Talks and presentations

Nesta palestra, discutiremos a importância dos neutrinos para o avanço do nosso entendimento do mundo microscópico. A proposta é oferecer uma visão geral do tema, começando pelas tentativas de compreender o espectro do decaimento beta, passando pela descoberta dos neutrinos e seu papel fundamental na construção do Modelo Padrão, até chegarmos aos problemas em aberto na área. Ao final, comentarei também alguns tópicos que venho estudando com mais profundidade em minha pesquisa.

In this talk we show that pseudoscalar meson leptonic decay data can be used to set stringent limits on the mass \(m_{W_R}\) of a right-handed vector boson, such as the one that appears in left-right symmetric models. We have shown that for a heavy neutrino with a mass \(m_N\) in the range \(50<m_N/{\rm MeV} <1900\) one can constraint \(m_{W_R} \gtrsim (4-19)\) TeV at 90% CL. This provides the most stringent experimental limits on the \(W_R\) mass to date for this heavy neutrino mass range.

The discovery of ultra-high-energy neutrinos by IceCube marked the beginning of neutrino astronomy. Yet, the origin and production mechanisms of these neutrinos remain open questions. With the recent observation of the highest-energy neutrino event to date by the KM3NeT collaboration, transient sources—astrophysical objects that emit particles in brief, localized bursts—have emerged as promising candidates. In this work, we revisit the identification of such sources in IceCube and future neutrino telescopes, focusing on how both the timing and sky localization of the source affect the detection sensitivity. We highlight the crucial role of the source’s right ascension in determining the effective area of detectors not located at the poles, such as KM3NeT, and present a framework to consistently account for this dependence. As a case study, we investigate evaporating primordial black holes (PBHs) as transient neutrino sources, showing that the detection prospects and localization accuracy are strongly influenced by the PBH’s position in the sky. Our results emphasize the complementarity between neutrino and gamma-ray observatories and showcase the potential of a global network of neutrino detectors to identify and localize transient events that might be missed by traditional photon-based instruments.

Neutrino oscillations are a nature given interferometer and as such is a door to better explore the quantum realm. In this work we address the question of how to compute the neutrino wavepacket width from first principles based on decoherence models. We show how the relevant parameters end up fixed solely by the mother particle interactions.

In this talk we show that pseudoscalar meson leptonic decay data can be used to set stringent limits on the mass \(m_{W_R}\) of a right-handed vector boson, such as the one that appears in left-right symmetric models. We have shown that for a heavy neutrino with a mass \(m_N\) in the range \(50<m_N/{\rm MeV} <1900\) one can constraint \(m_{W_R} \gtrsim (4-19)\) TeV at 90% CL. This provides the most stringent experimental limits on the \(W_R\) mass to date for this heavy neutrino mass range.

In this talk we show that pseudoscalar meson leptonic decay data can be used to set stringent limits on the mass \(m_{W_R}\) of a right-handed vector boson, such as the one that appears in left-right symmetric models. We have shown that for a heavy neutrino with a mass \(m_N\) in the range \(50<m_N/{\rm MeV} <1900\) one can constraint \(m_{W_R} \gtrsim (4-19)\) TeV at 90% CL. This provides the most stringent experimental limits on the \(W_R\) mass to date for this heavy neutrino mass range.

In this talk we show that pseudoscalar meson leptonic decay data can be used to set stringent limits on the mass \(m_{W_R}\) of a right-handed vector boson, such as the one that appears in left-right symmetric models. We have shown that for a heavy neutrino with a mass \(m_N\) in the range \(50<m_N/{\rm MeV} <1900\) one can constraint \(m_{W_R} \gtrsim (4-19)\) TeV at 90% CL. This provides the most stringent experimental limits on the \(W_R\) mass to date for this heavy neutrino mass range.

In this talk we show that pseudoscalar meson leptonic decay data can be used to set stringent limits on the mass \(m_{W_R}\) of a right-handed vector boson, such as the one that appears in left-right symmetric models. We have shown that for a heavy neutrino with a mass \(m_N\) in the range \(50<m_N/{\rm MeV} <1900\) one can constraint \(m_{W_R} \gtrsim (4-19)\) TeV at 90% CL. This provides the most stringent experimental limits on the \(W_R\) mass to date for this heavy neutrino mass range.

We explore the neutrino sector of the minimal left-right symmetric model, with the additional charge conjugation discrete symmetry, in the novel regime where type-I and type-II seesaw mechanisms are equally responsible for the light neutrino masses, which can result in large active-sterile mixing. We show that unless the charged lepton mixing matrix is the identity and the right handed neutrino mass matrix has no phases, we expect sizable lepton flavor violation and electron dipole moment in this region. We use recent results from neutrino oscillation fits, bounds on neutrinoless double beta decay, \(\mu \to e \gamma\), \(\mu \to 3e\), \(\mu \to e\) conversion in nuclei, the muon anomalous magnetic moment, the electron electric dipole moment, the CDF II determination of the \(W\) boson mass and cosmology to determine the viability of this region. We derive stringent limits on the heavy neutrino masses and mixing angles as well as on the vacuum expectation value, which drives the type-II seesaw contribution, using the current data. We discuss the perspectives of probing the remaining parameter space by future experiments.