New results from neutrino oscillation experiments
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Transcript of New results from neutrino oscillation experiments
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New results from neutrino oscillation experiments
Michel Gonin – Ecole Polytechnique – France
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1987 : SUPER NOVA SN1987A
Super-Kamiokande
The experiments
New results on Θ13
Perspectives
Introduction neutrino oscillations
mixing matrices
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New results on neutrino oscillations
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The Standard Model of Particle Physics
26 free parameters including 8 for neutrinos
electron
neutrino
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The Mixing Matrix
c = cos s = sin
?≈
The last mixing angle 13 was missing before
2012
The complex phase δ is still unknow
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Measurements of the matrix elements
θ12 = 33.6◦ ± 1.0◦
θ23 = 45◦ ± 6◦
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CP violation δ 0
"for the discovery of the origin of the broken symmetry which predicts the existence of at least three families of quarks in nature".
3 generations of particles
3 mixing angles, all different from zero.
masse states flavor states
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World (new) baseline oscillation experiments
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nm beam Intense beam Near detectors
Huge far detector
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sin2213nm disappearance
Dm232
sin2223
ne appearance
T2K main physics goals
Probe νμ to νe oscillations with sensitivity improvement
Precise measurement of the “atmospheric” parameters 23, Dm32
2
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How do we detect
neutrinos ?
Neutrino interaction with some unrelated muon (“rock muon”)
Charge current quasi elastic neutrino interaction
n p e ne
ne n p e
nm n p m
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Feb. 3, 2009Target Station
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Feb. 3, 2009Horns
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16
Inside the decay tunnel
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Non accelerator experiments (reactor)
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Exclusion for non zero - number of sin2(213)
“appearance”
θ13 = 9.1◦ ± 0.6◦ 2010 - 2012
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ne appearance
Discovery of neutrino appearance in flavor oscillations
New results
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New results
ne disappearance
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New results 2013
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First indication for strong CP violation in the lepton sector ?
New results 2013
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NOVACP
phase δ
Perspectives
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Is CP violated “strongly” in neutrino oscillation ?
Is the source of the violation due to complex phase associated with 3 generations ?
Only 3 generations for leptons ? Sterile neutrinos ?
Unitary triangle and physics beyond the standard model
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High power accelerator and huge detector needed
Asymmetry of neutrino and anti-neutrino induced by interaction in matter is large
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11February, 2004
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Measurement of 13
C=cos S=sin
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Merci beaucoup Joe !