scholarly journals Testing new physics with future low-energy neutrino experiments

1999 ◽  
Author(s):  
Omar G. MIRANDA
Keyword(s):  
New Physics ◽  
Low Energy ◽  
Energy Neutrino ◽  
Neutrino Experiments

TESTING NEW PHYSICS WITH NEUTRINOS AND LEPTOGENESIS

2011 ◽  
Vol 26 (26) ◽  
pp. 1917-1931
Author(s):  
PASQUALE DI BARI
Keyword(s):  
New Physics ◽  
Low Energy ◽  
Heavy Flavor ◽  
Seesaw Mechanism ◽  
Flavor Symmetries ◽  
Energy Neutrino ◽  
Test Models ◽  
Neutrino Experiments

Latest developments in leptogenesis are reviewed with a particular emphasis on the possibilities to test models of new physics, embedding the seesaw mechanism, by combining the requirement of successful leptogenesis with the information from low energy neutrino experiments. In particular, we discuss the role played by light and heavy flavor effects in the determination of the final asymmetry and the attractive features of the N2-dominated scenario that is naturally realized within SO(10) models. We also discuss leptogenesis within discrete flavor symmetries models, supersymmetry and in the minimal two right-handed (RH) neutrino model.

scholarly journals Identification of the cosmogenic $$^{11}$$C background in large volumes of liquid scintillators with Borexino

2021 ◽  
Vol 81 (12) ◽  
Author(s):  
M. Agostini ◽  
K. Altenmüller ◽  
S. Appel ◽  
V. Atroshchenko ◽  
Z. Bagdasarian ◽  
...  
Keyword(s):  
Solar Neutrino ◽  
Time Correlation ◽  
Space Time ◽  
Low Energy ◽  
High Multiplicity ◽  
Data Sets ◽  
Novel Technique ◽  
Energy Neutrino ◽  
Time Correlations ◽  
Neutrino Experiments

AbstractCosmogenic radio-nuclei are an important source of background for low-energy neutrino experiments. In Borexino, cosmogenic $$^{11}$$ 11 C decays outnumber solar pep and CNO neutrino events by about ten to one. In order to extract the flux of these two neutrino species, a highly efficient identification of this background is mandatory. We present here the details of the most consolidated strategy, used throughout Borexino solar neutrino measurements. It hinges upon finding the space-time correlations between $$^{11}$$ 11 C decays, the preceding parent muons and the accompanying neutrons. This article describes the working principles and evaluates the performance of this Three-Fold Coincidence (TFC) technique in its two current implementations: a hard-cut and a likelihood-based approach. Both show stable performances throughout Borexino Phases II (2012–2016) and III (2016–2020) data sets, with a $$^{11}$$ 11 C tagging efficiency of $$\sim 90$$ ∼ 90  % and $$\sim $$ ∼  63–66 % of the exposure surviving the tagging. We present also a novel technique that targets specifically $$^{11}$$ 11 C produced in high-multiplicity during major spallation events. Such $$^{11}$$ 11 C appear as a burst of events, whose space-time correlation can be exploited. Burst identification can be combined with the TFC to obtain about the same tagging efficiency of $$\sim 90\%$$ ∼ 90 % but with a higher fraction of the exposure surviving, in the range of $$\sim $$ ∼  66–68 %.

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