Prochains séminaires
Talk 1 - NN
Abstract:
Talk 2 - NN
Talk 3 - NN
Abstract:
Talk 1 - NN
Abstract:
Talk 2 - NN
Talk 3 - NN
Abstract:
Talk 1 - NN
Abstract:
Talk 2 - NN
Talk 3 - NN
Abstract:
Talk 1 - NN
Abstract:
Talk 2 - NN
Talk 3 - NN
Abstract:
Abstract: ...
5 derniers séminaires
Abstract: The Belle II experiment at the SuperKEKB collider provides a rich programme of flavor physics measurements, offering opportunities to test the Standard Model and search for indirect signs of physics beyond it. Rare and suppressed B-meson decays are particularly interesting in this context, as they provide sensitivity to fundamental parameters and hadronic effects that are difficult to access through other processes. This seminar will introduce the physics opportunities offered by Belle II, with a particular focus on the radiative leptonic decay B⁺ → ℓ⁺ ν_ℓ γ, which provides access to the internal structure of the B meson through its light-cone distribution amplitude and the poorly constrained inverse moment λ_B.
The analysis exploits the recoil-mass technique, which enables the identification of signal decays by reconstructing the accompanying B meson in the event. A key challenge is achieving sufficient efficiency and purity in this reconstruction while retaining sensitivity to the signal-side kinematics. The seminar will discuss the analysis strategy and the development of new B-tagging techniques aimed at improving reconstruction efficiency and background suppression, with the broader goal of enabling precise recoil-based measurements at Belle II. The seminar will also provide an introduction to the underlying concepts and experimental techniques, making it suitable for PhD students and anyone curious about flavour physics and B-tagging.
Abstract: For about two decades, the IceCube Neutrino Observatory has been detecting ~TeV-PeV neutrinos from mostly unidentified extraterrestrial sources. Active galactic nuclei (AGN), powered by supermassive black holes, are theoretically among the most likely source candidates. However, observationally, their connection remains tenuous so far. Despite the detection of a few hundred extragalactic neutrinos, only a handful of AGNs can be considered as likely neutrino emitters. Namely, NGC 1068 (a Seyfert-II AGN) is the hottest spot in the diffuse ~TeV neutrino sky and TXS 0506+056 (a jetted AGN with its jet oriented toward Earth, i.e., a blazar) constitutes the most promising source candidate with individual ≳100 TeV neutrinos.
In my talk, I will review our current understanding of the AGN–neutrino connection. I will discuss how the limited angular resolution of the current generation of the neutrino data has made establishing a connection between AGN and neutrinos so challenging. I will then present variability as a powerful tool to leverage the precise arrival time of the neutrinos in order to overcome this limitation. Lastly, I will showcase recent results from the most extensive blazar–neutrino spatio-temporal correlation studies where jetted-AGN variability played a central role in the correlation search.
Bio: Pouya Kouch is a postdoc at the University of Turku in Finland. He is interested in unraveling the origin of extraterrestrial high-energy neutrinos and has focused on their potential connection to active galactic nuclei (AGN) jets powered by supermassive black holes. He also utilises multi-wavelength polarisation observations to answer open questions about the physics at play in AGN jets. Beyond research, he has been the President of the Finnish Astronomical Society since 2024.
Abstract: The development of the Stawell Underground Physics Laboratory (SUPL), the only active deep underground laboratory in the Southern Hemisphere, has catalysed low-background research in Australia, spanning rare-event physics searches, underground radiobiology and quantum technologies. With radon representing a significant background for many of these activities, Australia’s radon research program has grown alongside them, including the establishment of the DREAMR radon facility at the Australian National University.
This seminar will give an overview of radon research in Australia, from fundamental physics and activities at SUPL to emerging industrial applications. I will also discuss the development of Radon Zero Backgrounds, a new international network connecting laboratories and experiments to share expertise, facilities and measurements, building on established international collaborations including here at CPPM/CNRS/AMU.
Abstract: Argon is a good scintillator with unique pulse-shape-discrimination capabilities and, as a noble element, is a good material to drift electrons released after ionization. Its potential to detect dark matter was impacted by the presence of Ar-39, a cosmogenically induced radioactive isotope that beta-decays with long lifetime and an endpoint of 565 keV. The Global Argon Dark Matter Collaboration gathered the international community performing DM searches with Ar targets towards a common project, DarkSide-20k, which is building a detector based on Underground Ar, in which the radioactivity of Ar is reduced by a factor >1000. In this talk I will explain the different projects going on under the GADMC umbrella, the physics potential and the status of the construction efforts.
Abstract:
Quantum entanglement—one of the most intriguing features of quantum mechanics—is not only a cornerstone of emerging technologies but also a powerful new lens through which to explore the fundamental laws of nature. In this talk, Fabio Maltoni will show how ideas from quantum information are reshaping our understanding of high-energy particle physics, from the behavior of quarks and gluons to the structure of observed events at colliders. Aimed at a broad audience, this presentation will offer an accessible journey into how entanglement helps physicists probe the deepest layers of reality.
The speaker:
Fabio Maltoni is a theoretical physicist working in particle physics, with a focus on the phenomenology of strong interactions. He studied at the University of Bologna and obtained his PhD from the University of Pisa, conducting part of his research at CERN, where he worked on quarkonium phenomenology. He subsequently built an international career through several postdoctoral positions in Europe and the United States, including appointments in Torino, Illinois, Rome, and at CERN. He is currently Professor at the Centre for Cosmology, Particle Physics and Phenomenology (CP3) at the Université catholique de Louvain, and also holds a professorship at the University of Bologna. He has also contributed to European science policy as a member of the European Strategy Group responsible for updating the European roadmap for particle physics.
