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Understanding the Physics Behind Neutrino Masses
André de Gouvêa
8:30 a.m. - 9:06 a.m.
Nonzero neutrino masses are the most palpable evidence for physics beyond the Standard Model. Neutrino oscillations reveal, beyond reasonable doubt, that neutrino masses are not zero. While we can explain (almost all) neutrino data very successfully, the dynamical mechanism behind nonzero neutrino masses remains unknown. There are many compelling new physics scenarios capable of generating neutrino masses in a way that is consistent with the world's neutrino data, and it behooves us to figure out which one, if any, is realized by nature. I will pose the question, discuss a few possibility, and highlight some of the future experimental efforts that may help us piece the neutrino puzzle.
Neutrino Mass - Cosmology, direct measurements, neutrinoless double beta decay
Susanne Mertens, TUM/MPI-Munich
9:06 a.m. - 9:42 a.m.
With a mass at least six orders of magnitudes smaller than the mass of an electron - but non-zero - neutrinos are a clear misfit in the Standard Model of Particle Physics. On the one hand, its tiny mass makes the neutrino one of the most interesting particles, one that might hold the key to physics beyond the Standard Model. On the other hand this minute mass leads to great challenges in its experimental determination. Three approaches are currently pursued: An indirect neutrino mass determination via cosmological observables, the search for neutrinoless double beta-decay, and a direct measurement based on the kinematics of single beta-decay. This talk will present the current status and future perspectives of all three approaches.
Unveiling the high-energy neutrino sky with lceCube
Marcos Santander, University of Alabama
9:42 a.m. - 10:18 a.m.
High-energy neutrinos can propagate over cosmological distances unabated by intervening matter and radiation fields, carrying with them information about some of the most powerful objects in the Universe. In 2013 the lceCube neutrino observatory, a cubic-kilometer particle detector at the South Pole, announced the first detection of an astrophysical neutrino flux in the TeV-PeV range. This discovery prompted a wide-ranging observational effort aimed at identifying the sources of this flux by combining lceCube measurements with observations spanning the electromagnetic spectrum. On September 22, 201,7 lceCube detected a high-energy neutrino event and promptly circulated its sky coordinates to the astronomical community, leading to the identification of the gamma-ray blazar TXS 0506+056 as its potential electromagnetic counterpart. The temporal and spatial correlation between the neutrino and the blazar high-energy emission, coupled with previous neutrino detections from the direction of the blazar in 2014-2015, provides compelling evidence for the first identification of an astrophysical source of high-energy neutrinos. This talk will summarize recent results from lceCube concentrating on the search for neutrino sources and present an outlook for the future of these studies.