The impact of sterile neutrinos on CP measurements at long baselines

Gandhi, Raj; Kayser, Boris; Masud, Mehedi; Prakash, Suprabh

doi:10.1007/JHEP11(2015)039

Title: The impact of sterile neutrinos on CP measurements at long baselines

Journal Article · Tue Sep 01 00:00:00 EDT 2015 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP11(2015)039· OSTI ID:1223243

Gandhi, Raj ^[1]; Kayser, Boris ^[2]; Masud, Mehedi ^[3]; Prakash, Suprabh ^[3]

Harish-Chandra Research Inst., Allahabad (India); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Harish-Chandra Research Inst., Allahabad (India)

With the Deep Underground Neutrino Experiment (DUNE) as an example, we show that the presence of even one sterile neutrino of mass ~1 eV can significantly impact the measurements of CP violation in long baseline experiments. Using a probability level analysis and neutrino-antineutrino asymmetry calculations, we discuss the large magnitude of these effects, and show how they translate into significant event rate deviations at DUNE. These results demonstrate that measurements which, when interpreted in the context of the standard three family paradigm, indicate CP conservation at long baselines, may, in fact hide large CP violation if there is a sterile state. Similarly, any data indicating the violation of CP cannot be properly interpreted within the standard paradigm unless the presence of sterile states of mass O(1 eV) can be conclusively ruled out. Our work underscores the need for a parallel and linked short baseline oscillation program and a highly capable near detector for DUNE, but in order that its highly anticipated results on CP violation in the lepton sector may be correctly interpreted.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1223243

Report Number(s):: FERMILAB-PUB-15-323-T; arXiv eprint number arXiv:1508.06275

Journal Information:: Journal of High Energy Physics (Online), Vol. 2015, Issue 11; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 64 works

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