Could SBND-PRISM probe lepton flavor violation?

Journal Article · Tue Aug 27 20:00:00 EDT 2024 · Physical Review. D.

DOI:https://doi.org/10.1103/PhysRevD.110.035031· OSTI ID:2438405

Alves, Gustavo F. S.; Funchal, Renata Zukanovich; Machado, Pedro A. N.

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 $\mathrm{BR}({\pi }^{+}\to {\mu }^{+}{\nu }_e)=8.9\times {10}^{-4}$ , $\mathrm{BR}({\mathrm{K}}^{+}\to {\mu }^{+}{\nu }_e)=3.2\times {10}^{-3}$ , improving previous constraints by factors 9 and 1.25, respectively. We also estimate the SBND-PRISM sensitivity to lepton number violating decays, $\mathrm{BR}({\pi }^{+}\to {\mu }^{+}{\overline{\nu }}_e)=2.1\times {10}^{-3}$ and $\mathrm{BR}({\mathrm{K}}^{+}\to {\mu }^{+}{\overline{\nu }}_e)=7.4\times {10}^{-3}$ , though not reaching previous Big European Bubble Chamber limits. Last, we identify several ways how the SBND collaboration could improve this analysis.

Published by the American Physical Society 2024

• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Grant/Contract Number: AC02-07CH11359
• OSTI ID: 2438405
• Alternate ID(s): OSTI ID: 2346169
• Journal Information: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 3 Vol. 110; ISSN PRVDAQ; ISSN 2470-0010
• Publisher: American Physical Society
• Country of Publication: United States
• Language: English