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Evidence for longitudinally polarized $W$ bosons in the electroweak production of same-sign $W$ boson pairs in association with two jets in pp collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

ArXiv 2503.11317 (2025)
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Charged-hadron and identified-hadron ($K^\mathrm{0}_\mathrm{S}$, $Λ$, $Ξ^\mathrm{-}$) yield measurements in photo-nuclear Pb+Pb and $p$+Pb collisions at $\sqrt{s_\mathrm{NN}} = 5.02$ TeV with ATLAS

ArXiv 2503.08181 (2025)
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Search for Higgs boson exotic decays into Lorentz-boosted light bosons in the four-$τ$ final state at $\sqrt{s}=13$ TeV with the ATLAS detector

ArXiv 2503.05463 (2025)
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Software and computing for Run 3 of the ATLAS experiment at the LHC

European Physical Journal C Springer Nature 85:3 (2025) 234

Authors:

G Aad, E Aakvaag, B Abbott, K Abeling, Nj Abicht, Sh Abidi, M Aboelela, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, E Accion Garcia, Bs Acharya, V Acin Portella, A Ackermann, C Acosta Silva, C Adam Bourdarios, L Adamczyk, Sv Addepalli, Mj Addison, J Adelman, A Adiguzel, T Adye, Aa Affolder, Y Afik, Mn Agaras, J Agarwala, A Aggarwal, C Agheorghiesei, A Ahmad, F Ahmadov, Ws Ahmed, S Ahuja, X Ai, G Aielli, A Aikot, M Ait Tamlihat, B Aitbenchikh, M Akbiyik, Tpa Åkesson, Av Akimov, D Akiyama, Nn Akolkar, S Aktas, K Al Khoury, Gl Alberghi, J Albert, P Albicocco, Gl Albouy, S Alderweireldt

Abstract:

<jats:title>Abstract</jats:title> <jats:p>The ATLAS experiment has developed extensive software and distributed computing systems for Run 3 of the LHC. These systems are described in detail, including software infrastructure and workflows, distributed data and workload management, database infrastructure, and validation. The use of these systems to prepare the data for physics analysis and assess its quality are described, along with the software tools used for data analysis itself. An outlook for the development of these projects towards Run 4 is also provided.</jats:p>
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Differential cross-section measurements of Higgs boson production in the H → τ + τ − decay channel in pp collisions at s = 13 TeV with the ATLAS detector

Journal of High Energy Physics Springer 2025:3 (2025) 10

Authors:

G Aad, E Aakvaag, B Abbott, S Abdelhameed, K Abeling, NJ Abicht, SH Abidi, M Aboelela, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, A Ackermann, C Adam Bourdarios, L Adamczyk, SV Addepalli, MJ Addison, J Adelman, A Adiguzel, T Adye, AA Affolder, Y Afik, MN Agaras

Abstract:

Differential measurements of Higgs boson production in the τ-lepton-pair decay channel are presented in the gluon fusion, vector-boson fusion (VBF), VH and tt¯H associated production modes, with particular focus on the VBF production mode. The data used to perform the measurements correspond to 140 fb−1 of proton-proton collisions collected by the ATLAS experiment at the LHC. Two methods are used to perform the measurements: the Simplified Template Cross-Section (STXS) approach and an Unfolded Fiducial Differential measurement considering only the VBF phase space. For the STXS measurement, events are categorized by their production mode and kinematic properties such as the Higgs boson’s transverse momentum (pTH), the number of jets produced in association with the Higgs boson, or the invariant mass of the two leading jets (mjj). For the VBF production mode, the ratio of the measured cross-section to the Standard Model prediction for mjj > 1.5 TeV and pTH > 200 GeV (pTH < 200 GeV) is 1.29−0.34+0.39 (0.12−0.33+0.34). This is the first VBF measurement for the higher-pTH criteria, and the most precise for the lower-pTH criteria. The fiducial cross-section measurements, which only consider the kinematic properties of the event, are performed as functions of variables characterizing the VBF topology, such as the signed ∆ϕjj between the two leading jets. The measurements have a precision of 30%–50% and agree well with the Standard Model predictions. These results are interpreted in the SMEFT framework, and place the strongest constraints to date on the CP-odd Wilson coefficient cHW~.
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