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Title: The Search for Low Energy Single Photons in MicroBooNE

Abstract

The MiniBooNE experiment is a Cherenkov based experiment located on the Booster Neutrino Beam. It observed an unexplained excess of $$\nu_e$$ charged current quasi-elastic (CCQE) event candidates in the reconstructed $$E_{\nu}^{QE}\approx 200-475$$ MeV region known as the ``Low Energy Excess'' (LEE). These $$\nu_e$$ CCQE event candidates were in the form of lone showers, a signature left by both electrons and photons indistinguishably in the MiniBooNE detector. For this reason the identity of the MiniBooNE LEE as a photon or electron excess is currently unknown. Liquid argon time projection chambers (LArTPCs) are a relatively new type of detector able to distinguish between photons and electrons. The MicroBooNE detector is one such LArTPC and is situated on the same beamline and at a similar baseline as the MiniBooNE detector. This makes MicroBooNE an ideal experiment to test the photon and electron interpretations of the MiniBooNE LEE. This thesis presents the search for a photon LEE using an enhanced rate of neutrino-induced neutral current (NC) $$\Delta$$ production and subsequent radiative decay (NC $$\Delta$$ radiative) as the candidate source. A multi-stage NC $$\Delta$$ radiative event selection has been developed which takes full advantage of MicroBooNE's photon-electron discrimination capability. The ability of the search to select NC $$\Delta$$ radiative events in MicroBooNE and validation of the search with 4.8$$\times 10^{19}$$ protons-on-target worth of data are presented. Also shown are preliminary studies of MicroBooNE's sensitivity to a NC $$\Delta$$ radiative interpretation of the LEE.

Authors:
 [1]
  1. Manchester U.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1498547
Report Number(s):
FERMILAB-THESIS-2018-28
1724196
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Murrells, Robert Gregory. The Search for Low Energy Single Photons in MicroBooNE. United States: N. p., 2018. Web. doi:10.2172/1498547.
Murrells, Robert Gregory. The Search for Low Energy Single Photons in MicroBooNE. United States. doi:10.2172/1498547.
Murrells, Robert Gregory. Mon . "The Search for Low Energy Single Photons in MicroBooNE". United States. doi:10.2172/1498547. https://www.osti.gov/servlets/purl/1498547.
@article{osti_1498547,
title = {The Search for Low Energy Single Photons in MicroBooNE},
author = {Murrells, Robert Gregory},
abstractNote = {The MiniBooNE experiment is a Cherenkov based experiment located on the Booster Neutrino Beam. It observed an unexplained excess of $\nu_e$ charged current quasi-elastic (CCQE) event candidates in the reconstructed $E_{\nu}^{QE}\approx 200-475$ MeV region known as the ``Low Energy Excess'' (LEE). These $\nu_e$ CCQE event candidates were in the form of lone showers, a signature left by both electrons and photons indistinguishably in the MiniBooNE detector. For this reason the identity of the MiniBooNE LEE as a photon or electron excess is currently unknown. Liquid argon time projection chambers (LArTPCs) are a relatively new type of detector able to distinguish between photons and electrons. The MicroBooNE detector is one such LArTPC and is situated on the same beamline and at a similar baseline as the MiniBooNE detector. This makes MicroBooNE an ideal experiment to test the photon and electron interpretations of the MiniBooNE LEE. This thesis presents the search for a photon LEE using an enhanced rate of neutrino-induced neutral current (NC) $\Delta$ production and subsequent radiative decay (NC $\Delta$ radiative) as the candidate source. A multi-stage NC $\Delta$ radiative event selection has been developed which takes full advantage of MicroBooNE's photon-electron discrimination capability. The ability of the search to select NC $\Delta$ radiative events in MicroBooNE and validation of the search with 4.8$\times 10^{19}$ protons-on-target worth of data are presented. Also shown are preliminary studies of MicroBooNE's sensitivity to a NC $\Delta$ radiative interpretation of the LEE.},
doi = {10.2172/1498547},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {1}
}

Thesis/Dissertation:
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