The IFIC ATLAS group has been one of the main contributors to the recently released results of the Higgs boson measurements in the H->tautau channel using the Run-2 dataset (arXiv:2407.16320). This new analysis includes a significant extension of the measurements in the Simplified Template Cross-Section (STXS) framework for VBF and ttH production. Furthermore, the first ATLAS H->tautau...
The International Linear Collider (ILC) will allow the precise study of $e^{+}e^{-}\rightarrow q\bar{q}$ interactions at different center-of-mass energies from the $Z$-pole to 1 TeV.
In this paper, we discuss the experimental prospects for measuring differential observables in $e^{+}e^{-}\rightarrow b\bar{b}$ and $e^{+}e^{-}\rightarrow c\bar{c}$ at the ILC baseline energies, 250 and 500 GeV....
The recent measurements of the Large Hadron Collider and legacy results from previous colliders allow to probe the couplings of the top quark in the context of Effective Field Theories (EFT), such as the Standard Model EFT (SMEFT). We present the results of a global SMEFT fit including those recent experimental results. We show that LHC Run 2 data allow, for the first time, to overconstrain...
In models with extended scalar sectors consisting of multiple Higgs doublets that trigger spontaneous electroweak symmetry breaking, it might be expected that the abundance of dimensionful quadratic couplings in the scalar potential could allow for a regime where, apart from the would-be Goldstone bosons and a neutral Higgs-like state, all new scalars have masses much larger than the...
A combination of searches for non-resonant Higgs boson pair production in the $b\bar{b}b\bar{b}$, $b\bar{b}\gamma\gamma$, $b\bar{b}\tau^{+}\tau^{-}$ final states with the ATLAS detector provides constraints on the Standard Model prediction. Current analyses at $\sqrt{s} = 13 \, \text{TeV}$ with 126–140 $\text{fb}^{-1}$ of data set a 95% CL upper limit of 2.9 times the Standard Model prediction...
Previously in ATLAS a likelihood approach has been used for prompt electron identification against different possible backgrounds.
Over the last few years, great efforts have been made in order to develop a versatile, powerful and reliable deep neural network (DNN) that is able to perform a multinomial classification of electrons according to different pre-defined classes. Once this machine...
This review presents the current experimental evidence for the scale dependence of the parameters of the QCD Lagrangian. Ample evidence over a broad range of energy scales exists for the running of the strong coupling. I will review studies into the scale evolution of quark masses in more detail, with particular emphasis on the bottom quark, where Higgs data has helped to raise evidence for...
The Large Hadron Collider (LHC) is currently in its third and final run, exceeding its design luminosity and producing an unprecedented amount of
high-precision data. The remarkable accuracy of these measurements demands equally precise theoretical predictions to fully exploit the LHC's potential for new discoveries and precise characterization of the
Standard Model. The pursuit of...
We present a measurement of the top quark pole mass, based on a method developed at IFIC where the mass is determined from the normalized differential cross section for associated production of a top quark pair with an energetic jet. The new result is based on the di-lepton channel, using 140/fb of pp collision data at sqrt(s) = 13 TeV, collected by the ATLAS experiment in run 2 of the Large...
After the discovery of the Higgs boson in 2012 by the ATLAS and CMS Collaborations, a new era for particle physics and cosmology opened up. One of its most intriguing properties, the Higgs boson self-coupling, with implications on the vacuum stability of the universe, remains unobserved. The improvement of the trigger selections and machine learning techniques are of paramount importance to...
