威海(3).pdf

Neutrino Physics 1
Zhi-zhong Xing
(IHEP, Beijing)
Lecture A:
Neutrino’s history and lepton family

Lecture B:
Neutrino masses and flavor mixing

Lecture C:
Neutrino oscillation phenomenology

Lecture D:
Selected topics on cosmic neutrinos
@ Weihai High Energy Physics School, 2—10/8/2015
What is -oscillation? 2
Oscillation — a spontaneous periodic change from one neutrino flavor
state to another, is a spectacular quantum phenomenon. It can occur
as a natural consequence of neutrino mixing.
In a neutrino oscillation experiment, the neutrino beam is produced
and detected via the weak charged-current interactions.
Pure weak state  1,2,3 Pure weak state
three distinct neutrino mass
  states (matter waves) travel  
& interfere with one another
For example:  e beam :  decay;   beam :  decay;  beam : D decay
How to calculate? 3
Boris Kayser (hep-ph/0506165): This change of neutrino flavor is a
quintessentially quantum-mechanical effect. Indeed, it entails some
quantum-mechanical subtleties that are still debated to this day.
However, there is little debate about the “bottom line” ------- the
expression for the flavor-change probability……
Typical References:
. Giunti, Kim, “Fundamentals of Neutrino
Physics and Astrophysics” (2007)
. Cohen, Glashow, Ligeti: “Disentangling
Neutrino Oscillations” ()
. Akhmedov, Smirnov: “Paradoxes of
Neutrino Oscillations” ()
Our strategy: follow the simplest way
(which is conceptually ill) to derive the
“bottom line” of neutrino oscillations:
the leading-order formula of neutrino
oscillations in phenome