Descripción del proyecto
Confirmar la «debilidad» en el modelo estándar
Los descubrimientos científicos son, con mucha mayor frecuencia, el resultado de hipótesis bien pensadas y de investigaciones experimentales y teóricas que de observaciones fortuitas y momentos de revelación. Incluso el presunto episodio de la manzana de Isaac Newton condujo probablemente a años de reflexión, que culminaron en su primer artículo publicado sobre el tema de la gravedad unos veinte años más tarde. Cuando se trata de la física de partículas, no sirve esperar un momento de revelación: el descubrimiento es técnicamente difícil incluso con los planes mejor trazados. En lugar de dejar los descubrimientos a merced de la suerte, el proyecto financiado con fondos europeos NEPAL está sentando las bases para el análisis de datos del último experimento diseñado para realizar mediciones precisas de la interacción débil, lo cual pone en duda el modelo estándar de la física de partículas de hace medio siglo.
Objetivo
If the Standard Model (SM) of particle physics succeeds in describing the behaviour of fundamental constituents of matter and their interactions observed experimentally, it is unable to solve the most important riddles of our time such as the nature of the dark matter or the origin of the matter-antimatter asymmetry of the Universe. Manifestations of physics beyond the SM are extensively searched for, in particular through heavy flavour decays that are rare or forbidden in the SM. In this domain, final states involving electrons and muons are widely studied while channels involving tau leptons are much less known because of their challenging reconstruction. The interest of decays involving tau leptons is also dramatically reinforced by the recent anomalies reported in tests of lepton flavour universality violation and rare B decays, suggesting a special role of the third family. In particular, in the presence of physics beyond the SM, lepton flavour violating tau decays and rare B decays into tau leptons could be just below the current experimental limits.
With the NEPAL project, I propose to build a team of analysts that will exploit the world’s largest B and tau samples recorded in the clean environment of an electron/positron machine by the Belle II experiment. The full detector operation will start end 2018 and aims at recording five times more statistic than the total previous flavour-factory experiments by 2020, and a final dataset of 50 inverse attobarns by 2025.
Thanks to the development of a common analysis framework, sophisticated machine learning techniques for signal selections, the use of a full event interpretation and the reconstruction of 95% of tau decays, my team will search for more than thirty lepton flavour violating tau decays and rare B decays into tau leptons. This will allow to set the world’s best limits in the best possible timescale, reshaping the landscape of searches for physics beyond the Standard Model.
Ámbito científico
Palabras clave
Programa(s)
Régimen de financiación
ERC-COG - Consolidator GrantInstitución de acogida
75794 Paris
Francia