| |
LHCb Collaboration(Aaij, R. et al), Fernandez Casani, A., Jaimes Elles, S. J., Libralon, S., Lucio Martinez, M., Martinez-Vidal, F., et al. (2026). Angular analysis of the B+ → π+μ+μ- decay. J. High Energy Phys., 08(8), 004–23pp.
Abstract: This paper presents the first measurement of the forward-backward asymmetry, AFB, and the flat term, F-H, that parameterise the angular distribution of the B+ -> pi(+)mu(+)mu(-) decay. The proton-proton collision dataset used in the analysis corresponds to an integrated luminosity of 9 fb(-1), collected with the LHCb experiment between 2011 and 2018. The analysis is performed in two intervals of dimuon mass squared, one above and one below the region containing the J/psi and psi(2S) narrow charmonium resonances. The Standard Model predictions lie within the obtained 68% confidence level interval in the high-mass and within the 99% interval in the low-mass region.
|
|
Hernandez-Garcia, J., Lopez-Pavon, J., & Urrea, S. (2026). Sharpening new physics searches in neutrino oscillations with DUNE-PRISM. J. High Energy Phys., 10(10), 046–28pp.
Abstract: Upcoming long-baseline neutrino oscillation experiments such as DUNE aim to achieve unprecedented precision, but their physics reach is ultimately constrained by systematic uncertainties in neutrino flux predictions and neutrino-nucleus cross sections. These limitations are especially critical for new-physics searches in neutrino oscillations at the near detector, including non-unitarity and sterile neutrinos, where the signal manifests as small distortions in the energy spectrum and is therefore highly sensitive to spectral uncertainties. The PRISM (Precision Reaction Independent Spectrum Measurement) technique offers a robust strategy to mitigate these effects by exploiting measurements at multiple off-axis angles, effectively providing a data-driven handle to reduce systematics. In this work, we demonstrate that PRISM can significantly reduce the impact of large systematic uncertainties, restoring sensitivity to non-unitarity and sterile neutrino scenarios in the electron and muon sectors to a level comparable to that obtained with small spectral uncertainties. We also include the results for the tau sector with PRISM; however, in this case, since the majority of the flux measured at off-axis angles lies below the tau production threshold, we find the improvement to be marginal. As part of this work, we have obtained neutrino and antineutrino fluxes for different off-axis angles with higher statistics than those provided by the DUNE collaboration. We make available these fluxes as auxiliary material to this manuscript.
|
|
Liu, S. W., Lyu, W. T., & Xie, J. J. (2026). Probing the hadronic molecular nature of the Ω(2012), Ω(2380), and Ωc(3120) via femtoscopy correlation functions. Phys. Lett. B, 882, 140979–9pp.
Abstract: We investigate the femtoscopic correlation functions of systems associated with the Omega(2012), Omega(2380), and Omega(c)(3120) resonances, with the aim of elucidating their internal structures. By employing effective potential models that incorporate both s-wave and d-wave interactions, we calculate the correlation functions for the relevant coupled channels. Our numerical results reveal pronounced enhancement structures in the Xi(0) K- and Xi(+)(c) K- correlation functions, which provide direct evidences for the dynamically generated Omega(2012) and Omega(c)(3120) states. Furthermore, significant low-momentum enhancements are observed in the Xi*0K(-) and Xi*K-0*(-) channel, which are attributed to the Omega(2012) and Omega(2380) resonances. These theoretical calculations provide crucial insights for future high-precision measurements at the LHC and RHIC, offering a novel and independent approach to determine the dynamically generated hadronic molecular nature of these Omega excited states.
|
|
KM3NeT, F. - L. A. T. and S. V. O. M. C.(A., O. et al), Alves Garre, S., Bariego-Quintana, A., Calvo, D., Cecchini, V., Garcia Soto, A., et al. (2026). Characterizing Candidate Blazar Counterparts of the Ultra-high-energy Event KM3-230213A. Astron. J., 172(3), 139–34pp.
Abstract: High-energy astrophysical neutrinos serve as crucial messengers for understanding hadronic acceleration processes and identifying the origins of cosmic rays, with blazars among the most promising neutrino sources. The KM3NeT experiment reported the detection of an ultrahigh-energy neutrino with an energy estimate of similar to 220 PeV, the most energetic yet observed. The neutrino arrival direction has a 99% confidence region of 3 degrees radius centered at R.A. 94.degrees 3, decl. -7.degrees 8 (J2000). In this work, 17 candidate blazars located within this region are identified. Comprehensive new observations and archival data analysis for these sources are presented. The study provides a complete multiwavelength coverage across radio, optical, X-ray, and gamma-ray bands, including proprietary data and dedicated follow-up observations. This study highlights flaring behavior in several candidate counterparts. One object exhibits a radio flare coinciding with the neutrino arrival time, with a pre-trial chance probability of 0.26%. Only for this object, the chance probability could be quantified in a robust way. Another candidate displays a rising trend in X-ray flux in a 1 yr window around the neutrino arrival time, while a third undergoes a gamma-ray flare during the same period. Based on the observational findings presented here, while none of these candidates can conclusively be linked to the neutrino, the implications of a possible blazar origin for the KM3NeT event are discussed.
|
|
n_TOF Collaboration(Mucciola, R. et al), Babiano-Suarez, V., Balibrea-Correa, J., Domingo-Pardo, C., Ladarescu, I., & Lerendegui-Marco, J. (2026). Improved 94Mo neutron resonance parameters from neutron capture and transmission measurements at n_TOF and GELINA. Phys. Rev. C, 114(3), 034623–16pp.
Abstract: We report high-resolution measurements of the 94Mo(n, gamma) 95Mo cross section in the neutron energy range from a few eV up to about 250 keV, performed at the n_TOF facility (CERN), and of the 94Mo(n, tot) cross section up to 32 keV, measured at GELINA (JRC Geel). A combined R-matrix analysis of capture and transmission data yields significantly improved neutron-resonance parameters for 94Mo. A total of 186 resonances were observed in this analysis, of which 127 were not present in latest evaluations. The resulting Maxwellian-averaged cross section at stellar temperatures relevant to the slow neutron-capture process (s-process) is approximately 25% lower than previous evaluations and literature values. To assess the astrophysical impact of the revised cross section, we performed s-process nucleosynthesis calculations for low-mass asymptotic giant branch stars. Despite the substantial reduction in the 94Mo(n, gamma) 95Mo rate, the final yields vary by only 3%-4%. This demonstrates that the isotopic budget of 94Mo in asymptotic giant branch stars is primarily governed by the branching flow at 94Nb rather than by the neutron-capture destruction on 94Mo itself. The new cross section thus helps disentangle nuclear cross-section uncertainties from branching-flow effects in the s-process production of 94Mo.
|
|
|
