Exploring Sterile Neutrinos and Their Impact on Long Baseline Experiments
Delve into the realm of sterile neutrinos and their influence on long baseline experiments, as young scientist Niki Klop sheds light on oscillations, motivations, and the intriguing anomalies observed in neutrino experiments. Explore the dynamic interplay between mass eigenstates, neutrino flavor transitions, and the quest to unravel the mysteries of neutrino oscillations.
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Presentation Transcript
Young scientist workshop, Ringberg castle 19-07-14 Impact of sterile neutrinos on long baseline experiments Niki Klop Ludwig-Maximilians University Munich Max Planck Institute for Physics Munich Supervisor: Antonio Palazzo
Outline oscillations in the standard framework Motivations for a sterile neutrino What I am doing 19-07-14 Niki Klop 2
Introduction In the Standard Model, neutrinos are massless Experiments have shown that neutrinos can change flavour Spectrum of 3 neutrino mass eigenstates Flavour states can be written as a superposition of mass eigenstates (and vice versa) 19-07-14 Niki Klop 3
Introduction Transition probability Only dependent of m2, not of the absolute mass. The sensitivity to m2 of an experiment is maximal for the values of m2 such that ~ 1 19-07-14 Niki Klop 4
Introduction The PMNS matrix Mixing angles are measured CP-violating phase still has to be determined LBL experiments (T2K) 19-07-14 Niki Klop 5
The T2K experiment 19-07-14 Niki Klop 6
Introduction The neutrino mass spectrum: normal hierarchy inverted hierarchy m2atm m2sol m2atm = m223 = 2.4 10-3 eV2 m2sol= m212 = 7.6 10-5 eV2 19-07-14 Niki Klop 7
Motivation Anomalies in short baseline (SBL) experiments: experiments for which L/E ~ 1 km/GeV ( m2~ 1 eV2 ) e appearance: LSND measured e appearance from beam consistent with mixing with m2~ 1 eV2 MiniBoone: rules out part of the LSND region _ _ 19-07-14 Niki Klop 8
Motivation e disappearance L/E ~ 1 m/MeV Reactor anomaly Mention et al. arXiv:1101:2755 19-07-14 Niki Klop 9
Motivation Introduction of a 4th neutrino with m2~ 1 eV2 4th neutrino should be sterile (must not couple to the standard electroweak current) Success of 3 should be preserved 4x4 mixing matrix 6 mixing angles, 3 CP-violating phases 19-07-14 Niki Klop 10
What I am doing If sterile neutrinos indeed exist, this will have both positive and negative effects on the efficiency of the LBL experiments Simulation of 3+1 neutrino oscillation in a LBL experiment (T2K) Goal: put LBL-experiments in a wider perspective. 3+1 case 19-07-14 Niki Klop 11
3 probability 0.06 Patm Psol Pint P 0.05 0.04 0.03 0.02 0.01 0 0 0.05 0.1 0.15 0.2 0.25 0.3 Sin(2 13) 0.35 19-07-14 Niki Klop 12
1 "plotje15.txt" 0.0008 2.69 NH Best fit 90% CL 3 (matter) 1 68% CL 0.5 0 -0.5 cp ( ) -1 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 1 "plotje15IH.txt" 0.0006 IH Best fit 90% CL 2.69 1 68% CL 0.5 0 -0.5 -1 0 0.05 0.1 0.15 0.2 0.25 0.3 Sin2(2 13) 0.35 0.4 19-07-14 Niki Klop 13
3 (vacuum) 1 "Chi2nieuw1.txt" 0.0008 cp ( ) Best fit 90% CL 2.69 1 68% CL DB I I 0.5 0 -0.5 -1 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 Sin2(2 13) 0.4 19-07-14 Niki Klop 14
4 probability 0.06 Patm Psol Pstr P1max P2max P3max P 0.05 0.04 0.03 0.02 0.01 0 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 Sin(2 e ) 0.18 0.2 19-07-14 Niki Klop 15
4results (vacuum) 1 1 "Chi2nieuw3.txt" 0.0008 "Chi2nieuw1.txt" 0.0008 Best fit 90% CL Best fit 90% CL 2.69 1 68% CL DBI I 2.69 1 68% CL DBI I 0.5 0.5 0 0 14 = /2 -0.5 -0.5 -1 -1 13 ( ) 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 1 1 "Chi2nieuw5.txt" 0.0008 "Chi2nieuw4.txt" 0.0008 Best fit 90% CL Best fit 90% CL 2.69 1 68% CL DBI I 2.69 1 68% CL DBI I 0.5 0.5 0 0 14 = - /2 14 = -0.5 -0.5 -1 -1 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 Sin2(2 13) 19-07-14 Niki Klop 16
Summary The standard 3 framework may be not complete Intriguing indications in the favour of light sterile neutrinos ~ 1 eV Large experimental activity on sterile Large theoretical activity on sterile I focus on impact of these sterile neutrinos in LBL experiments 19-07-14 Niki Klop 17
The T2K experiment 19-07-14 Niki Klop 18
