New model of intranuclear neutron-antineutron transformations in 
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Barrow, J. L.; Botvina, A. S.; Golubeva, E.S.; Richard, J.-M.

doi:10.1103/physrevc.105.065501

Cited by 2 publications

(1 citation statement)

References 52 publications

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“…For 40 Ar nuclei, R is expected to take on a value of 5.6 × 10 22 s −1 with an uncertainty of 20% [19]. The most stringent limit on the free neutron transition time is provided by ILL in Grenoble [8] at 0.86 × 10 8 s at the 90% confidence level (CL), while the Super-Kamiokande experiment, using oxygen-bound neutrons and an associated suppression factor of 5.17 × 10 22 s −1 [20,21], corresponds to τ n−n > 4.7 × 10 8 s at the 90% CL [4]. This work presents a deep learning (DL)-based analysis of MicroBooNE data, making use of a sparse convolutional neural network (CNN) [22,23], to search for n → n like signals using primarily their topological signature.…”

Section: Introductionmentioning

confidence: 99%

Cosmic Ray Background Rejection with Wire-Cell LArTPC Event Reconstruction in the MicroBooNE Detector

Abratenko¹,

Alrashed²,

An³

et al. 2021

Phys. Rev. Applied

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For a large liquid argon time projection chamber (LArTPC) operating on or near the Earth's surface to detect neutrino interactions, the rejection of cosmogenic background is a critical and challenging task because of the large cosmic ray flux and the long drift time of the TPC. We introduce a superior cosmic background rejection procedure based on the Wire-Cell three-dimensional (3D) event reconstruction for LArTPCs. From an initial 1:20,000 neutrino to cosmic-ray background ratio, we demonstrate these tools on data from the MicroBooNE experiment and create a high performance generic neutrino event selection with a cosmic contamination of 14.9% (9.7%) for a visible energy region greater than O(200) MeV. The neutrino interaction selection efficiency is 80.4% and 87.6% for inclusive νµ charged-current and νe charged-current interactions, respectively. This significantly improved performance compared to existing reconstruction algorithms, marks a major milestone toward reaching the scientific goals of LArTPC neutrino oscillation experiments operating near the Earth's surface.

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Section: Introductionmentioning

confidence: 99%

Cosmic Ray Background Rejection with Wire-Cell LArTPC Event Reconstruction in the MicroBooNE Detector

Abratenko¹,

Alrashed²,

An³

et al. 2021

Phys. Rev. Applied

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First application of a liquid argon time projection chamber for the search for intranuclear neutron-antineutron transitions and annihilation in ⁴⁰Ar using the MicroBooNE detector

Abratenko,

Alterkait,

Andrade Aldana

et al. 2024

J. Inst.

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We present a novel methodology to search for intranuclear neutron-antineutron transition (n⟶n̅) followed by n̅-nucleon annihilation within an 40Ar nucleus, using the MicroBooNE liquid argon time projection chamber (LArTPC) detector. A discovery of n⟶n̅ transition or a new best limit on the lifetime of this process would either constitute physics beyond the Standard Model or greatly constrain theories of baryogenesis, respectively. The approach presented in this paper makes use of deep learning methods to select n⟶n̅ events based on their unique features and differentiate them from cosmogenic backgrounds. The achieved signal and background efficiencies are (70.22 ± 6.04)% and (0.0020 ± 0.0003)%, respectively. A demonstration of a search is performed with a data set corresponding to an exposure of 3.32 ×1026 neutron-years, and where the background rate is constrained through direct measurement, assuming the presence of a negligible signal. With this approach, no excess of events over the background prediction is observed, setting a demonstrative lower bound on the n⟶n̅ lifetime in 40Ar of τm ≳ 1.1×1026 years, and on the free n⟶n̅ transition time of τn⟶n̅ ≳ 2.6×105 s, each at the 90% confidence level. This analysis represents a first-ever proof-of-principle demonstration of the ability to search for this rare process in LArTPCs with high efficiency and low background.

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New model of intranuclear neutron-antineutron transformations in O816

Cited by 2 publications

References 52 publications

Cosmic Ray Background Rejection with Wire-Cell LArTPC Event Reconstruction in the MicroBooNE Detector

Cosmic Ray Background Rejection with Wire-Cell LArTPC Event Reconstruction in the MicroBooNE Detector

First application of a liquid argon time projection chamber for the search for intranuclear neutron-antineutron transitions and annihilation in ⁴⁰Ar using the MicroBooNE detector

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New model of intranuclear neutron-antineutron transformations in O816

Cited by 2 publications

References 52 publications

Cosmic Ray Background Rejection with Wire-Cell LArTPC Event Reconstruction in the MicroBooNE Detector

Cosmic Ray Background Rejection with Wire-Cell LArTPC Event Reconstruction in the MicroBooNE Detector

First application of a liquid argon time projection chamber for the search for intranuclear neutron-antineutron transitions and annihilation in 40Ar using the MicroBooNE detector

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Product

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About

First application of a liquid argon time projection chamber for the search for intranuclear neutron-antineutron transitions and annihilation in ⁴⁰Ar using the MicroBooNE detector