New search for a sterile neutrino at MicroBooNE with BNB and NuMI beams

18 Jun 2024, 17:30
2h
Near Aula Magna (U6 building) (University of Milano-Bicocca)

Near Aula Magna (U6 building)

University of Milano-Bicocca

Piazza dell’Ateneo Nuovo 1, Milano, 20126
Poster Sterile neutrinos Poster session and reception 1

Speakers

Sergey Martinenko (Brookhaven National Laboratory) Xiangpan Ji (Nankai University)

Description

In 2023, the MicroBooNE experiment published its first constraints on light sterile neutrino oscillations using neutrinos from the on-axis Booster Neutrino Beam (BNB). A limitation of this first result came from the cancellation between electron neutrino disappearance and muon neutrino to electron neutrino appearance oscillations leading to a degeneracy in the extracted oscillation fit parameters. A new search for a sterile neutrino is being carried out simultaneously using neutrinos from both the on-axis BNB at a baseline of ~470 m with mean neutrino energy at 800 MeV and the off-axis Neutrino from the Main Injector (NuMI) beam at a baseline of ~680 m with neutrinos up to a few GeV. MicroBooNE’s two beam measurement allows to break this degeneracy leveraging the different intrinsic electron neutrino to muon neutrino ratios in BNB (~0.5%) and NuMI (~5%). This significantly expands the experiment’s sensitivity, allowing to probe parameter space for test the sterile neutrino hypothesis compatible with short baseline anomalies from the LSND, Neutrino-4, Gallium, and BEST experiments. In this poster, the status of this analysis will be reported.

Poster prize Yes
Given name Xiangpan
Surname Ji
First affiliation Nankai University
Institutional email xji@bnl.gov
Gender Male
Collaboration (if any) MicroBooNE

Primary authors

Sergey Martinenko (Brookhaven National Laboratory) Xiangpan Ji (Nankai University)

Presentation materials