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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). Search for massive, long-lived particles in events with displaced vertices and displaced muons in pp collisions at √s=13.6 TeV with the ATLAS experiment. Phys. Lett. B, 878, 140509–23pp.
Abstract: A search is presented for massive long-lived particles in events featuring at least one displaced vertex and at least one displaced muon, using proton-proton collision data collected by the ATLAS detector at the Large Hadron Collider from 2022 to 2024 at a centre-of-mass energy of 13.6 TeV. The data sample corresponds to an integrated luminosity of 164 fb(-1). The analysis targets scenarios in which long-lived particles decay inside the ATLAS inner detector, resulting in a topology of at least one massive, displaced vertex (DV) with multiple associated tracks, and at least one muon with a large transverse impact parameter relative to the primary interaction point. The muon is not required to be associated with the DV. Two signal regions are defined by the transverse distance of the reconstructed DV from the interaction point. Background contributions are estimated by using fully data-driven techniques. No significant excess above the expected background is observed. Upper limits at 95% confidence level are set on the visible cross-section and on the production cross-sections of several benchmark models of R-parity-violating supersymmetry.
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Gama, F. S., Nascimento, J. R., Olmo, G. J., Petrov, A. Y., & Porfírio, P. J. (2026). Nonlocal spinor superfield theory. Phys. Lett. B, 879, 140685–5pp.
Abstract: In this work, we propose a new three-dimensional nonlocal spinor superfield model. This theory is constructed by introducing form factors in the local spinor superfield action. Then, we couple it minimally to a scalar superfield, for which we calculate the one-loop effective potential as a first constructive example of perturbative calculations in this new theory.
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Dai, X. C., Jia, S., Nefediev, A., Nieves, J., Shen, C. P., & Zhang, L. M. (2026). Exotic hadrons associated with b-quark. Phys. Rep., 1191, 1–62.
Abstract: Compared to charmonium-like states, exotic hadrons associated with b-quark offer distinct advantages for exploring the nature of multiquark phenomena and the dynamics of the strong interaction. Due to the heavier bottom quark mass, theoretical calculations, particularly those based on effective field theories and potential models, tend to be more reliable and under better control in the bottomonium sector. With its clean e+e-collision environment and high luminosity, the Belle and Belle II experiments are ideally suited to explore these exotic hadrons associated with b-quark, including Zb, Xb, and Yb states, and charmonium-like states in B decays. Utilizing the large proton-proton collision dataset, the LHCb experiment has conducted extensive investigations of heavy-flavor multiquark states through B and Lambda b decay channels. The relevant phenomenological interpretations are also reviewed.
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Baeza-Ballesteros, J., Figueroa, D. G., Florio, A., Lizarraga, J., Loayza, N., Marschall, K., et al. (2026). The art of simulating the early Universe. Part II. Non-canonical cases & gravitational waves. J. Cosmol. Astropart. Phys., 06(6), 087–119pp.
Abstract: We present a discussion on lattice techniques for the simulation of non-canonical field theory circumstances, complementing our previous monograph [1] on canonical cases. We begin by reviewing basic aspects of lattice field theory, including symplectic and nonsymplectic evolution algorithms. We then introduce lattice implementations of non-canonical interactions, considering scalars with a non-minimal coupling to gravity, phi 2R, non-minimal scalar kinetic theories, Gab({phi c})partial derivative & micro;phi a partial derivative & micro;phi b, and axion-like particle (ALP) interactions with Abelian gauge fields, phi F & micro;nu F & micro;nu. Next, we discuss methods to set up special field configurations, including the creation of cosmic defect networks towards scaling (e.g. cosmic strings and domain walls), field configurations based on arbitrary power spectra or spatial profiles, and probabilistic methods as required e.g. for thermal configurations. We further extend the notion of non-canonical theories, discussing the discretization of scalar field dynamics in d + 1 dimensions, with d =/ 3. Unrelated to non-canonical aspects, we also discuss implementation(s) of gravitational wave (GW) dynamics on the lattice. This document represents the theoretical basis for the non-canonical field theory aspects (interactions, initial conditions, dimensionality) and GW dynamics implemented in CosmoLattice v2.0 to be released in 2026.
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Bhattacharya, A., Campanario, F., Carlotti, S., Chang, J. M., Mazzitelli, J., Mühlleitner, M., et al. (2026). Higgs-pair production via gluon fusion: top-Yukawa-and light-quark-induced electroweak corrections. J. High Energy Phys., 07(7), 057–21pp.
Abstract: Gluon fusion, gg -> HH, is the dominant Higgs-pair production process at the Large Hadron Collider (LHC) and provides the first direct access to the trilinear Higgs self-interaction. The process is loop-induced, with the main contribution emerging from top-quark loops within the Standard Model. In the past, the QCD corrections have been calculated and found to increase the cross section significantly. With the anticipated accuracies achievable at the high-luminosity LHC (HL-LHC), the theoretical uncertainties will be of increased relevance to compete with the experimental precision at the level of less than 30%. In this work, we take the next steps towards the determination of the complete electroweak corrections at next-to-leading order by calculating the full top-Yukawa and light-quark induced corrections. These corrections modify the cross section moderately in the kinematical regimes of interest.
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