Neutrinos as Precision Probes of Particle Physics, Cosmology and Astrophysics

• Applicant: Dr. Werner Rodejohann
• Subject Area: Nuclear and Elementary Particle Physics, Quantum Mechanics, Relativity, Fields
• Term: from 2010 to 2015
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 165111547

• Final Report Year: 2015

Final Report Abstract

We have studied various aspects of neutrino physics, ranging from aspects of ultra-high energetic cosmic rays to ultra-light Z'-physics. Non-standard neutrino physics was studied and the many particle physics aspects of neutrinoless double beta decay were discussed. Theoretical models were constructed and close-to-experiment aspects were investigated. Highlights were the demonstration that new experiments on neutrino oscillations imply that the rate on μ →eγ is non-vanishing in a broad class of models, stressing that the physics interpretation of neutrinoless double beta decay is not as simple as thought, and the discussion of the Glashow resonance at neutrino telescopes, from which one could learn about the sources of ultra-high energetic neutrinos. Most importantly, the existing fruitful collaborations of myself and my group with colleagues from India were intensified and many new contacts were made. The collaboration will continue in the future.

Publications

• "Lower bounds on the smallest lepton mixing angle" Phys. Rev. D 83 (2011) 033002
  S. Ray, W. Rodejohann and M. A. Schmidt
  
• "The Glashow resonance at IceCube: signatures, event rates and pp vs. py interactions" JCAP 1110 (2011) 017
  A. Bhattacharya, R. Gandhi, W. Rodejohann and A. Watanabe
  
• "Lower Limits on μ →eγ from New Measurements on Ue3" Phys. Rev. D 86 (2012) 075020
  J. Chakrabortty, P. Ghosh and W. Rodejohann
  
• "Constraining Neutrino Mass from Neutrinoless Double Beta Decay" Phys. Rev. D 88 (2013) 091301
  P. S. Bhupal Dev, S. Goswami, M . Mitra and W. Rodejohann