Next Seminars


Jun 3, 2024
Pevatrons with CTAO: Study of the Boomerang SNR in the LST-1 era
Gabriel Emery (CPPM)
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Description :

The quest for PeVatrons, sources of galactic cosmic rays accelerated up to PeV energies, saw an exciting development in the last years, thanks to the many gamma-ray sources detected by ground array experiments at energy above 100 TeV. Among those sources, the supernova remnant SNR G106.3+2.7 (including the Boomerang PWN) is a promising PeVatron candidate for which the ultra-high energy emission can be explained with both hadronic and leptonic emission scenarios. It was detected with a very high significance detection above 100 TeV by LHAASO, making it a candidate for the emission of PeV protons.
Imaging Atmospheric Cherenkov Telescopes (IACTs) are ideal instruments to investigate the nature of the most energetic sources of the Universe in gamma-ray astronomy thanks to their optimal angular and energy resolution. The Cherenkov Telescope Array Observatory (CTAO) will be the leading instrument for observations between tens of GeV and hundreds of TeV thanks to an hybrid array of IACTs. It will allow for high resolution observation of the TeV sky in a complementary energy range with LHAASO. Using the LST-1, the Large-Sized Telescope prototype of the Cherenkov Telescope Array Observatory, together with the two neighbors IACTs of the MAGIC experiment, we are currently observing the SNR G106.3+2.7 at Large Zenith Angle (LZA), which allows us to explore the 1-50 TeV region of the energy spectrum.
I will give an overview of the CTAO and its first telescope, the LST-1. Then I will describe the status of the knowledge on galactic PeVatrons and present the work lead by CPPM on the observation of the SNR G106.3+2.7 with LST-1 and MAGIC.

Start:
Monday, June 3, 2024 at 2:00:00 PM Central European Summer Time
End:
Monday, June 3, 2024 at 3:30:00 PM Central European Summer Time
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Jun 10, 2024
Expected performance of the ATLAS Phase II Inner Tracker
Thomas Strebler (CPPM, Aix-Marseille Université, CNRS/IN2P3 (FR))
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The upgrade to the High-Luminosity LHC (HL-LHC), with its increase to 140-200 proton-proton collisions per bunch crossing, poses formidable challenges for track reconstruction. The Inner Tracker (ITk) is a silicon-only replacement of the current ATLAS tracking system as part of its Phase-II upgrade, designed to meet the challenges and continue to deliver high-performance track reconstruction. This seminar will give an overview of the expected performance of tracking and its impact on higher level objects. The ITk most recent layout optimisation and developments, and their impact on tracking performance, will also be reviewed.
 
Start:
Monday, June 10, 2024 at 2:00:00 PM Central European Summer Time
End:
Monday, June 10, 2024 at 3:30:00 PM Central European Summer Time
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Jun 17, 2024
L'ITK-Pixels, le nouveau détecteur à pixels d'ATLAS pour HL-LHC
Eric Vigeolas (CPPM)
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Start:
Monday, June 17, 2024 at 2:00:00 PM Central European Summer Time
End:
Monday, June 17, 2024 at 3:30:00 PM Central European Summer Time
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Jul 1, 2024
TBD (Belle II)
Valerio Bertacchi (Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France)
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TBD

Start:
Monday, July 1, 2024 at 2:00:00 PM Central European Summer Time
End:
Monday, July 1, 2024 at 3:30:00 PM Central European Summer Time
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Oct 7, 2024
Physics at ISOLDE
Sean Freeman (CERN/The University of Manchester)
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Start:
Monday, October 7, 2024 at 2:00:00 PM Central European Summer Time
End:
Monday, October 7, 2024 at 3:30:00 PM Central European Summer Time
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5 last Seminars


May 27, 2024
Optically Pumped Magnetometers for recording brain activity with high spatial and temporal resolution
Jean-Michel Badier (INSERM)
Christian Bénar (INSERM)
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Description :

Magnetoencephalography (MEG) and electroencephalography (EEG) is electrophysiological techniques for recording brain activity at its time-scale of function, i.e., at the millisecond level. An inverse problem can be applied to EEG and MEG in order to estimate the actual location of sources within the brain from the surface measurements. Contrary to EEG, MEG is little influenced by the low electrical conductivity of the skull, which severely blurs EEG electrical fields. In practice, this leads to better spatial capacities for MEG. MEG is used in presurgical evaluation of epilepsy and in fundamental neuroscience.

Classical MEG sensors (SQUIDs) relies on supraconductivity, which is a heavy constraint. Recently, new sensors have been developed for MEG, the Optically Pumped magnetometers. In this talk, we will review the potential capacities of these new sensors and show initial results of combined recordings of OPM and intracerebral EEG performed at the INS. We will also present the industrial chair project NewMeg funded by Amidex.

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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May 6, 2024
Status of the Euclid mission in flight
William Gillard (CPPM - Université Aix-Marseille)
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Description :

Euclid is an ESA mission aiming at studying the geometry and nature of the dark Universe. Over a span of six years, Euclid will meticulously survey nearly 15,000 square degrees of the extragalactic sky. Equipped with optical capabilities spanning from 530 to 920 nanometers and near-infrared imaging in Y, J, and H bands, as well as slitless spectroscopy ranging from 1206 to 1892 nanometers, Euclid will capture detailed data on distant galaxies between redshift of 0.84 and 2. Launched successfully on July 1, 2023, Euclid was placed in orbit around the second Lagrange point where both of its cutting-edge instruments, the VIS and the NISP, underwent meticulous commissioning and calibration over the initial six months of the mission. As the Euclid survey commenced in February 2024, this presentation will provide insights into the mission's status at Lagrange 2 and showcase the initial scientific images and results captured by both instruments.

Start:
Monday, May 6, 2024 at 2:00:00 PM Central European Summer Time
End:
Monday, May 6, 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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Apr 15, 2024
New Physics Searches from Below
Cedric Delaunay (LAPTH)
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Description :
The Standard Model successfully describes the fundamental interactions of elementary particles up to TeV energies. Nonetheless, we know there is new physics beyond, although the energy scale at which it becomes manifest is unknown. The common belief is that new phenomena arise only at TeV energies or higher. However, much lighter particles could still be hiding due to their very weak interactions with known ones. Ultra-high precision measurements in atomic and molecular spectroscopy offer an interesting set of probes for such scenarios, complementing the efforts invested at high-energy colliders. In this presentation, we will explore two different approaches based on hydrogen spectroscopy and atomic clocks.
Document to collect questions:
https://docs.google.com/document/d/1_NEaFIEQfeKQCADn3IKZEznWSi6OYO5WGSslyQbe5-A/edit
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 10, 2024
Status and Prospects of the JUNO Neutrino Experiment
Yifang Wang (IHEP Beijing and Chinese Academy of Science)
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Description :

The JUNO experiment located at Jiangmen in the south of China nearby Macau is primarily a reactor neutrino experiment at a baseline of 53 km. With a total target mass of 20 kt liquid scintillator, it can measure precisely the reactor neutrino spectrum to determine the mass hierarchy and to improve the precision of neutrino mixing parameters by an order of magnitude. It is one of the best experiment for supernova neutrinos, solar neutrinos and geoneutrinos, as well as searches for new physics. In this talk, I will report the design, the technology development and the construction status of the detector. Data taking of the JUNO experiment is expected to be around the end of this year. Possible upgrades in the future will be also discussed.

Wang Yifang is a Chinese particle and accelerator physicist. He is director of the Institute of High Energy Physics (IHEP) of the Chinese Academy of Sciences in Beijing and known for contributions to neutrino physics, in particular his leading role (with Kam-Biu Luk) at Daya Bay Reactor Neutrino Experiment to determine the last unknown neutrino mixing angle θ 13.
After earning his bachelor's degree in physics at Nanjing University (1984) he was with Samuel CC Ting at the L3 experiment the Large Electron-Positron Collider (LEP) of CERN. Wang worked and studied at the University of Florence obtaining PhD in Physics, then worked at Laboratory for Nuclear Science of the Massachusetts Institute of Technology and at Stanford University and joined the Institute of High Energy Physics(IHEP), China in 2001 as a researcher and became the Director in 2011.

Start:
Wednesday, April 10, 2024 at 11:00:00 AM Central European Summer Time
End:
Wednesday, April 10, 2024 at 12:30:00 PM Central European Summer Time
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