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GGI Tea Breaks' Seminars Report of Contributions GGI Tea Breaks’ Seminars Report of Contributions https://agenda.infn.it/e/26354 GGI Tea Breaks’ … / Report of Contributions Theory Colloquium ”Portals to the… Contribution ID: 1 Type: not specified Theory Colloquium ”Portals to the Dark Sector” Wednesday, 24 March 2021 17:00 (1h 30m) A handful of open questions, such as the nature of the cosmic dark matter, compel the search for a new paradigm of matter and forces. A novel, yet plausible, element of this framework maybea hidden or dark sector of new elementary particles, which does not experience the familiar strong and electroweak interactions. Such a hidden world may still influence our visible world if there is a very weak interaction, or portal, between the two sectors. I will introduce the basic theoretical framework of dark sectors and portals and highlight the growing experimental program to search for a variety of novel phenomena associated with these theories. Presenter: BATELL, Brian (University of Pittsburgh) September 26, 2021 Page 1 GGI Tea Breaks’ … / Report of Contributions Theory Colloquium ”How to test q… Contribution ID: 2 Type: not specified Theory Colloquium ”How to test quantum theory with thought experiments” Wednesday, 14 April 2021 17:00 (1h 30m) Quantum theory is one of our most accurate theories ever when it comes to the description of small systems. It is therefore often assumed that the theory can equally well be applied to large objects, sometimes even astronomical ones like black holes. In my talk I will present a thought experiment that indicates that the range of validity of (current) quantum theory may be limited to small systems. (The talk is based on work with Daniela Frauchiger and Nuriya Nurgalieva.) Presenter: RENNER, Renato (ETH Zurich) September 26, 2021 Page 2 GGI Tea Breaks’ … / Report of Contributions Theory Colloquium ”Muon g-2: th… Contribution ID: 3 Type: not specified Theory Colloquium ”Muon g-2: the showdown” Wednesday, 21 April 2021 17:00 (1h 30m) The Muon g-2 experiment at Fermilab has recently confirmed Brookhaven’s earlier measurement of the muon anomalous magnetic moment aμ. This new result increases the discrepancy Δaμ with the Standard Model (SM) prediction and strengthens its “new physics” interpretation as well as the quest for its underlying origin. In this talk I will review the SM prediction of the muon g-2, focusing on some of the latest developments, and discuss the connection of the discrepancy Δaμ to precision electroweak predictions via their common dependence on hadronic vacuum polarization effects. Presenter: PASSERA, Massimo (INFN Padova) September 26, 2021 Page 3 GGI Tea Breaks’ … / Report of Contributions Theory Colloquium ”Galactic Arch … Contribution ID: 4 Type: not specified Theory Colloquium ”Galactic Archaeology and the Search for Dark Matter” Wednesday, 28 April 2021 18:00 (1h 30m) The Gaia mission is in the process of mapping nearly 1% of the Milky Way’s stars, nearly abillion in total. This data set is unprecedented and provides a unique view into the formation historyof our Galaxy and its associated dark matter halo. I will review recent results demonstrating howthe evolution of the Galaxy can be deciphered from the stellar remnants of massive satellite galaxies that merged with the Milky Way early on. This analysis is an inherently “big data” problem, and I will discuss how to leverage machine learning techniques to advance our understanding of the Galaxy’s evolution. Our results indicate that the local dark matter is not in equilibrium, as typi- cally assumed, and instead exhibits distinctive dynamics tied to the disruption of satellite galaxies. The updated dark matter map built from the Gaia data has ramifications for direct detection exper- iments, which search for the interactions of these particles in terrestrial targets. Presenter: LISANTI, Mariangela (Princeton) September 26, 2021 Page 4 GGI Tea Breaks’ … / Report of Contributions Theory Colloquium ”Flavor Physic … Contribution ID: 5 Type: not specified Theory Colloquium ”Flavor Physics: Status and Prospects” Wednesday, 5 May 2021 17:00 (1h 30m) Measurements of rare flavor changing transitions with either quarks or leptons can beusedto search for signs of new physics. I will review the status of the field, including the recent anomalies in B physics and anomalous magnetic moment of the muon. I will try to give sense of where the field is going next, driven in a large extent with several ambitious experimental programs coming on line in the near to midterm future (the LHCb upgrade, Belle II, Mu2e, MEG-II, etc). Presenter: ZUPAN, Jure (U. of Cincinnati) September 26, 2021 Page 5 GGI Tea Breaks’ … / Report of Contributions Focus Meeting ”Naturalness and t … Contribution ID: 6 Type: not specified Focus Meeting ”Naturalness and the future of High Energy Physics” Wednesday, 19 May 2021 17:00 (1h 30m) Naturalness arguments have been a powerful guiding principle for physicists as they try to con- struct new theories. While considerations based on simplicity and elegance have characterized the scientific thought since very early times, numerical naturalness, as most clearly formulated by’t Hooft and Wilson, has been especially influential in the search for theories of fundamental interac- tions. When applied to our current description of the microscopic world in terms of quantum field theory, it leads to the apparent paradox of the smallness of the electroweak scale and of the cosmo- logical constant as compared to the Planck scale. In this Focus Meeting, Gian Francesco Giudice and Riccardo Rattazzi will review the concept of naturalness and its implications. The seemingly convincing notions of naturalness and simplicity in Effective Field Theory will be introduced and argued that they appear mutually contradictory in both the SM and its natural extensions. This state of things defines the Hierarchy Paradox. The hypotheses on which the naturalness principle rests, the consequences of relaxing some of these hypotheses, and the current attempts to develop new paradigms beyond naturalness will then be discussed. Presenters: GIUDICE, Gian (CERN); RATTAZZI, Riccardo (EPFL) September 26, 2021 Page 6 GGI Tea Breaks’ … / Report of Contributions Focus Meeting ”The Precision Leg … Contribution ID: 7 Type: not specified Focus Meeting ”The Precision Legacy of the (HL-)LHC” Wednesday, 9 June 2021 17:00 (1h 30m) The data collected at the LHC and its High-Luminosity successor over the next 20 years willenable a multitude of precise experimental measurements in the Electroweak, Higgs and Top sectors, potentially leading to a systematic program of exploration at the frontier of fundamental physics. The design of this program and its exploitation requires multiple forms of theoretical input, ranging from the definition of the target measurements and their implications on putative newphysics scenarios to the development of sufficiently accurate and easily available theoretical predictions as well as of novel analysis data techniques that will be needed to deal with the amazing richness and complexity of the LHC data. In this Focus Meeting, Fabio Maltoni and Andrea Wulzer will review the current status of the field and give a perspective on the future challenges. Presenters: WULZER, Andrea (CERN & EPFL, Padova U.); MALTONI, Fabio (Bologna U.) September 26, 2021 Page 7 GGI Tea Breaks’ … / Report of Contributions Theory Colloquium ”Artificial Inte … Contribution ID: 8 Type: not specified Theory Colloquium ”Artificial Intelligence and Fundamental Interactions” Wednesday, 30 June 2021 17:00 (1h 30m) In this talk, I explain how various concepts and techniques in quantum field theory and collider physics can be naturally translated into a new geometric language. Using the energy mover’s distance, which quantifies the minimal amount of “work” required to rearrange one event into another, we can define a distance between pairs of collider events. This distance can thenbeused to triangulate the “space” of collider events and rigorously define various geometric objects. Many well-known collider observables, jet algorithms, and pileup mitigation schemes have a simple geo- metric interpretation, as does the important concept of infrared and collinear safety. Intriguingly, these ideas can be lifted from a distance between events into a distance between theories, with potential relevance for visualizing and interpreting data from the LHC. Presenter: THALER, Jesse (MIT) September 26, 2021 Page 8 GGI Tea Breaks’ … / Report of Contributions Theory Colloquium ”What are T-… Contribution ID: 10 Type: not specified Theory Colloquium ”What are T-Tbar deformations?” Wednesday, 20 January 2021 17:00 (1h 30m) The presence of an irrelevant field in a quantum field theory is usually not good news, asfar understanding the high-energy physics of the model is concerned. In two space-time dimensions, the T-Tbar deformation is solvable. We can describe physical observables of interest, such as the S- matrix and the finite-volume spectrum, in terms of the corresponding undeformed quantities. For this irrelevant perturbation, we can reverse the renormalization group trajectory and gain exact information about ultraviolet physics. The outcome is stunning: low-energy physics resembles that of a conventional local quantum field theory while at high-energy the density of states ona cylinder shows Hagedorn growth similar to that of a string theory. Presenter: TATEO, Roberto (TO) September 26, 2021 Page 9 GGI Tea Breaks’ … / Report of Contributions Theory Colloquium ”Is the ΛCDM … Contribution ID:
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