A detailed map of Higgs boson interactions by the ATLAS experiment ten years after the discovery.
Nature 607:7917 (2022) 52-59
Abstract:
The standard model of particle physics1-4 describes the known fundamental particles and forces that make up our Universe, with the exception of gravity. One of the central features of the standard model is a field that permeates all of space and interacts with fundamental particles5-9. The quantum excitation of this field, known as the Higgs field, manifests itself as the Higgs boson, the only fundamental particle with no spin. In 2012, a particle with properties consistent with the Higgs boson of the standard model was observed by the ATLAS and CMS experiments at the Large Hadron Collider at CERN10,11. Since then, more than 30 times as many Higgs bosons have been recorded by the ATLAS experiment, enabling much more precise measurements and new tests of the theory. Here, on the basis of this larger dataset, we combine an unprecedented number of production and decay processes of the Higgs boson to scrutinize its interactions with elementary particles. Interactions with gluons, photons, and W and Z bosons-the carriers of the strong, electromagnetic and weak forces-are studied in detail. Interactions with three third-generation matter particles (bottom (b) and top (t) quarks, and tau leptons (τ)) are well measured and indications of interactions with a second-generation particle (muons, μ) are emerging. These tests reveal that the Higgs boson discovered ten years ago is remarkably consistent with the predictions of the theory and provide stringent constraints on many models of new phenomena beyond the standard model.A search for an unexpected asymmetry in the production of e + μ − and e − μ + pairs in proton–proton collisions recorded by the ATLAS detector at s = 13 TeV
Physics Letters B Elsevier 830 (2022) 137106
Authors:
G Aad, B Abbott, DC Abbott, A Abed Abud, K Abeling, DK Abhayasinghe, SH Abidi, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, AC Abusleme Hoffman, BS Acharya, B Achkar, L Adam, C Adam Bourdarios, L Adamczyk, L Adamek, SV Addepalli, J Adelman, A Adiguzel, S Adorni, T Adye, AA Affolder, Y Afik, C Agapopoulou, MN Agaras, J Agarwala, A Aggarwal, C Agheorghiesei, JA Aguilar-Saavedra, A Ahmad, F Ahmadov, WS Ahmed, X Ai, G Aielli, I Aizenberg, S Akatsuka, M Akbiyik, TPA Åkesson, AV Akimov, K Al Khoury, GL Alberghi, J Albert, P Albicocco, MJ Alconada Verzini, S Alderweireldt, M Aleksa, IN Aleksandrov, C Alexa, T Alexopoulos, A Alfonsi, F Alfonsi, M Alhroob, B Ali, S Ali, M Aliev, G Alimonti, C Allaire, BMM Allbrooke, PP Allport, A Aloisio, F Alonso, C Alpigiani, E Alunno Camelia, M Alvarez Estevez, MG Alviggi, Y Amaral Coutinho, A Ambler, L Ambroz, C Amelung, D Amidei, SP Amor Dos Santos, S Amoroso, KR Amos, CS Amrouche, V Ananiev, C Anastopoulos, N Andari, T Andeen, JK Anders, SY Andrean, A 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S Zenz, S Zerradi, D Zerwas, B Zhang, DF Zhang, G Zhang, J Zhang, K Zhang, L Zhang, M Zhang, R Zhang, S Zhang, X Zhang, X Zhang, Z Zhang, P Zhao, T Zhao, Y Zhao, Z Zhao, A Zhemchugov, Z Zheng, D Zhong, B Zhou, C Zhou, H Zhou, N Zhou, Y Zhou, CG Zhu, C Zhu, HL Zhu, H Zhu, J Zhu, Y Zhu, X Zhuang, K Zhukov, V Zhulanov, D Zieminska, NI Zimine, S Zimmermann, J Zinsser, M Ziolkowski, L Živković, A Zoccoli, K Zoch, TG Zorbas, O Zormpa, W Zou, L ZwalinskiA detailed map of Higgs boson interactions by the ATLAS experiment ten years after the discovery
ArXiv 2207.00092 (2022)
Measurements of $W^{+}W^{-}$ production in decay topologies inspired by searches for electroweak supersymmetry
ArXiv 2206.15231 (2022)
Leveraging universality of jet taggers through transfer learning
The European Physical Journal C volume 82, Article number: 564 (2022)
Authors:
Frédéric A. Dreyer, Radosław Grabarczyk, Pier Francesco Monni
Abstract:
A significant challenge in the tagging of boosted objects via machine-learning technology is the prohibitive computational cost associated with training sophisticated models. Nevertheless, the universality of QCD suggests that a large amount of the information learnt in the training is common to different physical signals and experimental setups. In this article, we explore the use of transfer learning techniques to develop fast and data-efficient jet taggers that leverage such universality. We consider the graph neural networks LundNet and ParticleNet, and introduce two prescriptions to transfer an existing tagger into a new signal based either on fine-tuning all the weights of a model or alternatively on freezing a fraction of them. In the case of W-boson and top-quark tagging, we find that one can obtain reliable taggers using an order of magnitude less data with a corresponding speed-up of the training process. Moreover, while keeping the size of the training data set fixed, we observe a speed-up of the training by up to a factor of three. This offers a promising avenue to facilitate the use of such tools in collider physics experiments.