CERN Accelerating science

Scientific Seminars and Workshops

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2023-01-30
15:11
A Celestial Matrix Model / Kar, Arjun (speaker) (University of British Columbia)
Understanding the proper formulation of AdS holography in two spacetime dimensions has led to fascinating progress in several directions.  The main novel ingredient compared to higher dimensions is that the asymptotic behavior of the metric is only "nearly'' AdS in a certain precise sense.  This difference allows for a very simple theory, Jackiw-Teitelboim gravity, to have a non-perturbative completion as a Hermitian matrix model.  In this talk, we propose analogous modifications of the flat space boundary conditions in two dimensional dilaton gravity.  These modifications allow a very simple theory, which we call Cangemi-Jackiw gravity, to have a non-perturbative completion as a random matrix model.  We will discuss the Lorentzian and Euclidean formulations of this model, challenges in computing its non-perturbative scattering matrix, and which of its lessons are potentially applicable to four-dimensional celestial holography..
2023 - 0:57:43. TH String Theory Seminar External link: Event details In : A Celestial Matrix Model

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2023-01-25
09:20
Recent ALICE results on $\psi$(2S) production / Scomparin, Enrico (speaker) (Universita e INFN Torino (IT))
Quarkonia represent a key observable for our understanding of the quark-gluon plasma (QGP) properties, and more generally for the investigation of the QCD color force in a strongly interacting environment. In heavy-ion collisions at LHC energy, significant suppression and regeneration effects were observed and analyzed in detail for the J/$\psi$. [...]
2023 - 0:50:51. LHC Seminar External link: Event details In : Recent ALICE results on $\psi$(2S) production

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2023-01-24
16:26
The use of Micro-Pattern Technologies in Micro-Pattern Gaseous Detectors / De Oliveira, Rui (speaker) (CERN)
The construction of Micro-Pattern Gaseous Detectors (MPGD) is the main focus of the Micro-Pattern Technologies (MPT) workshop at CERN. After a brief introduction to the activities of the MPT workshop, the presentation will retrace the technological developments for three different types of MPGDs that made it possible to obtain such detectors, which are now deployed on a large scale in particle physics experiments.The First example presented will be GEM detectors, where the step of going from a photoimageable polyimide, used in micro-electronics to passivate integrated circuits, to a particle detector able to operate more efficiently than wire chambers in the very harsh and challenging environment of high-energy physics experiments.The second example retraces the path followed to go from a stainless steel grid, used for screen printing of patterns on textiles or posters, to the production of MicroMegas detectors, used for example for the New Small Wheels (NSW) of the ATLAS experiment.The last example will deal with µ-Rwell detectors, a technology initially abandoned as soon as it appeared after the development of GEMs in 1998, but which is now revealing its full potential after being neglected for more than 20 years. [...]
2023 - 1:05:50. Detector Seminar External link: Event details In : The use of Micro-Pattern Technologies in Micro-Pattern Gaseous Detectors

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2023-01-24
16:26
Towards a Dynamic Production of Global Land Cover Maps / Sedona, Rocco (speaker) (Forschungszentrum Jülich)
Land cover (LC) maps are a fundamental tool in a variety of fields such as climatology, ecology and geography, as their availability is crucial for the analysis of trends and recognition of patterns of phenomena that occur on the Earth’s surface. The dense Time Series of images with a worldwide coverage provided by current satellite missions allow the dynamic production of LC maps, and several methods have been recently proposed to generate maps at country, continental or global scale. [...]
2023 - 1:01:17. EP-IT Data Science Seminars External link: Event details In : Towards a Dynamic Production of Global Land Cover Maps

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2023-01-19
09:42
Computing bulk microstates / Lee, Ji Hoon (speaker) (Perimeter Institute)
A central question in AdS/CFT is how the string degrees of freedom are organized in the dual gauge theory. In my talk, I present an exact formula that relates the BPS sectors of U(N) gauge theories and their string duals [...]
2023 - 1:24:15. TH String Theory Seminar External link: Event details In : Computing bulk microstates

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2023-01-06
09:12
The LHCb RICH Upgrade: from design to early performance / Gambetta, Silvia (speaker) (The University of Edinburgh (GB))
The first year of Run 3 has just concluded and for the LHCb experiment it has been the first chance to take data with the its brand new detectors. During LHC Long-Shutdown 2, the LHCb experiment underwent a major upgrade in order to be able to operate at the instantaneous luminosity of 2×1033cm−2s−1 and a reading data rate of 40 MHz with a fully software-based trigger. [...]
2022 - 1:12:56. Detector Seminar External link: Event details In : The LHCb RICH Upgrade: from design to early performance

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2022-12-21
12:39
Measurements of $R(K)$ and $R(K^*)$ with the full LHCb Run 1 and 2 data / Quagliani, Renato (speaker) (EPFL - Ecole Polytechnique Federale Lausanne (CH))
In this seminar we present the first simultaneous test of muon-electron universality in $B^+ \to K^+ \ell^+\ell^-$ and $B^0 \to K^{*0} \ell^+ \ell^-$ decays, known as $R(K)$ and $R(K^*)$, in two regions of di-lepton invariant mass squared.The analysis operates at a higher signal purity compared with previous analyses and implements a data-driven treatment of residual hadronic backgrounds. The analysis uses the full LHCb Run 1 and 2 data recorded in 2011-2012 and 2015-2018, corresponding to an integrated luminosity of 9 fb$^{-1}$. [...]
2022 - 1:27:30. LHC Seminar External link: Event details In : Measurements of $R(K)$ and $R(K^*)$ with the full LHCb Run 1 and 2 data

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2022-12-15
10:11
ALICE determines the transparency of our galaxy to the passage of antihelium nuclei / Šerkšnytė, Laura (speaker) (Technische Universitaet Muenchen (DE))
In the last decade, the ALICE Collaboration has measured the production of light (anti)nuclei very precisely in small and large collision systems. The most recent development in this field concerns the measurements of the momentum-dependent inelastic cross sections of antideuterons and antihelium-3 nuclei employing the ALICE detector material as a target [...]
2022 - 1:04:43. LHC Seminar External link: Event details In : ALICE determines the transparency of our galaxy to the passage of antihelium nuclei

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2022-12-15
09:59
Fundamental physics and cosmology with the Einstein Telescope / Maggiore, Michele (speaker) (Universite de Geneve (CH))
The Einstein Telescope is a proposed  third-generation gravitational wave detector, to be build in Europe in the next decade. Its sensitivity will allow us to explore the depths on the Universe with gravitational waves. [...]
2022 - 1:10:15. Theory Colloquia External link: Event details In : Fundamental physics and cosmology with the Einstein Telescope

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2022-12-14
11:44
The cosmic optical background excess, line-intensity mapping / Kamionkowski, Marc (speaker)
Recently, the New Horizons spacecraft was able to detect, for the first time, the cosmic background of optical light.  The signal was twice that expected from galaxy number counts. [...]
2022 - 1:13:35. Theory Colloquia External link: Event details In : The cosmic optical background excess, line-intensity mapping

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