Short-Baseline Neutrino (SBN) Program

Short-Baseline Neutrino (SBN) Program
Name	Short-Baseline Neutrino (SBN) Program
Location	Fermilab
Established	2015
Type	Particle physics experiment
Participants	* Argonne National Laboratory * Brookhaven National Laboratory * California Institute of Technology * Columbia University * Cornell University * Dartmouth College * Fermi National Accelerator Laboratory * Harvard University * Indiana University * Iowa State University * Los Alamos National Laboratory * Lawrence Berkeley National Laboratory * Massachusetts Institute of Technology * Michigan State University * New York University * Northwestern University * Ohio State University * Oxford University * Princeton University * Rutgers University * Stanford University * University of California, Berkeley * University of Chicago * University of Oxford * University of Rochester * University of Pennsylvania * University of Michigan * University of Texas at Austin * University of Illinois Urbana–Champaign

Short-Baseline Neutrino (SBN) Program The Short-Baseline Neutrino program at Fermilab is a coordinated set of accelerator-based particle physics experiments employing liquid argon time projection chambers near the Booster Neutrino Beam to study neutrino properties, anomalous signals, and detector technologies. The program integrates multiple detector modules and international institutions to address questions raised by prior measurements such as those from LSND and MiniBooNE, while developing capabilities relevant to Deep Underground Neutrino Experiment and broader neutrino physics efforts.

Overview

The program was conceived to test sterile neutrino interpretations of anomalies reported by LSND and MiniBooNE and to refine measurements of coherent and inelastic processes using LArTPC technology. It operates on the Booster Neutrino Beam at Fermilab with an array of detectors placed at differing baselines, coordinating with experiments and institutions such as MicroBooNE, ICARUS, SBND, NOvA, MINOS, T2K, and Super-Kamiokande in the global neutrino community.

Experimental Setup and Detectors

The SBN detector suite comprises multiple LArTPC modules: SBND as the near detector, MicroBooNE as the intermediate detector, and ICARUS as the far detector. These detectors are positioned along the Booster Neutrino Beam line to provide comparative flux and cross-section measurements, leveraging technologies developed at CERN and by collaborations including Università di Padova and University of Bern. The detectors incorporate high-voltage systems, cryogenics derived from work at Fermilab and LBNL, photon detection systems similar to those used in DUNE prototypes, and reconstruction software influenced by frameworks from ROOT-based analyses at CERN and SLAC National Accelerator Laboratory.

Physics Goals and Research Topics

Primary goals include searching for light sterile neutrino states indicated by anomalies from LSND and MiniBooNE, measuring neutrino-argon interaction cross sections relevant to DUNE, and improving particle identification for electron and muon neutrino channels to resolve backgrounds. The program addresses oscillation parameter space overlapping with evidence from Reactor Antineutrino Anomaly experiments and global fits involving results from KATRIN, SAGE, GALLEX, Daya Bay, and Double Chooz. It also studies neutrino-induced single-photon production, coherent pion production, and final-state interactions informed by models from GENIE, NuWro, and GiBUU.

Data Collection and Analysis Methods

Data acquisition relies on continuous readout and triggering synchronized with the Booster Neutrino Beam spill, using calibration procedures developed at Argonne National Laboratory and analysis toolchains shared with MicroBooNE and ICARUS teams. Reconstruction uses pattern-recognition algorithms and machine-learning techniques influenced by work from Google AI groups, University of Oxford computer vision groups, and software practices from CERN; systematic uncertainties are constrained via near-far comparisons analogous to methods used by Daya Bay and T2K. Blind-analysis strategies, Monte Carlo simulation campaigns, and global data combinations incorporate results and tools used by NOvA, MINOS, and Super-Kamiokande.

Key Results and Findings

Published analyses from the detector array have provided high-resolution measurements of neutrino-argon interactions, constrained sterile neutrino parameter space disfavoring portions suggested by LSND and MiniBooNE, and improved understanding of single-photon backgrounds that were central to the MiniBooNE anomaly debate. Results have been compared with cross-section datasets from MINERvA, T2K, and MicroBooNE and have influenced oscillation fits conducted by groups at Fermilab, Caltech, and Oxford. The program's measurements have also advanced LArTPC calibration and reconstruction practices adopted by DUNE and prototype efforts coordinated with CERN test-beam programs.

Collaboration and Funding

The collaboration brings together universities and national laboratories across North America, Europe, and Asia, including major contributors such as Fermilab, CERN, Brookhaven National Laboratory, Los Alamos National Laboratory, Lawrence Berkeley National Laboratory, TRIUMF, University of Geneva, and numerous academic institutions. Funding and oversight come from agencies like the U.S. Department of Energy, National Science Foundation, European Research Council, and national funding bodies aligned with partners at INFN, STFC, NSERC, and CNRS.

Future Plans and Upgrades

Future directions include continued data taking to reduce statistical uncertainties, upgrades to photon detection and electronics systems informed by DUNE design work, and integration of improved simulation frameworks developed with partners at CERN and SLAC National Accelerator Laboratory. The collaboration plans cross-experiment analyses with DUNE, joint workshops with T2K and NOvA, and upgrades to cryogenics and readout motivated by results from ICARUS refurbishment and prototype programs at LBNL. These efforts aim to refine oscillation constraints, support next-generation long-baseline experiments, and enhance global neutrino physics programs involving institutions such as Princeton University, Harvard University, and MIT.

Category:Neutrino experiments