Avoiding Blindness in Baryon Number Violating Processes: Free-Beam and Intranuclear Paths to Neutron-Antineutron Transitions Article Swipe

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J. Barrow , P. Fierlinger , David Milstead , Rabindra N. Mohapatra , Valentina Santoro ·

YOU? · · 2025 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2511.01829

Experimental searches for neutron--antineutron ($n \rightarrow \bar n$) transitions can be considered via two approaches: conversion in free-neutron beams and intranuclear transformation leading to matter instability in large-mass detectors. Plans for next-generation searches make it timely to highlight the complementarity, necessity, and limitations of each method. Converting the bound neutron limit into one for free neutrons traditionally utilizes nucleus-specific estimates of the in-medium suppression of $n \rightarrow \bar n$, obtained within mean-field theory under a single-operator assumption. This paper highlights how this suppression can be scenario-dependent, which can lead to deviations from the standard approach that can span several orders of magnitude. A further goal of the paper is to point out the need for a broader phenomenology program for $n\rightarrow \bar{n}$ that is akin to those developed for electric dipole moments and other systems for which short-distance new physics must be studied in-medium.

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Type: preprint
Landing Page: http://arxiv.org/abs/2511.01829
PDF: https://arxiv.org/pdf/2511.01829
OA Status: green
OpenAlex ID: https://openalex.org/W4416440244

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DOI: https://doi.org/10.48550/arxiv.2511.01829

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Title: Avoiding Blindness in Baryon Number Violating Processes: Free-Beam and Intranuclear Paths to Neutron-Antineutron Transitions

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Type: preprint

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Publication year: 2025

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Publication date: 2025-11-03

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Authors: J. Barrow, P. Fierlinger, David Milstead, Rabindra N. Mohapatra, Valentina Santoro

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Landing page: https://arxiv.org/abs/2511.01829

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PDF URL: https://arxiv.org/pdf/2511.01829

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