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arXiv · 2610.37555

Search for Neutrino-Produced Long-Lived Particles Using the SBND Cosmic Ray Tagger Beam Telescope

R. Acciarri·L. Aliaga-Soplin·D. Andrade Aldana·C. Andreopoulos·A. Antonakis·S. Balasubramanian·A. Barnard·V. Basque·J. R. Bateman·A. Beever·B. Behera·M. Betancourt·A. Bhat·M. Bishai·A. Blake·B. Bogart·D. Brailsford·A. Brandt·S. Brickner·M. B. Brunetti·G. A. N. Buzzard·L. Camilleri·D. Caratelli·D. Carber·B. Carlson·M. F. Carneiro·R. Castillo Fernandez·F. Cavanna·A. Chappell·H. Chen·S. Chung·R. Coackley·J. I. Crespo-Anadón·C. Cuesta·Y. Dabburi·O. Dalager·M. Dall'Olio·S. K. Das·M. Del Tutto·Z. Djurcic·V. do Lago Pimentel·S. Dominguez-Vidales·M. Donnachie·M. Dubnowski·K. Duffy·S. Dytman·A. Ereditato·E. Espinoza·J. J. Evans·A. C. Ezeribe·C. Fan·A. Filkins·B. Fleming·W. Foreman·D. Franco·G. Fricano·I. Furic·A. P. Furmanski·S. Gao·D. Garcia-Gamez·S. Gardiner·I. Gil-Botella·S. Gollapinni·P. Green·W. C. Griffith·L. Hagaman·P. Hamilton·B. Harris·A. Hergenhan·M. Hernandez-Morquecho·C. James·R. S. Jones·M. Jung·T. Junk·D. Kalra·G. Karagiorgi·F. Kumar·L. Kashur·K. J. Kelly·W. Ketchum·M. J. King·J. Klein·L. Kotsiopoulou·I. Kreslo·T. Kroupová·V. A. Kudryavtsev·H. Lay·R. LaZur·J. -Y. Li·K. Lin·B. R. Littlejohn·L. Liu·D. Lorca·W. C. Louis·X. Luo·A. A. Machado·P. Machado·C. Mariani·F. Marinho·J. Marshall
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Abstract

The Short-Baseline Near Detector (SBND) is a liquid argon time projection chamber in Fermilab's Short-Baseline Neutrino Program, positioned 110 meters from the neutrino target along the Booster Neutrino Beam (BNB). In addition to its neutrino physics goals, SBND enables searches for new physics, including long-lived particles (LLPs) produced via neutrino-nucleus upscattering that decay into visible final states. Although neutrino data taking with the full SBND experiment began in December 2024, a subset of the Cosmic Ray Tagger (CRT) system operated from 2017--2018 as a standalone detector, referred to as the CRT Beam Telescope, collecting data corresponding to $2.95\times 10^{20}$ protons on target from the BNB. Originally intended for commissioning and performance studies, the substantial dataset collected also enables searches for displaced LLP decays. This paper presents the first search for physics beyond the Standard Model using data from the SBND CRT Beam Telescope, targeting LLP decays into electron-positron pairs. We observe no significant excess above the expected background and set 90% confidence-level upper limits on an effective production cross section at the level of $10^{-38}$ cm$^2$ for laboratory decay lengths of 0.3-100 m. These results complement existing searches by probing displaced decay signatures at meter-scale decay lengths.

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R. Acciarri, L. Aliaga-Soplin, D. Andrade Aldana, C. Andreopoulos, A. Antonakis, S. Balasubramanian, A. Barnard, V. Basque, J. R. Bateman, A. Beever, B. Behera, M. Betancourt, A. Bhat, M. Bishai, A. Blake, B. Bogart, D. Brailsford, A. Brandt, S. Brickner, M. B. Brunetti, G. A. N. Buzzard, L. Camilleri, D. Caratelli, D. Carber, B. Carlson, M. F. Carneiro, R. Castillo Fernandez, F. Cavanna, A. Chappell, H. Chen, S. Chung, R. Coackley, J. I. Crespo-Anadón, C. Cuesta, Y. Dabburi, O. Dalager, M. Dall'Olio, S. K. Das, M. Del Tutto, Z. Djurcic, V. do Lago Pimentel, S. Dominguez-Vidales, M. Donnachie, M. Dubnowski, K. Duffy, S. Dytman, A. Ereditato, E. Espinoza, J. J. Evans, A. C. Ezeribe, C. Fan, A. Filkins, B. Fleming, W. Foreman, D. Franco, G. Fricano, I. Furic, A. P. Furmanski, S. Gao, D. Garcia-Gamez, S. Gardiner, I. Gil-Botella, S. Gollapinni, P. Green, W. C. Griffith, L. Hagaman, P. Hamilton, B. Harris, A. Hergenhan, M. Hernandez-Morquecho, C. James, R. S. Jones, M. Jung, T. Junk, D. Kalra, G. Karagiorgi, F. Kumar, L. Kashur, K. J. Kelly, W. Ketchum, M. J. King, J. Klein, L. Kotsiopoulou, I. Kreslo, T. Kroupová, V. A. Kudryavtsev, H. Lay, R. LaZur, J. -Y. Li, K. Lin, B. R. Littlejohn, L. Liu, D. Lorca, W. C. Louis, X. Luo, A. A. Machado, P. Machado, C. Mariani, F. Marinho, J. Marshall. 2026-10-27. Search for Neutrino-Produced Long-Lived Particles Using the SBND Cosmic Ray Tagger Beam Telescope. https://arxiv.org/abs/2610.37555

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