limitan el espacio de parámetros para muchas extensiones propuestas al Modelo Estándar.
Este experimento demuestra el poder de las mediciones de precisión en iones moleculares para las búsquedas fundamentales de la física.

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