LHC Paper Reviews – Détails, épisodes et analyse

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LHC Paper Reviews

Angel Walker

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Fréquence : 1 épisode/5j. Total Éps: 17

Go beyond the headlines and dive into the real science of the Large Hadron Collider. Each episode, your AI particle physicists Bob and Alice break down the latest, most significant papers from the LHC experiments at CERN. From new measurements of the Higgs boson to the ongoing search for physics beyond the Standard Model, this podcast offers a clear, expert review of cutting-edge research's data, methods, and implications. Perfect for physics students, researchers, and anyone who wants to understand the universe at its most fundamental level.

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Higgs Boson Measurements and SMEFT Constraints with the CMS Experiment

jeudi 28 août 2025 • Durée 19:30

The CMS Experiment has unveiled its most precise and comprehensive measurement of the Higgs boson to date, utilising LHC Run 2 data collected between 2016 and 2018. This significant legacy combination of Higgs boson studies confirms theories regarding the origin of mass in the Universe with a 5% precision for its production rate. Scientists achieved this by statistically combining measurements from all accessible Higgs boson decay channels and production modes. Furthermore, the experiment employed Simplified Template Cross Sections (STXS) to map the Higgs boson's behaviour across 32 distinct categories, and interpreted these findings using Standard Model Effective Field Theory (SMEFT) to search for new physics in a model-independent way, examining 43 different SMEFT interactions. While largely confirming the Standard Model, the results also show intriguing small deviations in high-momentum regions, which could hint at physics beyond the current understanding.

Links:

- https://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/HIG-21-018/index.html

- https://cms.cern/news/pieces-precision-building-higgs-bosons-clearest-portrait-date

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ATLAS Jet Flavor Tagging with AI: The GN2 Algorithm

vendredi 22 août 2025 • Durée 13:50

he ATLAS Experiment at CERN has embraced modern AI techniques to revolutionise jet flavour tagging, a crucial process in analysing particle collisions. A new algorithm called GN2, powered by a Transformer neural network, directly analyses information from particle tracks and jets, eliminating the need for previous, hand-crafted algorithms. This advancement significantly improves the identification of b-jets and c-jets, which are vital for Standard Model measurements and the search for new physics phenomena. The ATLAS Collaboration has established robust pipelines to integrate and train these AI algorithms, leading to a substantial leap in performance and offering deeper insights into the physics signatures learned by the model. This innovative approach is already having a significant impact on ATLAS physics research, including enhancing the precision of Higgs boson studies and the search for new particles.

Paper link: https://arxiv.org/pdf/2505.19689

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Supersymmetry Search at CMS Experiment: Boosted Objects and Razor Variables

jeudi 7 août 2025 • Durée 12:50

The CMS Collaboration's "An all-round boosted chase for supersymmetry" explores the concept of supersymmetry (SUSY), a theoretical extension of the Standard Model of particle physics. The article details how scientists at CERN's CMS Experiment are searching for superparticles by analysing final states that include Lorentz-boosted objects, which are formed when heavy superparticles decay into lighter, high-momentum particles. This new "razor boost" analysis broadens the search to 25 distinct final states, including boosted W, Z, Higgs bosons, top quarks, and uniquely, boosted leptonic jets, using machine learning and razor kinematic variables to identify potential SUSY signals. Although no significant deviations from Standard Model predictions were observed, the findings have allowed the collaboration to set strong limits on superparticle production rates and masses within various SUSY models, with further interpretations of complete SUSY models ongoing.

Links: https://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/SUS-23-014/index.html

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Jet Intercalibration at the ATLAS Experiment: Uncertainty and Consistency Evaluation

mardi 29 juillet 2025 • Durée 14:22

The current episode discusses a research paper from the ATLAS Collaboration concerning the evaluation of statistical uncertainties in the jet η-intercalibration method for the ATLAS experiment at CERN's Large Hadron Collider. The paper, identified as ATL-PHYS-PUB-2025-027, explains a new approach utilising the bootstrap method to determine calibration factor uncertainties and their correlations more accurately. This innovative technique is compared against previous methods, with figures illustrating distributions, uncertainty ratios, and correlation matrices. Additionally, the paper introduces a method for quantifying the statistical compatibility of jet observables within the calibration procedure, employing a pull statistic to assess robustness.

Links: https://cds.cern.ch/record/2935135/files/ATL-PHYS-PUB-2025-027.pdf

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Sharper Sight for Electron-Positron Pairs at the CMS Experiment

lundi 21 juillet 2025 • Durée 19:22

In this episode, we discuss the details of the CMS experiment's innovative advancement in particle detection, specifically focusing on its enhanced ability to identify highly collimated electron-positron pairs. Previously, the CMS detector struggled to differentiate these pairs when they travelled too closely, often registering them as a single particle. To overcome this, the CMS Collaboration developed a new machine learning-based technique that significantly improves the detector's resolution, enabling it to distinguish pairs with extremely small angular separations. The text explains how this new method has been rigorously tested and validated using both simulations and real-world data, confirming its efficacy in energy measurement and consistency. This improved capability will allow CMS to conduct more precise searches for new phenomena beyond the Standard Model, particularly theories predicting the existence of lightweight bosons that decay into such electron-positron pairs.

Read more about it in: https://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/EGM-24-002/index.html

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Rare Higgs decays investigated by the ATLAS experiment

lundi 14 juillet 2025 • Durée 17:14

This episode details the ATLAS Collaboration's ongoing research into rare Higgs boson decays at the Large Hadron Collider (LHC), specifically focusing on decays to muons (H→μμ) and to a Z boson and a photon (H→Zγ). These studies, utilising data from LHC Run 3 (2022–2024) and combined with Run 2 (2015–2018) data, aim to test the Standard Model by precisely measuring these infrequent processes. The documents explain the experimental methods used to identify these rare events, including sophisticated data analysis techniques and event categorisation, and present the statistical significance of the observed evidence. The findings demonstrate improved sensitivity and contribute to a more comprehensive understanding of the Higgs boson's properties.

Papers:

https://arxiv.org/pdf/2507.03595

https://cds.cern.ch/record/2937635/files/ATLAS-CONF-2025-007.pdf

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Top Quarks: Unveiling Bound States at LHC

mardi 8 juillet 2025 • Durée 31:52

In this episode, we detail experimental particle physics research conducted by the ATLAS and CMS Collaborations at the Large Hadron Collider (LHC), specifically focusing on proton-proton (pp) collisions at a centre-of-mass energy of 13 TeV. Both collaborations investigate top-antitop (tt) pair production, with a particular emphasis on the kinematic threshold region where quasi-bound tt states are expected to form. The ATLAS experiment reports an observed excess of events over standard perturbative Quantum Chromodynamics (pQCD) predictions, consistent with the formation of these colour-singlet, S-wave quasi-bound tt states, and quantifies this excess with a significance of 7.7 standard deviations. The CMS experiment also notes a similar enhancement at the tt threshold and reproduces mild tension regarding spin correlation measurements, ultimately establishing the presence of a pseudoscalar excess at the tt production threshold with a significance exceeding five standard deviations. Both papers describe their detector apparatus, event reconstruction methods, background estimations, and systematic uncertainties, utilising Monte Carlo simulations to model various processes and validate their findings.

ATLAS paper: https://cds.cern.ch/record/2937636/files/ATLAS-CONF-2025-008.pdf

CMS paper: https://arxiv.org/pdf/2503.22382

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Probing the Higgs boson CP properties in vector-boson fusion production with the ATLAS detector

lundi 30 juin 2025 • Durée 24:59

This episode details an experiment conducted by the ATLAS Collaboration using Large Hadron Collider data from 2015-2018. The research investigates the CP properties of the Higgs boson in its vector-boson fusion production mode, specifically focusing on its decay into two tau leptons. Utilising the Optimal Observable method and an effective field theory framework, the study aims to detect CP-violating interactions between the Higgs boson and electroweak gauge bosons. While no deviations from the Standard Model (which predicts a CP-even Higgs boson) were observed, the analysis provides stringent limits on strength parameters that describe potential beyond-Standard Model physics. The paper compares these findings with previous ATLAS and CMS Collaboration results, contributing to the ongoing effort to understand the fundamental nature of the Higgs boson.

Link to arxiv: https://arxiv.org/abs/2506.19395

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Searching for Light Particles from Higgs Boson Decays with the CMS Experiment

mercredi 25 juin 2025 • Durée 18:09

The CMS experiment at CERN has conducted a search for light-weight hypothetical particles, specifically axion-like particles (ALPs), that may result from Higgs boson decays. These ALPs are theorised to decay into electron-positron pairs, which present a significant challenge for detection due to their merged experimental footprints. To overcome this, the CMS Collaboration developed a new multivariate identification technique using machine learning and precise tracking data. While no significant excess beyond the Standard Model was observed, the research established new stringent limits on exotic Higgs boson decays, thus providing crucial constraints on theoretical models of ALPs and demonstrating the LHC's unique capacity for exploring new physics.

CMS Physics Analysis Summary (EXO-24-031): "Search for light pseudoscalar a bosons in H→aa→4e decays in pp collisions at √s = 13 TeV"

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Shedding light with jets from the dark side with the ATLAS Experiment

mercredi 18 juin 2025 • Durée 20:56

The ATLAS Experiment at CERN is actively searching for evidence of a "dark sector," a theoretical realm of particles and forces that interact minimally with known matter, potentially explaining dark matter. Researchers are specifically investigating "dark jets," which are sprays of dark-sector particles that could partially decay into visible particles or vanish during high-energy collisions. To distinguish these elusive signals from background noise, the experiment employs advanced artificial intelligence and machine learning models to analyse vast amounts of data. Two primary search strategies are highlighted: one targeting "semi-visible jets," which exhibit missing momentum due to undetected dark particles, and another focusing on "emerging jets," where particles appear to materialise some distance from the collision point. These studies utilise sophisticated analysis techniques, including neural networks and unique trigger systems, to place exclusion limits on theoretical mediator particles that could link the Standard Model to the dark sector.

More info here: https://arxiv.org/abs/2505.02429

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LHC Paper Reviews – Détails, épisodes et analyse

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