The seminar series are funded by the
Flemish Government and
UGent Doctoral School.

Starting in academic year 2013/2014, the research group hosts a regular series of seminars, dedicated to our wide audience that includes physicists, students and engineers. These seminars feature excellent overviews presented by distinguished speakers and provide high value educational material for students . They prove to be the optimal venue for fruitful discussions between external experts and the group members. These seminars organised with the support of the Flemish Government. and UGent Doctoral Schools.

The program for academic year 2022-2023 can be found below:

December 14th, 2023

(09:30, Campus Proeftuin (INW) – N3 lecture room)

Speaker:  Richard Ruiz (Institute of Nuclear Physics, Polish Academy of Science)

EWK unification and Higgs boson

The lecture dives into the main concepts of the electroweak symmetry breaking and the Higgs boson particle properties within the standard model (SM) of particle physics. We will touch upon the governing symmetries of the SM Lagrangian and write down the key equations that describe the fundamental interactions and properties.

October 24th, 2023

(11:00, Campus Proeftuin (INW) – N3 meeting room)

Speaker:  Prof. Ketino Kaadze (Kansas State University)

The Tau Lepton as a Key to Understanding the Higgs Boson

The observation of the Higgs boson by the ATLAS and CMS experiments at the LHC has opened a new era for particle physics, where characterization of this new object is of crucial importance. Tau leptons are highly important for understanding the true nature of the Higgs boson. The di-tau decay of the Higgs boson is a key channel for direct measurement of Higgs to fermion couplings as well as for significant constraints of Higgs to vector boson couplings. These measurements allow testing CP-violating effects in the Higgs sector. In this talk, I will present recent results on observation of the Higgs boson decaying to a pair of tau leptons and on constraints of the Higgs couplings, as well as discuss future prospects for exploring the Higgs sector with di-tau decay mode.

October 10th, 2023

(11:00, Campus Proeftuin (INW) – N3 meeting room)

Speaker:  Maria Lisa Brozzetti (University of Perugia)

GLADEnet: a progressive web app for multi-messenger cosmology and electromagnetic follow-ups of gravitational-wave sources

Multi-messenger astronomy has recently emerged as a significant field of research to unravel the physics governing the transients associated with the merger of binary systems of stellar compact objects. GW170817 is the first multi-messenger signal generated by the coalescence of a binary system of neutron stars detected by the LIGO and Virgo gravitational-wave interferometers and space-and-ground-based electromagnetic telescopes. It was a majestic example showing how multi-messenger observations significantly enhance our understanding of the physics of compact objects, relativistic outflows and nucleosynthesis. It showed a new way of making cosmology with the potential to resolve the tension between different measurements of the expansion rate of the Universe given by the Hubble constant. However, most of the detected gravitational-wave signals from compact binaries up to date do not have a multi-messenger counterpart, earning them the designation of dark standard sirens. In order to infer cosmological parameters using these signals without electromagnetic counterparts, statistical approaches are used by requiring the knowledge of galaxies within the event localization volume. For this type of study, as well as for optimizing observational strategies or evaluating the efficiency of the searches for counterparts over large sky-localization, the use of galaxy catalogues and the knowledge of their completeness are of paramount importance Here, we describe a new interactive web tool, named GLADEnet, which enables us to evaluate galaxy incompleteness in real-time across the gravitational-wave sky-localization. This measurement is of particular importance when utilizing catalogues such as the GLADE (Galaxy List for the Advanced Detector Era) catalogue which comprises a collection of various catalogues. Hence, its completeness differs across different regions of the sky.

The talk will focus on the analysis steps to define a completeness coefficient and provide a short guide on how to use the web app detailing its functionalities geared towards managing the vast collection of over 22 million objects in GLADE. The completeness coefficient and the GLADE galaxy list will be disseminated in real-time via GLADEnet powered by the Virtual Observatory (VO) standard and tools.