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BMy. CepHH 3. OH3HKA. ACTPOHOMHfl. 2022. №2
CUPID-Mo: A World Leading Limit on Neutrinoless Double Beta Decay of 100Mo
Léonard Imbert (CUPID-Mo Collaboration) E-mail: leonard. imbert@csnsm. in2p3.fr
IJClab, CNRS, Université Paris-Saclay, France Received January 16, 2022
The CUPID-Mo experiment, located in the Laboratoire Souterrain de Modane (France), is a demonstrator for the next generation ton-scale bolometric neutrinoless double beta decay experiment CUPID. CUPID-Mo is composed of 20 Li200MoO4 scintillating bolometers, searching for 0v/3 of 100Mo. With about one year of data acquisition we set a world leading limit on the half-life of 0v/3 decay in 100Mo of T1/2 > 1.8 x 1024 yr at 90% C.I. This limit corresponds to an effective Majorana mass m^ < (0.28i0.49) eV, dependent on the nuclear matrix element in the light Majorana neutrino exchange interpretation.
Keywords: neutrinoless double beta decay, CUPID-Mo, Majorana neutrino.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 369-370.
Non-Standard Interactions in Radiative Neutrino Mass Models
Sudip Jana E-mail: sudip.jana@mpi-hd.mpg.de
Max-Planck-Institut fUr Kernphysik. Heidelberg, 69117 Germany Received February 22, 2022
I present a comprehensive analysis of neutrino non-standard interactions (NSI) generated by new scalars in radiative neutrino mass models. To this end, I propose a new nomenclature for classifying radiative neutrino mass models: those containing at least one SM particle in the loop are designated as type-I radiative models, while those without SM particles in the loop are designated as type-II radiative models. In terms of NSI, type-I radiative models are the most intriguing, since the neutrino couples directly to an SM fermion (matter field) and a new scalar, creating NSI at the tree level, in contrast to type-II radiative models. I summarized the maximum possible NSI in all type-I radiative models after accounting for numerous theoretical and experimental restrictions. Additionally, I demonstrate that using light charged scalars in radiative models can result in a Glashow-like resonance feature in the UHE neutrino event spectrum at the IceCube neutrino observatory and its high-energy upgrade IceCube-Gen2, which can probe a sizable fraction of the allowed NSI parameter space. This talk is based on results obtained with K.S. Babu, Bhupal Dev, Anil Thapa and Yicong Sui and presented in hep-ph 1907.09498 and 1908.02779.
Keywords: NSI, neutrino mass, radiative mechanism.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 371-374.
Physics and Status of SFGD Detector for T2K Experiment
Yury Kudenko (T2K Collaboration) E-mail: kudenko@inr.ru
1 Moscow Institute of Physics and Technology (MIPT), 2Moscow Engineering Physics Institute (MEPhI) 3Institute for Nuclear Research of the Russian Academy of Sciences. Moscow, 117312 Russia
Received January 16, 2022
The upgraded ND280 near detector of the T2K experiment will be able to reduce neutrino interaction uncertainties using a configuration of detectors with full polar angle acceptance, improved spatial resolutions, neutron detection capabilities and reduced tracking thresholds. The status and parameters of a new 3D segmented scintillator detector SuperFGD and the expected physics output will be presented.
Keywords: Neutrino oscillations, CP violation, 3D segmented neutrino detector, neutrino interactions.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 375-378.
