Group leader: Roxanne Guenette

Neutrino candidate from MicroBooNE (selected using automated reconstruction)

The MicroBooNE experiment has recently built a large (170t) liquid Argon Time Projection Chamber (LArTPC). The detector is located in the Booster Neutrino Beam (BNB) line at Fermilab USA. In October 2015, MicroBooNE successfully recorded its first neutrino data and has been taking data since then. The main physics goal of the MicroBooNE experiment is to investigate the puzzling low energy excess observed by the previous MiniBooNE experiment. In addition, MicroBooNE will also measure low energy neutrino cross sections, which are of great interest to the next generation of neutrino experiments. MicroBooNE is now in detector commissioning phase.

The MicroBooNE detector also serves as necessary next step in the vast LAr development programme towards the construction of multi-kilo ton LArTPC detectors. MicroBooNE will demonstrate the possibility of maintaining high purity in large vessels, the use of cold electronics immersed in LAr and the feasibility of running such detectors on or near the surface.

MicroBooNE physics
The main scientific goal of MicroBooNE is to investigate the low energy excess observed by MiniBooNE (ref). This previous Fermilab experiment has detected an unexpected excess of electron-neutrino-like events at low energies (200 to 475 MeV) that cannot be explained. The unique capability of electron/photon separation of the MicroBooNE detector will demonstrate if the excess comes from electron-neutrinos or an unidentified background of photons. Answering this surprising result is crucial for neutrino physics since it could shed light on the hypothetical sterile neutrino.

MicroBooNE will also perform several neutrino cross-section measurements in the GeV regime. This energy range is extremely important for the next generation of LAr neutrino detectors since cross-section uncertainties are one of the dominant systematics for these experiments.

Finally, MicroBooNE will be sensitive to any potential supernova in our Galaxy.