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Electron neutrino appearance in the MINOS experiment


Orchanian, Mhair-Armen Hagop (2012) Electron neutrino appearance in the MINOS experiment. Dissertation (Ph.D.), California Institute of Technology.


This thesis describes a search for $\nu_e$ appearance in the two-detector long-baseline MINOS neutrino experiment at Fermilab, based on a data set representing an exposure of $8.2 \times 10^{20}$ protons on the NuMI target. The analysis detailed herein represents an increase in sensitivity to the $\theta_{13}$ mixing angle of approximately 25\% over previous analyses, due to improvements in the event discriminant and fitting technique. Based on our observation, we constrain the value of $\theta_{13}$ further, finding $2\sin^2 \theta_{23} \sin^2 2\theta_{13} < 0.12 (0.20)$ at the 90\% confidence level for $\delta_\mathrm{CP} = 0$ and the normal (inverted) neutrino mass hierarchy. The best-fit value is $2\sin^2 \theta_{23} \sin^2 2\theta_{13} = 0.041^{+0.047}_{-0.031} (0.079^{+0.071}_{-0.053})$ under the same assumptions. We exclude the $\theta_{13}=0$ hypothesis at the 89\% confidence level.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:theta13 mass hierarchy CP violation appearance MINOS electron neutrino
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)
  • Porter, Frank C.
  • Weinstein, Alan Jay
  • Wise, Mark B.
Defense Date:9 May 2012
Record Number:CaltechTHESIS:05302012-124605015
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:7097
Deposited By: Mhair-Armen Orchanian
Deposited On:31 May 2012 20:23
Last Modified:26 Dec 2012 04:43

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