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Mårten Bertenstam (Lund University)17/09/2026, 16:00
The mechanism behind the observed baryon asymmetry in the Universe remains an open problem that motivates the search for physics beyond the Standard Model. Indeed, within the Standard Model, the smooth crossover electroweak phase transition does not provide the required departure from thermal equilibrium, nor is there a sufficient amount of CP-violation.
In this talk, I will present our...
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Philipp Rincke (Uppsala University (SE))17/09/2026, 16:15
ATLAS has recently published a new search for non-resonant $pp\to HH$ production, using Run 3 data from 2022 and 2023, combined with the full Run 2 dataset.
This analysis targets the $b\bar{b}\tau^{+}\tau^{-}$ final state.The observed Higgs boson pair production signal strength is $2.6^{+1.4}_{-1.0}$, which corresponds to an observed significance of 2.6$\sigma$, compared to an expected...
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Lara Calic (Lund University (SE))17/09/2026, 16:30
Hadronically decaying tau leptons are reconstructed as narrow jets, and quark or gluon-initiated jets that are misidentified as hadronic taus are a dominant background in searches with hadronic tau final states. Since the misidentification probability depends on the least well-modelled aspects of the simulation (soft fragmentation) and this background can't be taken from Monte Carlo and must...
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Nils Hermansson Truedsson17/09/2026, 16:45
Many low-energy precision tests of hadronic observables in the Standard Model now require the inclusion of isospin-breaking corrections due to light-quark mass differences and electromagnetism (QED). Isospin breaking typically appears for any prediction with better than percent-level precision, such as for the neutron beta decay. Lattice quantum field theory is a first-principles approach to...
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Anca Preda (Lund University)17/09/2026, 17:00
Higher-dimensional gauge theories provide a compelling framework for physics beyond the Standard Model, offering new approaches to gauge unification and ultraviolet (UV) completions. In particular, five dimensional (5D) theories compactified on orbifolds can generate realistic four dimensional (4D) models through boundary conditions, while asymptotically safe dynamics may render them UV...
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Alejandro Pierola Cervantes17/09/2026, 17:15
We present the explicit construction of a minimal, stable example of an asymptotic Grand Unified Theory (aGUT). We start by formulating the theory in the high energy regime and performing a series of checks to understand its low energy limit. The model, based on an SU(6) gauge group, and formulated in five spacetime dimensions, is compactified on an...
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Charlie Cresswell-Hogg17/09/2026, 17:30
Four-fermion interactions are important in many areas of particle physics, from effective descriptions of weak interactions and QCD to parametrisations of new physics in frameworks such as SMEFT. In this talk I demonstrate that four-fermion interactions may develop strongly coupled UV fixed points in four dimensional QFTs, becoming non-perturbatively renormalisable, and UV-completing...
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Jacob Persson (Uppsala universitet)17/09/2026, 17:45
Recent research suggests that neutron fluctuations in combination with feedback effects might have a non-negligible impact on the neutron distribution in nuclear reactors. This phenomenon can be analysed with statistical physics by using methods from quantum field theory. In this presentation, I will give an overview of previous research and our plan for how to improve the theoretical model....
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