Abstract
The Deep Underground Neutrino Experiment (DUNE) is a leading experiment in neutrino physics which is presently under construction. DUNE aims to measure the yet unknown parameters in the three flavour oscillation scenario which includes discovery of leptonic CP violation, determination of the mass hierarchy and determination of the octant of $\theta_{23}$. Additionally, the ancillary goals of DUNE include probing the sub-dominant effects induced by new physics. A widely studied new physics scenario is that of nonstandard neutrino interactions (NSI) in propagation which impacts the oscillations of neutrinos. We consider some of the essential NSI parameters impacting the oscillation signals at DUNE and explore the space of NSI parameters as well as study their correlations among themselves and with the yet unknown CP violating phase, $\delta$ appearing in the standard paradigm. The experiment utilizes a wide band beam and provides us with a unique opportunity to utilize different beam tunes at DUNE. We demonstrate that combining information from different beam tunes (low energy, LE and medium energy, ME) available at DUNE impacts the ability to probe some of these parameters and leads to altering the allowed regions in two-dimensional space of parameters considered.
Highlights
In a seminal paper in 1978, Wolfenstein first proposed the possibility that nonstandard neutrino interactions (NSI) could be responsible for conversion of a given neutrino flavor to another even if neutrinos were massless [1]
We address the question of constraining the parameter space of NSI parameters at Deep Underground Neutrino Experiment (DUNE) by exploiting a wide band nature of the beam
We systematically study correlations among various parameters using two beam tunes (LE and medium energy (ME)) and illustrated that to probe a subset of NSI parameter space more effectively, it is advantageous to use a combination of low energy (LE) and ME tuned beams as opposed to using only the standard LE beam tune
Summary
In a seminal paper in 1978, Wolfenstein first proposed the possibility that nonstandard neutrino interactions (NSI) could be responsible for conversion of a given neutrino flavor to another even if neutrinos were massless [1]. Reference [20] focuses on LBNO and addresses prospects of probing strength of propagation NSI parameters at long baseline experiments as a function of the oscillation channel, baseline length and detector mass. It should be noted that the studies carried out so far on constraining NSI terms on DUNE has invariably utilized the standard low energy (LE) flux that peaks around the first oscillation maximum for Pμe i.e., around 2–3 GeV. We advance in this direction by incorporating different beam tunes at DUNE and understand the role of beam tunes in constraining the NSI parameters. Appendix C contains the SI-NSI event difference plot for some representative choice of parameters
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