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TAMBO collaboration(Argüelles, C. A. et al), & Garcia, A. (2026). Measuring the high-energy neutrino sky using the deep-valley neutrino observatory TAMBO. Nat. Astron., 10, 947–951.
Abstract: Although the field of neutrino astronomy has blossomed in the past decade, physicists have struggled to fully map the high-energy neutrino sky. The Tau Air-shower Mountain-Based Observatory (TAMBO), a mountain-based neutrino observatory, aims to solve that issue-and find clues of new physics along the way.
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LHCb Collaboration(Aaij, R. et al), Fernandez Casani, A., Jaimes Elles, S. J., Jashal, B. K., Libralon, S., Lucio Martinez, M., et al. (2026). First Measurement of Time-Dependent CP Violation in the Flavor-Changing Neutral-Current Decay B0 → KS0μ+μ-. Phys. Rev. Lett., 136(23), 231904–14pp.
Abstract: A flavor-tagged time-dependent analysis of B-0 -> K-S(0)mu(+)mu(-) decays is performed across the full dimuon mass range excluding the J/psi and psi(2S) resonance regions. The analysis uses proton-proton collision data collected by the LHCb experiment in 2011-2018 at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb(-1). The CP violation parameters are determined to be C = -0.13 +/- 0.32 +/- 0.04, S = +0.82 +/- 0.29 +/- 0.05, where the first uncertainties are statistical and the second are systematic. The results are consistent with the standard model prediction. This is the first experimental study of time-dependent CP violation in b -> sl(+)l(-)processes.
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Super-FRS Experiment Collaboration(Shraier, A. et al), & Ayet, S. (2026). Identification of MNT fragments produced by an energy-degraded beam on a target at the FRS Ion Catcher. Eur. Phys. J. A, 62(7), 138–10pp.
Abstract: An experiment on multi-nucleon transfer (MNT) reactions was performed at the FRS Ion Catcher at GSI-FAIR, where an energy-degraded 238U beam reacted with a 209Bi target inside the Cryogenic Stopping Cell (CSC). Target-like fragments (TLF) produced in the CSC were extracted and identified using a Multiple-Reflection Time-of-Flight Mass Spectrometer (MR-TOF-MS). The yields of eight mass-identified A = 210 and A = 211 nuclei were analyzed as a function of degrader thickness, which determines the incoming 238U beam energy, by comparing their dependence on degrader thickness with that of elastic-scattering products. The results indicated that they are produced in MNT reactions. This experiment is the first in which a broad range of MNT fragments was observed in an ion catcher following beam energy degradation from the relativistic realm to the MNT range, just above the Coulomb barrier. It sets the stage for further MNT experiments that are planned at the FRS Ion Catcher with different targets and unstable secondary ion beams.
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Affolder, A. A. et al, & Torres Reoyo, E. (2026). Impact of Cold Noise on the tracking performance of ATLAS ITk short strip barrel modules using a charged particle beam. Nucl. Instrum. Methods Phys. Res. A, 1092, 171800–11pp.
Abstract: The inner tracking system of the ATLAS experiment will be upgraded to a full silicon detector in 2030 for HL-LHC. The new tracking system is called ITk, the Inner Tracker. The ITk requirements include operational efficiency higher than 99% and noise hit occupancy smaller than 0.1%. During the pre-production phase of the ITk project, many short-strip modules were observed to exhibit so-called “Cold Noise (CN)”, wherein clusters of strips displayed very high noise when the modules were operated at temperatures below-35 degrees C. To investigate the CN impact and ensure the quality of module production, huge amount of effort have been put in by the collaboration. This paper focuses on the impact of CN on the tracking performance by examining two short strip modules that exhibit CN: one is non-irradiated, while the other one has been irradiated to the maximum expected end-of-lifetime fluence. For each module, the global and single strip tracking performance are evaluated. The global performance study shows that the non-irradiated module can be operated within specifications with a threshold around 1fC, but it is not possible to operate the irradiated module as required. In the single strip analysis, it was found that while CN does not affect the charge collection, it reduces the operating window and leaves less margin for detector operation. In the non-irradiated module, less than 3% of strips fail the detector requirements in the CN regions. For the irradiated module, about 20% of strips fail the requirements in the low CN region and around 52% fail in the high CN region. The fraction of strips that cannot operate due to CN throughout their lifetime can be predicted according to the measured noise at the required noise occupancy level and its expected median collected charge. In cases when the noise hit occupancy caused by CN is kept below 1% with a threshold smaller than 0.45 fC, at least 60% of strips could meet the operating requirements by the end of detector's lifetime. Thus, the module is likely to satisfy the operating requirements in terms of global efficiency and global noise occupancy.
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Jia, W. H., Song, J., Liang, W. H., & Oset, E. (2026). Scattering data and correlation function for the interaction. Eur. Phys. J. C, 86(7), 761–12pp.
Abstract: We study the interaction of a kaon with the f1(1285) resonance, assuming that the f1(1285) is a molecular state generated by the KK & strns;& lowast;,K & strns;K & lowast; interaction, evaluating the scattering amplitude, the scattering length and effective range of the Kf1 system. The scattering amplitude develops a resonant structure approximately 56 MeV below the Kf1 threshold, with a width of around 123 MeV. The corresponding correlation function has the distinctive shape of a system with a bound state close to threshold. We also show that the interaction of the Kf1 system differs significantly from the one obtained assuming that the f1(1285) is an ordinary, non-molecular, particle. This provides motivation to continue the search for these observables, already initiated by the measurement of the pf1(1285) correlation function by the ALICE collaboration.
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