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Jang, Y. et al, & Morales, A. I. (2026). Yrast-state lifetimes in 94Pd at the transition between the isoscalar and isovector coupling regimes. Phys. Rev. C, 114(2), 024342–9pp.
Abstract: Half-lives of yrast excited states in 94Pd were measured using isomeric decay spectroscopy. The experiment was performed at Radioactive Isotope Beam Factory, where 94Pd ions were produced via in-flight fragmentation of a 124Xe beam impinging on a 9Be target. These ions were implanted into the GARi active stopper array, and isomeric delayed gamma rays were detected with the IDATEN fast-timing array consisting of 48 LaBr3(Ce) detectors. The half-lives were determined using the generalized centroid difference method, yielding the T1/2 values of 15 ps, 13(11) ps, 13 ps, 693(72) ps, and 19 ps for the (2+1 ), (4+1 ), (6+1 ), (8+1 ), and (10+1 ) states, respectively. Reduced transition probabilities were deduced from the measured half-lives and discussed in the context of shell-model calculations employing the JUN45 effective interaction. The results indicate that 94Pd, with N = Z + 2, lies in a transitional regime between the N = Z isoscalar-pairing domain (92Pd) and the N = 50 isovector-dominated region (96Pd).
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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). Effective field theory interpretation of ATLAS measurements involving the Higgs boson, electroweak bosons and the top quark. J. High Energy Phys., 07(7), 238–67pp.
Abstract: Wilson coefficients in dimension-six effective field theory are constrained in a combined fit to several ATLAS measurements. These inputs probe Higgs-boson processes across multiple production and decay modes, di-Higgs signatures in the b (b) over bar gamma gamma and b (b) over bar tau tau final states, WW and WZ diboson signatures, electroweak Zjj final states, high-mass Drell-Yan interactions, and t (t) over bar events in both resolved and boosted topologies. Precision electroweak observables from LEP, SLD, and ATLAS are also included. A total of 48 parameters, including individual Wilson coefficients in the Warsaw basis and linear combinations of Wilson coefficients, are constrained simultaneously. Constraints on two-Higgs-doublet models and heavy-vector-boson models are also obtained by matching a relevant sub-set of the results with their parameters. This combined fit provides the most comprehensive effective field theory interpretation of experimental data by the ATLAS Collaboration to date. No significant deviations from the Standard Model are observed.
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Hsieh, C. Y., & Gessner, M. (2026). General quantum resources providing advantages in work-extraction tasks. Phys. Rev. A, 114(2), 022456–12pp.
Abstract: In developing quantum science and technologies, it is essential to demonstrate so-called quantum advantages, which are performances that can be achieved only with the assistance of quantum resources. Most of the time, different quantum features lead to different advantages. Interestingly, there are certain classes of tasks where quantum advantages are achievable by general quantum resources. This work reports such a class of tasks in thermodynamics-we provide a work-extraction task that certifies general quantum resources of both states and channels, suggesting general quantum effects can provide nonclassical advantages in work extraction. We also show that such work-extraction tasks can be applied to certify quantum entanglement in a one-sided device-independent way. As an application, we report a novel type of anomalous energy flow-a type of locally extractable energy that is attributed to the globally distributed entanglement. Finally, we show that the existence of this novel anomalous energy flow is equivalent to measurement incompatibility.
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Prasad, V. et al, Lacasta, C., Marinas, C., Mazorra de Cos, J., & Molina-Bueno, L. (2027). Upgrade of the Belle II vertex detector with depleted monolithic CMOS active pixel sensors. Nucl. Instrum. Methods Phys. Res. A, 1093, 171963–5pp.
Abstract: The Belle II experiment, operating at the asymmetric SuperKEKB e+e-collider, is preparing an upgrade of its vertex detector to cope with an increased luminosity of 6 & times; 1035 cm-2s-1. The upgraded vertex detector (VTX) will consist of five or six layers of depleted monolithic active pixel sensors (DMAPS), with a total material budget of approximately 3% X/X0. The OBELIX chip, derived from the TJ-Monopix2 sensor and fabricated using Tower-Jazz Semiconductor 180 nm CMOS technology, is being developed for this upgrade. It features a 33 & micro;m pixel pitch with a time-stamping binning of 50-100 ns, along with a dedicated digital periphery compatible with the Belle II trigger system, supporting rates up to 30 kHz. The sensor is designed to operate under the high background conditions expected at the target luminosity, with radiation tolerance up to 5 & times;1014 neq/cm2 and 100 Mrad, while targeting a power density of about 200 mW/cm2. This corresponds to hit rates up to 120 MHz/cm2. Beam test and irradiation studies of TJ-Monopix2 demonstrate that the operating sensor temperature should stay below 40 degrees C after irradiation up to 5 & times; 1014 neq/cm2. This report reviews the proposed VTX concept, sensor performance, and ongoing R&D activities.
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Ardu, M., Calibbi, L., Fedele, M., & Mescia, F. (2026). ALP production in lepton flavour violating meson, tau and gauge boson decays. J. High Energy Phys., 08(8), 217–36pp.
Abstract: In this paper we study axion-like particles (ALPs) with lepton-flavour-violating (LFV) couplings in the mass regime above the muon threshold, m(a) > m(mu), where the strong bound from the exotic muon decay μ-> ea no longer apply and the decay channel a -> e μbecomes kinematically accessible. In this region, the ALP typically decays promptly, motivating new search strategies based on its production in decays involving virtual muons. We analyse charged-meson and W decays, neutral-current processes such as Z and quarkonium decays, and, when couplings to the third generation are present, LFV tau decays. The subsequent decay a -> e μleads to striking LFV signatures with negligible Standard Model backgrounds. Combining these production modes with current low-energy constraints, we assess the sensitivity of future high-energy e (+) e (-) colliders, flavour factories such as Belle II and STCF, fixed-target experiments such as NA62, and proton beam-dump facilities such as SHiP. Overall, our results identify LFV ALP production in meson, gauge-boson, quarkonium and tau decays (with displaced vertices) as a promising and largely unexplored avenue to test ALP interactions with charged leptons above the muon mass threshold.
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