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Title: Electromagnetic Shower from Cosmic Muons in NOvA Detector

Abstract

NO$$\nu$$A (NuMI Off-Axis $$\nu_e$$ Appearance) experiment is a neutrino $$\nu_\mu \rightarrow \nu_e$$ oscillation experiment with a baseline of 810 km. The signature for a $$\nu_\mu \rightarrow \nu_e$$ oscillation in the far detector is the production of an electromagnetic (EM) shower due to the charge current (CC) interaction of $$\nu_e$$ with the detector material. Cosmic muon induced electromagnetic showers can serve as a source of EM shower sample that can be used as a data-driven method for validating the EM shower modelling and EM shower identification algorithms at NO$$\nu$$A. The work reported in the thesis is the first ever implementation of cosmic muon induced EM shower for such a purpose in the NO$$\nu$$A experiment. We extracted EM shower sample from two sources - muon undergoing bremsstrahlung (Brem) and muon decay in flight to electron (DiF). Brem sample, extracted from cosmic muon, turns out to be a very useful data-driven method for testing EM shower modelling and the part icle identification (PID) algorithms for the detection of $$\nu_e$$-CC interactions. A new muon removal (MR) technique is developed and applied to remove the muon hits inside the bremsstrahlung shower. However, a complete removal of the muon energy in the event is not possible with high efficiency. DiF induced EM shower, on the other hand, is exactly similar to $$\nu_e$$-CC EM shower because DiF is a pure electron initiated EM shower. Therefore, DiF EM shower, once extracted, mimicks the shower of a $$\nu_e$$-CC interaction event. We present the extraction methods for both brem and DiF events in MC and cosmic data in far and near detector of NO$$\nu$$A and its use in data driven validation of $$\nu_e$$ EM shower modelling and $$\nu_e$$ signal selection efficiency across the detector. A systematic uncertainty is also assigned on $$\nu_e$$ appearance signal selection based on this study to take into account the difference in EM shower modelling in data and MC.

Authors:
 [1]
  1. Indian Inst. Tech., Guwahati
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:
1439282
Report Number(s):
FERMILAB-THESIS-2018-09
1674855
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

Yadav, Nitin. Electromagnetic Shower from Cosmic Muons in NOvA Detector. United States: N. p., 2018. Web. doi:10.2172/1439282.
Yadav, Nitin. Electromagnetic Shower from Cosmic Muons in NOvA Detector. United States. doi:10.2172/1439282.
Yadav, Nitin. Mon . "Electromagnetic Shower from Cosmic Muons in NOvA Detector". United States. doi:10.2172/1439282. https://www.osti.gov/servlets/purl/1439282.
@article{osti_1439282,
title = {Electromagnetic Shower from Cosmic Muons in NOvA Detector},
author = {Yadav, Nitin},
abstractNote = {NO$\nu$A (NuMI Off-Axis $\nu_e$ Appearance) experiment is a neutrino $\nu_\mu \rightarrow \nu_e$ oscillation experiment with a baseline of 810 km. The signature for a $\nu_\mu \rightarrow \nu_e$ oscillation in the far detector is the production of an electromagnetic (EM) shower due to the charge current (CC) interaction of $\nu_e$ with the detector material. Cosmic muon induced electromagnetic showers can serve as a source of EM shower sample that can be used as a data-driven method for validating the EM shower modelling and EM shower identification algorithms at NO$\nu$A. The work reported in the thesis is the first ever implementation of cosmic muon induced EM shower for such a purpose in the NO$\nu$A experiment. We extracted EM shower sample from two sources - muon undergoing bremsstrahlung (Brem) and muon decay in flight to electron (DiF). Brem sample, extracted from cosmic muon, turns out to be a very useful data-driven method for testing EM shower modelling and the part icle identification (PID) algorithms for the detection of $\nu_e$-CC interactions. A new muon removal (MR) technique is developed and applied to remove the muon hits inside the bremsstrahlung shower. However, a complete removal of the muon energy in the event is not possible with high efficiency. DiF induced EM shower, on the other hand, is exactly similar to $\nu_e$-CC EM shower because DiF is a pure electron initiated EM shower. Therefore, DiF EM shower, once extracted, mimicks the shower of a $\nu_e$-CC interaction event. We present the extraction methods for both brem and DiF events in MC and cosmic data in far and near detector of NO$\nu$A and its use in data driven validation of $\nu_e$ EM shower modelling and $\nu_e$ signal selection efficiency across the detector. A systematic uncertainty is also assigned on $\nu_e$ appearance signal selection based on this study to take into account the difference in EM shower modelling in data and MC.},
doi = {10.2172/1439282},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2018},
month = {Mon Jan 01 00:00:00 EST 2018}
}

Thesis/Dissertation:
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