We investigate the possibility of using the Short-Baseline Near Detector (SBND) at Fermilab to constrain lepton flavor violating decays of pions and kaons. We study how to leverage SBND-PRISM, the use of the neutrino beam angular spread to mitigate systematic uncertainties, to enhance this analysis. We show that SBND-PRISM can put stringent limits on the flavor violating branching ratios BR(π+→μ+νe)=8.9×10−4, BR(K+→μ+νe)=3.2×10−3, improving previous constraints by factors 9 and 1.25, respectively. We also estimate the SBND-PRISM sensitivity to lepton number violating decays, BR(π+→μ+νe)=2.1×10−3 and BR(K+→μ+νe)=7.4×10−3, though not reaching previous BEBC limits. Last, we identify several ways how the SBND collaboration could improve this analysis.
@article{arxiv.2405.00777,
title = {Could SBND-PRISM probe Lepton Flavor Violation?},
author = {Gustavo F. S. Alves and Pedro A. N. Machado and Renata Zukanovich Funchal},
journal= {arXiv preprint arXiv:2405.00777},
year = {2025}
}