Nuclear Science & the New Standard Model: Neutrinos & Fundamental Symmetries in the Next Decade Michael Ramsey-Musolf, INPC 2007 Fifty years of PV in nuclear physics Nuclear physics studies of s & fundamental symmetries played an essential role in developing & confirming the Standard Model Our role has been broadly recognized within and beyond NP Solar s & the neutrino revolution The next decade presents NP with a unique opportunity to build on this legacy in developing the “new Standard Model” The value of our contribution will be broadly recognized outside the field QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture.
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Nuclear Science & the New Standard Model: Neutrinos & Fundamental Symmetries in the Next Decade
The next decade presents NP with a unique opportunity to build on this legacy in developing the “new Standard Model” The value of our contribution will be broadly recognized outside the field. - PowerPoint PPT Presentation
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Nuclear Science & the New Standard Model: Neutrinos & Fundamental Symmetries in the Next Decade
Michael Ramsey-Musolf, INPC 2007
Fifty years of PV in nuclear physics
Nuclear physics studies of s & fundamental symmetries played an essential role in developing & confirming the Standard Model
Our role has been broadly recognized within and beyond NP
Solar s & the neutrino revolution
The next decade presents NP with a unique opportunity to build on this legacy in developing the “new Standard Model”
The value of our contribution will be broadly recognized outside the field
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Fundamental Symmetries & Cosmic History
Beyond the SM SM symmetry (broken)
Electroweak symmetry breaking: Higgs ?
Fundamental Symmetries & Cosmic History
Standard Model puzzles Standard Model successes
to explain the microphysics of the present universe
It utilizes a simple and elegant symmetry principle
SU(3)c x SU(2)L x U(1)Y
• Big Bang Nucleosynthesis (BBN) & light element abundances
• Weak interactions in stars & solar burning
• Supernovae & neutron stars
Fundamental Symmetries & Cosmic History
Beyond the SM SM symmetry (broken)
Electroweak symmetry breaking: Higgs ?
Puzzles the Standard Model can’t solve
1. Origin of matter2. Unification & gravity
3. Weak scale stability4. Neutrinos
What are the symmetries (forces) of the early universe beyond those of the SM?
• Supersymmetry ?• New gauge interactions?• Extra dimensions ?
Opportunity: Unique role for low energy studies in the LHC era
Two frontiers in the search for new physics
Collider experiments (pp, e+e-, etc) at higher energies (E >> MZ)
High energy physics
Particle, nuclear & atomic physics
CERN
Ultra cold neutronsLarge Hadron Collider
Indirect searches at lower energies (E < MZ) but high precision
(and beyond!)
Primary Scientific Questions
• What are the masses of neutrinos and how have they shaped the evolution of the universe? decay, 13, decay,…
• Why is there more matter than antimatter in the present universe? EDM, DM, LFV, , 13 …
• What are the unseen forces that disappeared from view as the universe cooled? Weak decays, PVES, g-2,…
Tribble report
• Major Discovery Potential:
-decay & EDM• Precision measurements
Neutrino mixing & hierarchy
Weak decays, PVES, g-2• Electroweak probes of QCD
PVES, Hadronic PV, N scatt…
Specific Opportunities
The Origin of Matter & Energy
Beyond the SM SM symmetry (broken)
Electroweak symmetry breaking: Higgs ?
Cosmic Energy Budget
?
Baryogenesis: When? CPV? SUSY? Neutrinos?
Nuclear Science mission: explain the origin, evolution, & structure of the baryonic component
Leptogenesis: discover the ingredients: LN- & CP-violation in neutrinos
Weak scale baryogenesis: test experimentally: EDMs
Baryogenesis: Ingredients
Sakharov Criteria
• B violation
• C & CP violation
• Nonequilibrium dynamics
Sakharov, 1967
Present universe Early universe
Weak scale Planck scale
log10(μ / μ0)
€
αS−1
€
αL−1
€
αY−1
??
Leptogenesis
Present universe
Planck scale
log10(μ / μ0)
€
αS−1
€
αY−1
Leptogenesis
Early universe
Weak scale
Key Ingredients
• Heavy R
• m spectrum
• CP violation
• L violation
Out of equilibrium decays
Particle-Antiparticle asym
L violation B violation
0 -decay,,
-decay, 13 ,…
-Decay: LNV? Mass Term?
€
e−
€
e−
€
M
€
W −
€
W −
€
A Z,N( )
€
A Z − 2,N + 2( )0.1
1
10
100
1000
Effective
( )Mass meV
12 3 4 5 6 7
12 3 4 5 6 7
12 3 4 5 6 7
1 ( )Minimum Neutrino Mass meV
U1e = .866 δm2
sol = 7 meV
2
U2e = .5 δm2
atm = 2 meV
2
U 3e =
Inverted
Normal
Degenerate
Dirac Majorana
-decayLong baseline
?
?
Theory Challenge: matrix elements+ mechanism
€
mν
EFF= Uek
2mk e2iδ
k
∑
€
e−
€
e−
€
χ 0
€
˜ e −
€
u
€
u
€
d
€
d
€
˜ e −€
e−
€
e−
€
M
€
W −
€
W −
€
u
€
u
€
d
€
d
Mechanism & m
0.1
1
10
100
1000
Effective
( )Mass meV
12 3 4 5 6 7
12 3 4 5 6 7
12 3 4 5 6 7
1 ( )Minimum Neutrino Mass meV
U1e = .866 δm2
sol = 7 meV
2
U2e = .5 δm2
atm = 2 meV
2
U 3e =
Inverted
Normal
Degenerate signal equivalent to degenerate hierarchy
Loop contribution to m of inverted hierarchy scale
Impt to know if RPV interactions exist and, if so, what magnitude