Next Seminars


Mar 11, 2024
Current status of dark matter from a theory perspective
Nicolás Bernal (Universidad Antonio Nariño)
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Start:
Monday, March 11, 2024 at 2:00:00 PM Central European Standard Time
End:
Monday, March 11, 2024 at 3:30:00 PM Central European Standard Time
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Mar 18, 2024
Unraveling cosmology with cosmic voids
Alice Pisani (Princeton University)
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Description :
Modern surveys provide access to high-quality measurements on large areas of the sky, sampling the galaxy distribution in detail also in the emptiest regions, voids. Void cosmology is becoming an increasingly active sector of galaxy clustering analysis: by measuring void properties, such as density profiles or void number counts, it is possible to constrain cosmological parameters. Cosmic voids are particularly sensitive to the properties of dark energy and neutrinos, and are a powerful tool to test modifications of the laws of general relativity. Studying voids provides a novel perspective to unravel the unsolved mysteries of our Universe. 
In this talk I introduce cosmic voids as a tool for cosmology, I present recent results and I discuss current challenges and future developments in the field.
 
Start:
Monday, March 18, 2024 at 2:00:00 PM Central European Standard Time
End:
Monday, March 18, 2024 at 3:30:00 PM Central European Standard Time
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Apr 15, 2024
New Physics searches in fundamental constants
Cedric Delaunay (LAPTH)
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Start:
Monday, April 15, 2024 at 2:00:00 PM Central European Summer Time
End:
Monday, April 15, 2024 at 3:30:00 PM Central European Summer Time
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Apr 22, 2024
Search for New Physics with invisible particles in Belle II
Jacopo Cerasoli (Université de Strasbourg, CNRS, IPHC, UMR 7178, 67037 Strasbourg, France)
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Description :

The B+ -> K+ nu nu decay is mediated by a flavor-changing neutral current, which makes this decay quite rare in the Standard Model, happening about 6 times every million B+ decays, according to the theory. Moreover, the presence of two undetected neutrinos in the final state and of only one visible charged track makes searching for this decay particularly challenging. 

We perform an analysis using electron-positron collisions recorded by the Belle II experiment between the years 2019 and 2022, using the properties of the accompanying B meson in the event to suppress background from other decays of the signal B candidate and light-quark pair production. We determine the branching fraction of the decay to be 2.7 sigma above the Standard Model expectation, providing the first evidence for this decay with a significance of 3.6 standard deviations.

Start:
Monday, April 22, 2024 at 2:00:00 PM Central European Summer Time
End:
Monday, April 22, 2024 at 3:30:00 PM Central European Summer Time
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May 27, 2024
De nouveaux capteurs pour la magnéto-encéphalographie
Jean-Michel Badier (INSERM)
Christian Bénar (INSERM)
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Start:
Monday, May 27, 2024 at 2:00:00 PM Central European Summer Time
End:
Monday, May 27, 2024 at 3:30:00 PM Central European Summer Time
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5 last Seminars


Feb 5, 2024
Neutrino tagging
Mathieu Perrin-Terrin (Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France)
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Description :

Neutrino tagging is a new experimental method for accelerator based neutrino experiments. The method consists in exploiting the neutrino production mechanism, the $\pi^\pm\to\mu^\pm \nu_\mu$ decay, to kinematically reconstruct the neutrino properties from the decay incoming and outgoing charged particles. The reconstruction of these particles relies on the recent progress and on-going developments in silicon particle detector technology. The method is particularly suited to study neutrino interactions at short baseline experiments and neutrino oscillations at long baseline ones with mega-ton scale natural water Cherenkov detectors.

After introducing the method, its benefits, and the sensitivity to key observables it would offer, the seminar will discuss its implementation. The discussion will start with a presentation of the recent proof-of-principle of the tagging technique, performed using the CERN NA62 experiment as a miniature tagged neutrino experiment. Then, ideas on how to implement a full scale tagged experiment will be presented in particular regarding the beam line design and the silicon pixel technology.

Start:
Monday, February 5, 2024 at 2:00:00 PM Central European Standard Time
End:
Monday, February 5, 2024 at 3:30:00 PM Central European Standard Time
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Dec 4, 2023
3rd Year PhD Student Presentations
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Start:
Monday, December 4, 2023 at 2:00:00 PM Central European Standard Time
End:
Monday, December 4, 2023 at 3:30:00 PM Central European Standard Time
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Nov 27, 2023
3rd Year PhD Student Presentations
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Start:
Monday, November 27, 2023 at 2:00:00 PM Central European Standard Time
End:
Monday, November 27, 2023 at 3:30:00 PM Central European Standard Time
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Nov 20, 2023
Physique et état du projet ITER sur l’énergie de fusion
Jean Jacquinot (conseiller scientifique auprès du directeur général d’ITER)
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Description :

Au confluent du Verdon et de la Durance, au lieudit Cadarache en plein cœur de la Provence, le projet ITER est en phase de construction par la plus grande collaboration scientifique de tous les temps. L’Europe qui offre le site français, la Chine, la Corée du sud, l’Inde, le Japon, la Russie et les Etats Unis d’Amérique construisent ensemble un réacteur de fusion thermonucléaire dont le coût avoisine 20 milliards d’Euros. ITER a une envergure comparable au CERN. En mettant en commun les ressources et le savoir de chaque partenaire, il s’agit de démonter en vraie grandeur sur terre la viabilité scientifique de l’énergie de fusion des atomes d’hydrogène, qui alimente le soleil depuis plus de 4 milliards d’année. De puissants aimants supraconducteurs confineront un plasma constitué d’un gaz d’hydrogène porté à 200 millions de degrés, température nécessaire au processus de fusion nucléaire qui doit dégager 500 millions de watts. On abordera tout d’abord l’état de construction du projet qui a dépassé 75% de ce qui est nécessaire pour les premières expériences puis viendra la physique, complexe, innovante et fascinante, qui gouverne le confinement par le champ magnétique de ce plasma placé très largement hors de l’équilibre thermodynamique. Il se trouve être le siège de processus collectifs qui défient l’intuition.

Start:
Monday, November 20, 2023 at 2:00:00 PM Central European Standard Time
End:
Monday, November 20, 2023 at 3:30:00 PM Central European Standard Time
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Nov 6, 2023
3rd Year PhD Student Presentations
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Start:
Monday, November 6, 2023 at 2:00:00 PM Central European Standard Time
End:
Monday, November 6, 2023 at 3:30:00 PM Central European Standard Time
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