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Capdevila, B., Matias, J., Novoa-Brunet, M., Patel, M., & Smith, M. (2025). Model-independent unbinned analysis of B → K* (→ K+π- )μ+μ-: Zeroes, bounds, Wilson coefficients, and symmetries. Phys. Rev. D, 112(1), 016007–26pp.
Abstract: We present a model-independent method to study the four-body decay B -> K* (-> K+pi(-) )mu(+)mu(-), based on extracting continuous observables with a moments approach. The method allows the observables to be determined unbinned in both the dilepton and K+pi(-) invariant masses on which the decay dynamics depend. This will allow the method to shed new light on how the observables depend on the P- and S-wave contributions to theK(+)pi(-) system. This approach contrasts with the state-of-the-art analyses, which bin in dilepton and K+pi(-) mass or use a model for the dependence of the underlying decay amplitudes on these masses. The method does not require making a statistical fit and so avoids problems of biases and poor uncertainty estimation when dealing with small samples or a large number of fit parameters. We provide the Standard Model predictions for the unbinned optimized observables, derive new geometrical bounds on their values, and study the robustness of these bounds in the presence of a scalar new physics contribution. We explore the zero-crossing points of P2 and P04;5 observables as a function of a new physics contribution to the dominant vector Wilson coefficient, CNP9 . We also discuss the conditions that can be used to test the theoretical model of the amplitudes needed for an experimental amplitude analysis. Finally, as an illustration, we show how the proposed method might be used to extract the zero-crossing points, make a comparison with the bounds and test a nontrivial relation between the observable values.
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Ilma, Rafi Alam, M., Alvarez-Ruso, L., Benitez Galan, M., Ruiz Simo, I., & Singh, S. K. (2025). Neutrino-nucleon elastic scattering in presence of nonstandard interactions: Cross sections and nucleon polarizations. Phys. Rev. D, 112(1), 013002–13pp.
Abstract: New physics beyond the Standard Model (SM) may appear in the form of nonstandard neutrino interactions (NSIs). We have studied neutral current (anti)neutrino-nucleon scattering in presence of NSIs. We obtain that in this scenario, nucleon matrix elements depend not only on the isovector axial nucleon form factor but also on the isoscalar one. For the axial form factors we consequently rely on the quark flavor decomposition performed by QCD simulations in the lattice (LQCD). We have examined cross sections and polarization observables. For the current bounds on diagonal muon flavor NSI couplings, we find substantial deviations from the SM predictions in cross sections and transverse polarizations of the outgoing nucleons. In view of the progress in the precision of LQCD determinations of nucleon properties, modern measurements of neutral current (anti)neutrino-nucleon scattering will be in the position to discover or significantly constrain NSIs.
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LHCb Collaboration(Aaij, R. et al), Fernandez Casani, A., Jaimes Elles, S. J., Jashal, B. K., Libralon, S., Martinez-Vidal, F., et al. (2025). Branching fraction measurement of the decay B+ → ψ(2S) φ(1020)+. Phys. Rev. D, 111(9), 092008–15pp.
Abstract: The branching fraction of the decay B+ ->psi(2S)phi(1020)K+, relative to the topologically similar decay B+ -> J psi phi(1020)K+, is measured using proton-proton collision data collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb(-1). The ratio is found to be 0.061 +/- 0.004 +/- 0.009, where the first uncertainty is statistical and the second systematic. Using the world-average branching fraction for B+ -> J psi phi(1020)K+, the branching fraction for the decay B+ ->psi(2S)phi(1020)K+ is found to be (3.0 +/- 0.2 +/- 0.5 +/- 0.2) x 10(-6), where the first uncertainty is statistical, the second systematic, and the third is due to the branching fraction of the normalization channel.
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Song, W. Y. et al: V., J. (2025). Roadmap: medical physics technologies in brachytherapy. Phys. Med. Biol., 70(14), 14RM01–68pp.
Abstract: Brachytherapy is a crucial modality of radiotherapy for cancer, known for its effectiveness in delivering high doses of radiation directly to tumours while sparing surrounding healthy tissues. Despite its clinical importance, recent years have witnessed a concerning decline in its utilization, which negatively impacts patient outcomes. This decline is attributed to several factors, with the inherent complexity of brachytherapy, fair reimbursement policies, and high dexterity being significant barriers. There are silver linings, however, as growing number of applications are seen in continents such as Africa, as well as advances in medical physics technology offering promising solutions to these challenges. This roadmap paper aims to provide a comprehensive overview and preview of advancements in brachytherapy, as well as strategies to address key challenges in four critical areas: 'Imaging and Image Guidance,' 'Treatment Planning,' 'Treatment Delivery,' and 'Brachytherapy Outcomes.' We anticipate that these advances will enhance therapeutic efficacy, equipping clinicians worldwide with the tools needed to deliver state-of-the-art cancer treatments and fostering a promising future in oncology care.
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Lerendegui-Marco, J., Balibrea-Correa, J., Alvarez-Rodriguez, P., Babiano-Suarez, V., Gameiro, B., Ladarescu, I., et al. (2025). First pilot tests of Compton imaging and boron concentration measurements in BNCT using i-TED. Appl. Radiat. Isot., 225, 112009–9pp.
Abstract: Dosimetry in BNCT poses significant challenges due to the indirect effect of neutrons interacting with elements within the body and uncertainties associated with the uptake of boron compounds used in clinical practice. Current treatment planning relies on unconventional estimates of boron tumor uptake derived from prior PET scans and thus, an online boron-uptake monitor would be highly convenient. This work presents the first pilot experiments carried out at ILL-Grenoble with the high-efficiency Compton camera i-TED, hereby aiming at demonstrating its applicability for BNCT dosimetry by introducing real-time measurement of the boron concentration and imaging capabilities of spatial dose distribution. In this experiment, we measured the 10B uptake of different cancer cells of tongue squamous cell carcinoma, malignant melanoma and glioblastoma treated with BPA (80 ppm of 10B). The samples were irradiated with the thermal neutron spectrum of ILL-Grenoble and the 478 keV 1-rays from the 7Li de-excitation after the neutron-boron reaction were registered both with the Compton imager and the high-sensitivity FIPPS HPGe array. These series of measurements allowed us to demonstrate the imaging capabilities of the Compton imaging device for the 478 keV 1-rays of interest for dosimetry in BNCT, as well as to assess its sensitivity, which was found to be below 1 μg of 10B.
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