Neutrino Masses and the Quest for Neutrino Masses and the Quest for Unification Unification K.S. Babu K.S. Babu Oklahoma State University Oklahoma State University Physics Seminar Physics Seminar Wichita State University, Wichita, KS Wichita State University, Wichita, KS November 6, 2013 November 6, 2013
Neutrino Masses and the Quest for Unification. K.S. Babu Oklahoma State University. Physics Seminar Wichita State University, Wichita, KS November 6, 2013. Cosmic Gall Neutrinos, they are very small. They have no charge and have no mass And do not interact at all. - PowerPoint PPT Presentation
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Neutrino Masses and the Quest for UnificationNeutrino Masses and the Quest for Unification
K.S. BabuK.S. Babu
Oklahoma State UniversityOklahoma State University
Physics SeminarPhysics Seminar
Wichita State University, Wichita, KSWichita State University, Wichita, KS
November 6, 2013November 6, 2013
Cosmic Gall
Neutrinos, they are very small. They have no charge and have no
mass And do not interact at all.
The earth is just a silly ball To them, through which they
simply pass, Like dustmaids down a drafty hall
Or photons through a sheet of glass.
They snub the most exquisite gas, Ignore the most substantial wall, Cold-shoulder steel and sounding
brass, Insult the stallion in his stall.
And, scorning barriers of class, Infiltrate you and me! Like tall
And painless guillotines, they fall Down through our heads into the
grass.
At night, they enter at Nepal And pierce the lover and his lass
From underneath the bed—you call It wonderful; I call it crass.
John Updike Telephone Poles and Other Poems,
1963
• Postulated by Pauli as a desperate measure to restore momentum and energy conservation in beta decay (1930)
• Electron type neutrino discovered by Reines and Cowan in reactor experiments (1956) -- Nobel Prize in 1995
• Muon type neutrino produced in accelerators by Lederman, Schwartz, Steinberger et al (1962) – Nobel Prize in 1988
• LEP experiments measure N(nu) = 2.994 +-0.012 (1991-2002)• Neutrinos from the Sun detected by Davis et al (1968) – Nobel Prize in
2002• Neutrinos from Supernova 1987A detected in US and Japan -- Koshiba,
Nobel Prize in 2002• Neutrino oscillations discovered in atmospheric neutrinos [IMB,
Kamiokonde Hints (1988), Discovery by SuperKamiokande (1998)]• Solar neutrino deficit confirmed by various experiments and interpreted as
evidence for neutrino oscillations (1968 –)• Reactor antineutrino oscillations discovered – Daya Bay (2012), RENO,