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Large charge meets semiclassics in super Yang-Mills
No full textWe study the large-charge sector of super Yang-Mills theory (SYM) with gauge group by constructing a special class of half-BPS heavy operators, termed "canonical operators". Such operators exhibit remarkable simplicity in the large-charge 't Hooft limit, where the dimension of the operators with held finite. Canonical operator insertions in this regime map SYM onto the Coulomb branch, by assigning a classical profile to the scalar fields with non-vanishing values along the diagonals given by the roots of unity. We follow a semiclassical approach to study two-point, three-point and Heavy-Heavy-Light-Light (HHLL) correlators. In particular we show that HHLL correlators in the large-charge 't Hooft limit are computed as two-point functions in a background determined by the classical profiles. We provide consistent evidence of our findings by computing the same observables via supersymmetric localization
Visit by Dr Stephen K. Streiffer, Director, Oak Ridge National Laboratory, USA
No full textVisit by Dr Stephen K. Streiffer, Director, Oak Ridge National Laboratory, United States of Americ
Highlights on associated top quark production and searches for new top-quark phenomena with the ATLAS detector
No full textThe high center-of-mass energy of proton-proton collisions and the large datasets collected at the CERN Large Hadron Collider (LHC) offer a unique opportunity to study rare processes within the Standard Model (SM) with unprecedented precision. These studies also enable searches for new physics that may influence or enhance these rare SM processes. Measuring rare SM processes not only provides rigorous tests of SM predictions but can also reveal potential discrepancies or offer critical input for refining theoretical models. This contribution presents the latest highlights from the ATLAS top quark physics program
Fast Jet Finding in Julia
No full textJet reconstruction remains a critical task in the analysis of data from HEP colliders. We describe in this paper a new, highly performant, Julia package for jet reconstruction, JetReconstruction.jl, which integrates into the growing ecosystem of Julia packages for HEP. With this package users can run sequential reconstruction algorithms for jets. In particular, for LHC events, the Anti-, Cambridge/Aachen and Inclusive- algorithms can be used. For FCCee studies the use of alternative algorithms such as the Generalised for and Durham are also supported. The performance of the core algorithms is better than Fastjet's C++ implementation, for typical LHC and FCCee events, thanks to the Julia compiler's exploitation of single-instruction-multiple-data (SIMD), as well as ergonomic compact data layouts. The full reconstruction history is made available, allowing inclusive and exclusive jets to be retrieved. The package also provides the means to visualise the reconstruction. Substructure algorithms have been added that allow advanced analysis techniques to be employed. The package can read event data from EDM4hep files and reconstruct jets from these directly, opening the door to FCCee and other future collider studies in Julia
An Introduction to Topological Quantum Computation
No full textTopology is one of the most recent branches of mathematics and has entered fully into one of the most modern aspects of theoretical physics: quantum computation. In this colloquium an elementary approach to the role of topology in quantum physics and its implications for quantum computing is provided. Topology helps to solve the essential problem of quantum computation: to battle its fragility in order to benefit from its enormous potential possibilities. Topological color codes are discussed as an example of topological protection based on ground state properties. A review of their experimental implementations, including ion traps, superconducting qubits, and neutral atoms in optical lattices, is presented, along with an examination of future challenges.</p