Carver, Antony (2010) Electron identification in and performance of the ND280 Electromagnetic Calorimeter. PhD thesis, University of Warwick.

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Abstract

T2K is an off axis neutrino beam experiment with a baseline of 295 km to
the far detector, Super-Kamiokande. The near detector, ND280, measures
the
flux and energy spectra of electron and muon neutrinos in the direction
of Super-Kamiokande. An electromagnetic calorimeter constructed from lead
and scintillator surrounds the inner detector. Three time projection chambers
and two fine grained scintillator detectors sit inside the calorimeter. This
thesis describes the development of a particle identification algorithm for the
calorimeter and studies how it can enhance a simple electron neutrino analysis.
A particle identification algorithm was written for the electromagnetic calorimeter
to separate minimally ionising particles, electromagnetic and hadronic
showers. A Monte Carlo study suggested that the algorithm produced an
electron sample with a relative muon contamination of 10-2 whilst maintaining
an electron efficiency of 80%. Data collected at CERN was then used
to make comparisons between the Monte Carlo simulation used to train the
particle identification, and experimental data. A reasonable agreement was
found between the electron data and the Monte Carlo simulation, given that
the available calibration framework was still preliminary. Cosmic data agreed
well with simulation. The energy resolution of the DsECal for electromagnetic
showers was estimated at 9%/√E. An electron neutrino analysis was developed
that could be performed on T2K data from the first day of data taking.
This analysis anticipated finding 33 +- 10(sys) +- 6(stat) CCQE electron neutrino
events and 92 +- 28(sys) +- 10(stat) CCnQE electron neutrino events in
the FGD after 12 months of nominal running.

Item Type:	Thesis or Dissertation (PhD)
Subjects:	Q Science > QC Physics
Library of Congress Subject Headings (LCSH):	Neutrinos, Calorimeters, Muons, Particles -- Analysis, Electrons -- Analysis
Official Date:	March 2010
Dates:	Date Event March 2010 Submitted
Institution:	University of Warwick
Theses Department:	Department of Physics
Thesis Type:	PhD
Publication Status:	Unpublished
Supervisor(s)/Advisor:	Boyd, Steve B. ; Barker, Gary John
Extent:	x, xv, 206 leaves : ill., charts
Language:	eng

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