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ATLAS Collaboration(Aad, G. et al), Ahuja, S., Aikot, A., Cabrera Urban, S., Cantero, J., Carrion Martinez, C., et al. (2026). Combined effective field theory interpretation of measurements sensitive to quartic gauge boson couplings in pp collisions at √s=13 TeV with the ATLAS detector. Phys. Lett. B, 879, 140683–19pp.
Abstract: A combination of measurements sensitive to anomalous quartic electroweak gauge boson couplings is presented using proton-proton collision data collected by the ATLAS detector at root s = 13 TeV at the LHC. Contributing analyses include measurements of vector-boson scattering in numerous final states as well as a tri-boson measurement. The combined measurement is used to constrain anomalous electroweak boson quartic self-couplings that result from dimension-8 operators in the Eboli model using an effective field theory. Results are presented as 68% and 95% confidence level intervals parameterised by one or two Wilson coefficients, both with and without unitarity constraints applied. Theoretical bounds from unitarity and positivity are overlaid where relevant. Confidence intervals obtained from simultaneous profiled fits to all Wilson coefficients are also presented.
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ATLAS Collaboration(Aad, G. et al), Ahuja, S., Aikot, A., Amos, K. R., Bouchhar, N., Cabrera Urban, S., et al. (2026). Search for emerging jets in pp collisions at √s=13 TeV with the ATLAS experiment. Eur. Phys. J. C, 86(7), 808–32pp.
Abstract: A search is presented for emerging jets using 140 fb(-1) of proton-proton collision data at root s = 13 TeV, collected by the ATLAS experiment between 2015 and 2018. The search looks for the existence of a dark sector with symmetries similar to those in quantum chromodynamics. This dark sector is populated with dark quarks, which undergo showering similar to quarks in the Standard Model, leading to a high multiplicity of long-lived dark hadrons within a dark jet. These dark hadrons subsequently decay to Standard Model particles via a new heavy scalar mediating particle phi. This results in jets which containmultiple displaced vertices, known as emerging jets. This analysis targets four-jet topologies, with two emerging jets and two Standard Model jets, resulting from the decay of pair-produced scalar mediators. No significant excess above the StandardModel background is observed. For dark pion proper decay lengths of 20 mm, mediator masses are excluded between 1 and 2 TeV assuming a dark pion mass of 20 GeV.
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ATLAS Collaboration(Aad, G. et al), Ahuja, S., Aikot, A., Cabrera Urban, S., Cantero, J., Carrion Martinez, C., et al. (2026). Measurement of the |Vcb| element of the CKM matrix in t(t)over-bar decays with the ATLAS detector. J. High Energy Phys., 07(7), 078–51pp.
Abstract: The first measurement of the magnitude of the CKM quark mixing matrix element vertical bar V-cb vertical bar using on-shell W-boson decays is presented. The measurement is made with t (t) over bar events from pp collision data corresponding to an integrated luminosity of 140 fb(-1) at a centre-of-mass energy of 13TeV collected by the ATLAS experiment at the Large Hadron Collider. A value of:vertical bar V-cb vertical bar = (50(-14)(+11)) ) x 10(-3)is measured, where the uncertainties have roughly equal contributions from the limited size of the data sample and from systematic effects. This is consistent with existing measurements made at much lower energy scales in B hadron decays. While the sensitivity does not yet rival that of previous determinations, this novel approach probes a very different physical situation, namely the rare hadronic t -> b (b) over barc decay at high momentum-transfer, rather than semileptonic B decays at low momentum-transfer.
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Lal Bera, M., Kwan, J., Perez, A., Garcia-March, M. A., Chhajlany, R., Grass, T., et al. (2026). A hybrid Anyon-otto thermal machine. npj Quantum Inform., 12(1), 117–10pp.
Abstract: We propose a four-stroke quantum thermal machine based on the 1D anyon Hubbard model, which is capable of extracting the excess energy arising from anyon exclusion statistics at low temperature into finite work. Defining a hybrid anyon-Otto (HAO) cycle, we find that the low-temperature work, in the absence of any interactions, is maximized in the pseudo-fermionic limit, where the anyons most closely resemble free fermions. However, when weak interactions are introduced, the work output is no longer maximized at the bosonic or pseudo-fermionic extremes but instead peaks at intermediate statistical angles. This clearly demonstrates that interactions and anyonic statistics conspire non-trivially to enhance performance, with interacting anyons offering greater quantum thermodynamic advantage than either bosons or pseudo-fermions, in this regime. Furthermore, we also outline an experimental protocol to realize the HAO cycle using ultracold atoms in an optical lattice.
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Ochoa-Oregon, S. A., Uribe-Ramirez, J. P., Hernandez-Pinto, R. J., Ramirez-Uribe, S., & Rodrigo, G. (2026). Graph theory-based automated quantum algorithm for efficient querying of acyclic and multiloop causal configurations. Commun. Phys., 9(1), 270–14pp.
Abstract: Quantum algorithms provide a promising framework in high-energy physics, in particular, for unraveling the causal configurations of multiloop Feynman diagrams by encoding Feynman propagators as qubits, a challenging task closely analogous to querying directed acyclic graphs in graph theory. In this paper, we introduce the Minimum Clique-optimised quantum Algorithm (MCA), an automated quantum algorithm designed to efficiently query the causal structures within the Loop-Tree Duality, wherein manifestly causal integrand representations of multiloop Feynman diagrams play a central role. The MCA quantum algorithm is optimised by exploiting graph theory techniques, specifically, by analogy with the Minimum Clique Partition problem. The performance of the MCA quantum algorithm across diverse multiloop topologies is assessed by analysing the transpiled quantum circuit depth and quantum circuit area, showing a significant reduction in the quantum resources needed for implementation.
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