物理工学コースからのおしらせ

講師：香取哲平 (Queen Mary University of London)

演題：Physics of neutrino interactions around 1-10 GeV
日時：8月3日(金) 13:00～
場所：工学研究院　総合研究棟　W701室

Neutrinooscillation physics has been entered in the precision era. In this context accelerator-based neutrino experiments need a reduction of systematic errors to the level of a few percent. Today one of the most important sources of systematic errors are neutrino-nucleus cross sections which in the hundreds-MeV to few-GeV energy region are known with a precision not exceeding 10-20%. In this talk, I will review the main processes of neutrino-nucleus interactions in this energy region, and describe state-of-the-art theoretical work and open questions.
ポスターはこちらをご覧ください。



講師：香取哲平 (Queen Mary University of London)

演題：Observation of a Significant Excess of Electron-Like Events in the MiniBooNE Short-Baseline Neutrino Experiment
日時：8月3日(金) 15:00～
場所：工学研究院　総合研究棟　W701室

TheMiniBooNEexperiment at Fermilabreports results from an analysis of electron neutrino (ν_e) appearance data from 1.3 × 10²¹ protons on target (POT) in neutrino mode, an increase of approximately a factor of two over previously reported results (PRL110(2013)161801). A ν_e charged-current quasi-elastic (CCQE) event excess of 381.2 ± 85.2 events (4.5 σ) is observed in the energy range 200 < E_ν^QE < 1250 MeV.
Combining these data with the electron anti-neutrino (ν_e) appearance data from 1.1 × 10²¹ POT in antineutrino mode, a total ν_e plus ν_e CCQE event excess of 460.5 ± 95.8 events (4.8 σ) is observed. If interpreted in a standard two-neutrino oscillation model (ν_μ → ν_e), the best oscillation fit to the excess has a probability of 20.1% while the background-only fit has a χ²-probability of 5 × 10^-7 relative to the best fit. All of the major backgrounds are constrained by in-situ event measurements, so non-oscillation explanations would need to invoke new anomalous background processes. Although the data are fit with a standard oscillation model, other models may provide better fits to the data.
https://arxiv.org/abs/1805.12028
ポスターはこちらをご覧ください。

どなたでも参加できます。お気軽にご参加下さい。