Reconstructing Neutrino Properties from Collider Experiments in a Higgs Triplet Neutrino Mass Model

We extend the minimal supersymmetric standard model with bilinear R-parity violation to include a pair of Higgs triplet superfields. The neutral components of the Higgs triplets develop small vacuum expectation values (VEVs) quadratic in the bilinear R-parity breaking parameters. In this scheme the atmospheric neutrino mass scale arises from bilinear R-parity breaking while for reasonable values of parameters the solar neutrino mass scale is generated from the small Higgs triplet VEVs. We calculate neutrino masses and mixing angles in this model and show how the model can be tested at future colliders. The branching ratios of the doubly charged triplet decays are related to the solar neutrino angle via a simple formula.Comment: 19 pages, 4 figures; one formula corrected, two author's names corrected; some explanatory comments adde

CP violating effects in coherent elastic neutrino-nucleus scattering processes

The presence of new neutrino-quark interactions can enhance, deplete or distort the coherent elastic neutrino-nucleus scattering (CEνNS) event rate. The new interactions may involve CP violating phases that can potentially affect these features. Assuming light vector mediators, we study the effects of CP violation on the CEνNS process in the COHERENT sodium-iodine, liquid argon and germanium detectors. We identify a region in parameter space for which the event rate always involves a dip and another one for which this is never the case. We show that the presence of a dip in the event rate spectrum can be used to constraint CP violating effects, in such a way that the larger the detector volume the tighter the constraints. Furthermore, it allows the reconstruction of the effective coupling responsible for the signal with an uncertainty determined by recoil energy resolution. In the region where no dip is present, we find that CP violating parameters can mimic the Standard Model CEνNS prediction or spectra induced by real parameters. We point out that the interpretation of CEνNS data in terms of a light vector mediator should take into account possible CP violating effects. Finally, we stress that our results are qualitatively applicable for CEνNS induced by solar or reactor neutrinos. Thus, the CP violating effects discussed here and their consequences should be taken into account as well in the analysis of data from multi-ton dark matter detectors or experiments such as CONUS, ν-cleus or CONNIE.Peer Reviewe

Effect of the Starting Microstructure in the Formation of Austenite at the Intercritical Range in Ductile Iron Alloyed with Nickel and Copper

Intercritical austenitizing is a key step on the production of dual-phase austempered ductile iron. Therefore, understanding the formation of austenite at the intercritical range should provide critical information for the future development of this family of alloys. In this work, a ductile iron alloyed with copper and nickel (3.4 C, 2.6 Si, 0.9 Ni, 0.6 Cu, wt%) was studied. The as-cast alloy was submitted to ferritic annealing and normalizing in order to obtain fully ferritic and fully pearlitic microstructures, respectively. The effect of microsegregation, initial microstructure (ferrite or pearlite) and nodule count on the formation of austenite in the intercritical range under continuous heating was studied using electron probe micro-analyzer—EPMA— high-resolution dilatometry, optical microscopy and scanning electron microscope—SEM—. The results showed that silicon, copper and nickel segregate around the graphite nodules and manganese segregates to the last freezing zones. Also as nodule count increases the segregation level decreased. Regarding the rate of austenite formation, the results showed that it increases as nodule count increases. Additionally, austenite formation is faster when the starting microstructure is pearlitic and it increases as the pearlite interlaminar spacing decreases. Finally, the results showed that the critical temperatures for austenite formation depend mainly on the starting microstructure (ferrite or pearlite).The authors want to acknowledge COLCIENCIAS (Call 727), CODI (PRG 2017-16229) and CENIM (National Center for Metallurgical Research, Madrid, Spain). I. Toda-Caraballo is grateful for financial support of the fellowship 2016-T2/IND-1693, from the Programme Atracción de talento investigador (Consejería de Educación, Juventud y Deporte, Comunidad de Madrid)

Modelling the formation of austenite in the intercritical interval in ductile iron

In this work, the formation of austenite in the intercritical interval under continuous heating and isothermal holding in ductile iron with various chemistries was investigated using high-resolution dilatometry and quantitative metallographic analysis. The study was conducted using fully ferritic and fully pearlitic matrices as initial microstructures. Subsequently, a mathematical model based on Avrami's equation, that describes the formation of austenite at the intercritical range, was proposed and adjusted to the experimental data. The results show that austenite formation at the intercritical range is faster and happens at lower temperatures when the initial microstructure is pearlitic. Additionally, the kinetic of austenite formation did not change by adding Cu and it is accelerated by adding Ni to the alloy. Finally, the Avrami's equation allowed to model the austenite formation under continuous heating followed by isothermal holding with a good adjustment to the experimental data, which contributes to the understanding of the kinetic of austenite formation in ductile iron at the intercritical rangeThe authors want to acknowledge COLCIENCIAS (Call 727), CODI (PRG 2017–16229) and CENIM (National Center for Metallurgical Research-Madrid-Spain)