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Antineutrino oscillations in the atmospheric sector


Himmel, Alexander I. (2011) Antineutrino oscillations in the atmospheric sector. Dissertation (Ph.D.), California Institute of Technology.


This thesis presents measurements of the oscillations of muon antineutrinos in the atmospheric sector, where world knowledge of antineutrino oscillations lags well behind the knowledge of neutrinos, as well as a search for $\numu \to \nubar$ transitions. Differences between neutrino and antineutrino oscillations could be a sign of physics beyond the Standard Model, including non-standard matter interactions or the violation of \CPT symmetry. These measurements leverage the sign-selecting capabilities of the magnetized steel-scintillator MINOS detectors to analyze antineutrinos from the NuMI beam, both when it is in \FHC and when it is in \RHC. Antineutrino oscillations are observed at $\dmbar = \left(3.36^{+0.46}_{-0.40} (\textrm{stat}) \pm 0.06 (\textrm{syst})\right) \times \val{10^{-3}}{eV^{2}}$ and $\snbar = 0.860^{+0.11}_{-0.12} (\textrm{stat}) \pm 0.01 (\textrm{syst})$. The oscillation parameters measured for antineutrinos and those measured by MINOS for neutrinos differ by a large enough margin that the chance of obtaining two values as discrepant as those observed is only $2\%$, assuming the two measurements arise from the same underlying mechanism, with the same parameter values. No evidence is seen for neutrino-to-antineutrino transitions.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:neutrino antineutrino anti-neutrino oscillations cpt nsi
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Newman, Harvey B.
Thesis Committee:
  • Newman, Harvey B. (chair)
  • Patterson, Ryan B.
  • Wise, Mark B.
  • Weinstein, Alan Jay
Defense Date:10 May 2011
Record Number:CaltechTHESIS:05162011-162816431
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6399
Deposited By: Alexander Himmel
Deposited On:17 May 2011 18:46
Last Modified:12 Dec 2018 22:49

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