Earth skimming tau neutrino propagation: structure function parametrization and dipole model EARTH SKIMMING TAU NEUTRINO PROPAGATION:STRUCTURE FUNCTION PARAMETRIZATION AND DIPOLE MODEL

Minh Luu, Minh Luu, Vincent Rodgers, Jane Nachtman, Wayne Polyzou, Palle Jorgensen
2017 unpublished
Part of the Physics Commons Recommended Citation Luu, Minh Vu. "Earth skimming tau neutrino propagation: structure function parametrization and dipole model." PhD (Doctor of Philosophy) thesis, University of Iowa, 2017. ACKNOWLEDGMENTS First of all, I would like to thank Mary Hall Reno for being the fantastic guidance through my journey here in University of Iowa: It was a pleasure working with her in the last 5 years. I would also like to thank my family and friend for their support and
more » ... support and encouragement at every moment in my time abroad. Finally, the special thanks go to my father, who has ever been a force pushing me forward but care for me deeply always, and to my mother, whose greatest concern is always my health and well-being. Without them, I would not be, and will never be where I am today. ii ABSTRACT We consider the high energy Earth skimming tau neutrinos converting to taus following by tau propagation through rock. The difficulty in predicting the final tau flux comes from the phenomenological uncertainties in the tau electromagnetic energy loss and the neutrino-nucleon cross section. In the first part, we focus on connecting the dipole cross section from a theoretical parametrization of the electromagnetic structure function F 2 , then uses said cross section to compute the tau's energy loss at high energies during Earth propagation. We find the extracted dipole cross section agrees well with other derivations and dipole models. In the second part, we use different approaches to F 2 and the dipole model to evaluate the corresponding energy loss and cross section. We keep consistent the same approach through both calculations of energy loss and neutrino cross section, and find the emerging tau fluxes match well. We also present the results from our Monte Carlo simulation and our analytic evaluation, and we find that they are in agreement. Finally, we briefly discuss the relevence to several experiments that are looking for skimming astro-physical taus, such as the Pierre Auger Observatory, HAWC, and ASHRA. As a demonstration , we show our approximation of the aperture at the Pierre Auger Observatory using the energy losses and cross sections calculated from the considered approaches. iii PUBLIC ABSTRACT We consider the high energy Earth skimming tau neutrinos converting to taus following by tau propagation through rock. The difficulty in predicting the final tau flux comes from the phenomenological uncertainties in the tau electromagnetic energy loss and the neutrino-nucleon cross section. In the first part, we focus on connecting the dipole cross section from a theoretical parametrization of the electromagnetic structure function F 2 , then uses said cross section to compute the tau's energy loss at high energies during Earth propagation. We find the extracted dipole cross section agrees well with other derivations and dipole models. In the second part, we use different approaches to F 2 and the dipole model to evaluate the corresponding energy loss and cross section. We keep consistent the same approach through both calculations of energy loss and neutrino cross section, and find the emerging tau fluxes match well. We also present the results from our Monte Carlo simulation and our analytic evaluation, and we find that they are in agreement. Finally, we briefly discuss the relevence to several experiments that are looking for skimming astro-physical taus, such as the Pierre Auger Observatory, HAWC, and ASHRA. As a demonstration , we show our approximation of the aperture at the Pierre Auger Observatory using the energy losses and cross sections calculated from the considered approaches.
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