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NEXT Collaboration(Miller, R. L. et al), Ayet, S., Cortes-Parra, C., Kellerer, F., Lopez-March, N., Martin-Albo, J., et al. (2025). Barium ion sensing with IPG K+ molecular probes. Analyst, , 10pp.
Abstract: Fluorophores covalently bound to azacrown ether ionophores can be assembled into sensitive turn-on chemosensors. The size specificity and electron-rich nature of the ionophore's binding domain contribute to both selectivity and strong turn-on fluorescence sensing by various mechanisms when properly constructed. Aza-18-crown-6 ethers are quite selective for binding to K+ and Ba2+, yet the more electron-withdrawing dicationic nature of barium imposes a larger electronic effect on turn-on fluorescent sensors. Barium chemosensors can be important for measuring soluble Ba2+ in drinking water and have gained recent attention for their potential to enhance the detection of rare events in xenon decay. Here we quantify the capability of three chemosensors, marketed for biologically useful K+ sensing, as effective probes for Ba2+ ions. We present measurements from bulk spectrofluorometry to characterize the system in aqueous solutions and demonstrate the usefulness of these species for low-background single-ion fluorescence microscopy, revealing new candidates for Ba2+ sensing.
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Cherchiglia, A., Pasquini, P., Peres, O. L. G., Rodrigues, F. F., Rossi, R. R., & Souza, E. S. (2025). Alleviating the present tension between T2K and NOνA with nonstandard neutrino interactions. Phys. Rev. D, 112(9), 093004–8pp.
Abstract: Since neutrino oscillation was observed, several experiments have been built to measure its parameters. NuMI Off-axis ve Appearance (NOvA) and Tokai-to-Kamioka (T2K) are two long-baseline experiments dedicated to measuring mainly the mixing angle 823, the charge-parity (CP) conjugation phase MCP, and the mass ordering. However, there is a tension in current data. The T2K allowed region is in conflict with the region allowed by NOvA. We propose a nonstandard charged current interaction (CC-NSI) in neutrino production to relieve this tension. The CC-NSI is computed through quantum field theory formalism, where we derive perturbative analytical formulae considering CC-NSI in the pion decay. Within this new approach, we can alleviate NOvA and T2K tension for CC-NSI complex parameters of order 10-3. We show the new phase has a degeneracy to the Dirac CP phase of the form MCP + % = 1.52c, being a possible source of violation of charge-parity symmetry.
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Ikeno, N., & Oset, E. (2025). Correlation function for the n Ds0(2317) interaction * and the issue of elastic unitarity. Phys. Rev. D, 112(9), 094019–11pp.
Abstract: We study the interaction of a neutron with the D<overline>*s0(2317) resonance and look at the amplitude below threshold and close above threshold. The study is done from the perspective that the D*s0(2317) resonance is a molecular state of DK in I = 0. To study this interaction, we use the fixed center approximation to Faddeev equations that considers the DK molecule as the cluster and the neutron as the external particle. We improve the fixed center approach to implement elastic unitarity around threshold, which is needed to obtain scattering parameters and to evaluate the nD<overline>*s0(2317) correlation function that we determine here. One interesting result of the study is the appearance of a resonant state below threshold with a binding of about 130 MeV and a width of about 80 MeV, which we suggest to look at in reactions measuring the invariant mass of pi Sigma Dbar<overline>. The ALICE collaboration has initiated studies of this type, by looking at the pf1(1285) correlation function, and we can only encourage work in this direction, which should provide much valuable information on the nature of many resonant states.
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Entem, D. R., Nieves, J., & Oller, J. A. (2025). Contact potentials in the presence of a regular finite-range interaction using dimensional regularization and the N/D method. Phys. Rev. D, 112(9), 096007–24pp.
Abstract: We solve the Lippmann-Schwinger equation (LSE) with a kernel that includes a regular finite-range potential and additional contact terms with derivatives. We employ distorted wave theory and dimensional regularization, as proposed in Nieves [Phys. Lett. B 568, 109 (2003)]. We analyze the spin singlet nucleonnucleon S-wave as case of study, with the regular one-pion exchange (OPE) potential in this partial wave and up to O(Q6) (six derivatives) contact interactions. We discuss in detail the renormalization of the LSE and show that the scattering amplitude solution of the LSE fulfills exact elastic unitarity and inherits the left-hand cut of the long-distance OPE amplitude. Furthermore, we proof that the LSE amplitude coincides with that obtained from the exact N/D calculation, with the appropriate number and typology of subtractions to reproduce the effective range parameters taken as input to renormalize the LSE amplitude. The generalization to a higher number of derivatives is straightforward.
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ATLAS Collaboration(Aad, G. et al), Aikot, A., Amos, K. R., Bouchhar, N., Cabrera Urban, S., Cantero, J., et al. (2025). Evidence for Longitudinally Polarized W Bosons in the Electroweak Production of Same-Sign W Boson Pairs in Association with Two Jets in pp Collisions at √s=13 TeV with the ATLAS Detector. Phys. Rev. Lett., 135(11), 111802–27pp.
Abstract: This Letter reports the first evidence of electroweak production of same-signW boson pairs where at least one of theW bosons is longitudinally polarized and the most stringent constraint to date for the production of two longitudinally polarized same-sign W bosons. The dataset used corresponds to an integrated luminosity of 140 fb(-1) of proton-proton collisions at a center-of-mass energy of 13 TeV, collected with the ATLAS detector during run 2 of the Large Hadron Collider. The study is performed in final states including two same-sign leptons (electrons or muons), missing transverse momentum, and at least two jets with a large invariant mass and a large rapidity difference. Two independent fits are performed targeting the production of same-signW bosons with at least one, or two longitudinally polarizedW bosons. The observed (expected) significance of the production with at least one longitudinally polarized W boson is 3.3 (4.0) standard deviations. An observed (expected) 95% confidence level upper limit of 0.45 (0.70) fb is reported on the fiducial production cross section of two longitudinally polarized same-sign W bosons.
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