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20th LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS
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Status of the Search for Light Sterile Neutrinos at Short Baselines
Alessandro Minotti1'2 E-mail: alessandro.minotti@unimib.it
1 Dipartimento di Fisica «Giuseppe Occhialini», U2, Universita degli Studi di Milano-Bicocca. 20126 Milano MI, Italy
2INFN, sezione di Milano-Bicocca. 20126 Milano MI, Italy Received January 16, 2022
The quest for 013 in the 2010's prompted new models for reactor ve spectra, which marked the emergence of the reactor antineutrino anomaly. Several projects worldwide were designed to study the anomaly and investigate the possible existence of extra sterile neutrino families. This article reports an overview of the most recent experimental results on the search for reactor neutrino oscillation at very short baseline, and their implication in our current understanding of the reactor antineutrino anomaly and the sterile neutrino hypothesis.
Keywords: neutrino oscillation, sterile neutrinos, physics BSM, reactor facilities.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 379-380.
Sensitivity to the Neutrino Electric Millicharge of Experiments Involving Elastic Neutrino-Electron and Coherent Elastic Neutrino-Nucleus Processes
A. Parada
E-mail: alexander.parada00@usc.edu.co
Facultad de Ciencias Basicas, Universidad Santiago de Cali, Campus Pampalinda Santiago de Cali, 760035, Colombia Received February 22, 2022
Different constraints to the neutrino electric millicharge (NEM) have been obtained by considering interactions such as the elastic neutrino-electron scattering (ENES). However, the great potential of the coherent elastic neutrino-nucleus scattering (CEvNS) in future reactor neutrino experiments could be an alternative to improve the current limits on the NEM. In this work we study the sensitivity of ENES and CEvNS interactions in reactor experiments to the neutrino charge through a combination of different experimental data. Bounds up to the order of 10-14e are achieved from CEvNS at reactor neutrino experiments.
Keywords: millicharge, coherent, and neutrino.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 381-384.
Deciphering the Solar Neutrino Flux and Properties with Borexino
G. Ranucci1'2 (on behalf of the Borexino Collaboration) E-mail: gioacchino. ranucci@mi. infn. it
1 Dipartimento di Fisica, Universita degli Studi e INFN, 20133 Milano, Italy 2Istituto Nazionale di Fisica Nucleare-Sezione di Milano. Milano, 20133 Italy Received January 16, 2022
Over the last decade breakthrough neutrino results came from Borexino, a massive, calorimetric liquid scintillator detector installed at the underground Gran Sasso Laboratory. With its unprecedented radiopurity levels attained in the core of the detection medium, it was, until it took data, the only experiment able to study in real time solar neutrino interactions in the challenging sub-MeV energy region. The recently achieved outstanding first observation of the CNO flux is thoroughly described in this work. Its other results in the solar neutrino field are remined, namely the first real time, spectroscopic measurement of the pp flux, the precise measurement of the 7 Be flux, the high significance pep flux observation, and the measurement of the 8B neutrino spectrum. Such an impressive series of outputs makes Borexino the only experiment operated so far which was able to perform the full solar neutrino spectroscopy. The physics implications in the realm of neutrino oscillations stemming from the plethora of Borexino outputs is also illustrated.
Keywords: solar neutrinos, Borexino.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 387-392.
