Search for Lorentz and CPT symmetries violation in double-beta decay using data from the GERDA experiment

Many versions of Quantum Gravity foresee the breakdown, at the Planck scale, of two of the building blocks of the Standard Model of Particle Physics (SM): the Lorentz and the CPT symmetries. Direct observations at the Planck scale are not yet possible, however Physics beyond the SM could produce effects at low energies, for example in the neutrino sector. We discuss the presence of a Lorentz and CPT-violating double-beta decay mode in data from the Phase II of the GERDA experiment, located at LNGS in Italy.ope

Modeling of GERDA Phase II data

The GERmanium Detector Array (GERDA) experiment at the Gran Sasso underground laboratory (LNGS) of INFN is searching for neutrinoless double-beta ($0\nu\beta\beta$) decay of $^{76}$Ge. The technological challenge of GERDA is to operate in a "background-free" regime in the region of interest (ROI) after analysis cuts for the full 100$\,$kg$\cdot$yr target exposure of the experiment. A careful modeling and decomposition of the full-range energy spectrum is essential to predict the shape and composition of events in the ROI around $Q_{\beta\beta}$ for the $0\nu\beta\beta$ search, to extract a precise measurement of the half-life of the double-beta decay mode with neutrinos ($2\nu\beta\beta$) and in order to identify the location of residual impurities. The latter will permit future experiments to build strategies in order to further lower the background and achieve even better sensitivities. In this article the background decomposition prior to analysis cuts is presented for GERDA Phase II. The background model fit yields a flat spectrum in the ROI with a background index (BI) of $16.04^{+0.78}_{-0.85} \cdot 10^{-3}\,$cts/(kg$\cdot$keV$\cdot$yr) for the enriched BEGe data set and $14.68^{+0.47}_{-0.52} \cdot 10^{-3}\,$cts/(kg$\cdot$keV$\cdot$yr) for the enriched coaxial data set. These values are similar to the one of Gerda Phase I despite a much larger number of detectors and hence radioactive hardware components

Modeling of GERDA Phase II data

The GERmanium Detector Array (Gerda) experiment at the Gran Sasso underground laboratory (LNGS) of INFN is searching for neutrinoless double-beta (0νββ) decay of 76Ge. The technological challenge of Gerda is to operate in a “background-free” regime in the region of interest (ROI) after analysis cuts for the full 100 kg·yr target exposure of the experiment. A careful modeling and decomposition of the full-range energy spectrum is essential to predict the shape and composition of events in the ROI around Qββ for the 0νββ search, to extract a precise measurement of the half-life of the double-beta decay mode with neutrinos (2νββ) and in order to identify the location of residual impurities. The latter will permit future experiments to build strategies in order to further lower the background and achieve even better sensitivities. In this article the background decomposition prior to analysis cuts is presented for Gerda Phase II. The background model fit yields a flat spectrum in the ROI with a background index (BI) of 16.04+0.78−0.85⋅10−3 cts/(keV·kg·yr) for the enriched BEGe data set and 14.68+0.47−0.52⋅10−3 cts/(keV·kg·yr) for the enriched coaxial data set. These values are similar to the one of Phase I despite a much larger number of detectors and hence radioactive hardware components

Unravelling the Scientific Debate on How to Address Wolf-Dog Hybridization in Europe

Anthropogenic hybridization is widely perceived as a threat to the conservation of biodiversity. Nevertheless, to date, relevant policy and management interventions are unresolved and highly convoluted. While this is due to the inherent complexity of the issue, we hereby hypothesize that a lack of agreement concerning management goals and approaches, within the scientific community, may explain the lack of social awareness on this phenomenon, and the absence of effective pressure on decision-makers. By focusing on wolf x dog hybridization in Europe, we hereby (a) assess the state of the art of issues on wolf x dog hybridization within the scientific community, (b) assess the conceptual bases for different viewpoints, and (c) provide a conceptual framework aiming at reducing the disagreements. We adopted the Delphi technique, involving a three-round iterative survey addressed to a selected sample of experts who published at Web of Science listed journals, in the last 10 years on wolf x dog hybridization and related topics. Consensus was reached that admixed individuals should always be defined according to their genetic profile, and that a reference threshold for admixture (i.e., q-value in assignment tests) should be formally adopted for their identification. To mitigate hybridization, experts agreed on adopting preventive, proactive and, when concerning small and recovering wolf populations, reactive interventions. Overall, experts' consensus waned as the issues addressed became increasingly practical, including the adoption of lethal removal. We suggest three non-mutually exclusive explanations for this trend: (i) value-laden viewpoints increasingly emerge when addressing practical issues, and are particularly diverging between experts with different disciplinary backgrounds (e.g., ecologists, geneticists); (ii) some experts prefer avoiding the risk of potentially giving carte blanche to wolf opponents to (illegally) remove wolves, based on the wolf x dog hybridization issue; (iii) room for subjective interpretation and opinions result from the paucity of data on the effectiveness of different management interventions. These results have management implications and reveal gaps in the knowledge on a wide spectrum of issues related not only to the management of anthropogenic hybridization, but also to the role of ethical values and real-world management concerns in the scientific debate

Sensitivity to the neutrino mass hierarchy with the JUNO experiment

the aim of the current research is to study the sensitivity to te JUNO experiment on the neutrino mass hierarchy, by using a X2 analysis we find the sensitivity depends strongly on the baseline length and the energy resolutio

gipert/0vbb-ge76-history: v1.0.1

<p><strong>Full Changelog</strong>: https://github.com/gipert/0vbb-ge76-history/commits/v1.0.1</p&gt

Search for Lorentz and CPT symmetries violation in double-beta decay using data from the GERDA experiment

Many versions of Quantum Gravity foresee the breakdown, at the Planck scale, of two of the building blocks of the Standard Model of Particle Physics (SM): the Lorentz and the CPT symmetries. Direct observations at the Planck scale are not yet possible, however Physics beyond the SM could produce effects at low energies, for example in the neutrino sector. We discuss the presence of a Lorentz and CPT-violating double-beta decay mode in data from the Phase II of the GERDA experiment, located at LNGS in Italy

A Python-based Software Stack for the LEGEND Experiment

The LEGEND experiment is designed to search for the lepton-number-violating neutrinoless double beta decay of 76Ge. The collaboration has selected Python as main programming language of its open source primary software stack, employed in decoding digitizer data and up to the most high-level analysis routines. Numba-based hardware acceleration of digital signal processing algorithms is provided through a package of potentially great interest for digitized data stream analyses. Moreover, the framework can be of general interest for any kind of tier-based analysis flow, with customizable chains of algorithms (kernels) defined through JSON configuration files. The LEGEND file format is HDF5-based, to ensure compliance with FAIR data principles. Modern development practices on packaging, style checking, CI/CD and documentation have been adopted. In this talk, I will present an overview of the LEGEND software stack and discuss its role within the PyHEP community

Capitolo X - Interpretazione dei risultati della ricerca, bilancio e proposte

Il capitolo esamina i risultati delle interviste (che hanno coinvolto professionisti della salute nei diversi Paesi considerati), formula un bilancio e avanza alcune proposte operativ

Interpretazione dei risultati della ricerca, bilancio e proposte

Il saggio espone le conclusioni dei partecipanti al Progetto di Ricerca Dipartimentale finanziato dall’Università degli studi di Udine dal titolo "La legge 291/2017 (Norme in materia di consenso informato e di disposizioni anticipate di trattamento): contenuto, portata innovativa, difficoltà applicative". La ricerca ha avuto come responsabile scientifico, Luigi Gaudino