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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. doi:10.7907/7E4S-QQ82.


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 νμ \to ν̅ μ 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 |Δm̅2atm| = (3.36+0.46-0.40(stat)±0.06(syst)) x 10- eV2 and sin2(2θ̅23 = 0.860+0.11-0.12(stat)± 0.01(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:26 Oct 2021 18:37

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