precision tests

Precision Tests

• Weak Decays

• Neutral Current Processes

• Muon g-2

Nuclei & Charged Leptons

PV Electron ScatteringQuickTime™ and a

TIFF (Uncompressed) decompressorare needed to see this picture.

Weak DecaysQuickTime™ and a

TIFF (Uncompressed) decompressorare needed to see this picture.• n decay correlations

• nuclear decay

• pion decays

• muon decays

• Q-Weak • 12 GeV Moller• PV DIS

Muons

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

• g-2

• A->eA

VI. Weak Decays

• -decay: CKM unitarity & correlations

• Pion leptonic decay

• Muon decay

Weak decays: SM old & new

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b → u e− ν e

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Weak decays & SUSY

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symmetric

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Chiral ( ) Rotation

One solution: af ~ Yf

Triscalar interactions

Weak decays & SUSY : Correlations

Chiral symmetry breaking in SUSY

Mass suppressed symmetry breaking: “alignment” models

Large symmetry breaking: New SUSY models

Future exp’t ?

Profumo, R-M, Tulin

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VII. Neutral Currents

• Parity-violating electron scattering (PVES)

• Muon g-2

Nuclei & Charged Leptons: PV




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• nuclear decay

• pion decays

• muon decays


Muons



• g-2

• A->eA

Lepton Scattering & New Symmetries

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Enhanced transparency to new physics

Small QCD uncertainties (Marciano & Sirlin; Erler & R-M)

QCD effects (s-quarks): measured (MIT-Bates, Mainz, JLab)

QW and SUSY Radiative Corrections

Tree Level

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Flavor-dependent

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Weak Charge & Weak Mixing

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Weak Mixing in the Standard Model

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JLab Future

SLAC Moller

Parity-violating electron scattering

Z0 pole tension

Nuclei & Charged Leptons: Theory




Muons



• g-2

• A->eA

Essential Role for Theory

• Precise SM predictions (QCD)

• Sensitivity to new physics & complementarity w/ LHC

• Substantially reduced QCD uncertainty in sin2W running

• QCD uncertainties in ep box graphs quantified

• Comprehensive analysis of new physics effects

e p e p e p

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• n decay correlations

• nuclear decay

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• muon decays

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12 GeV

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Kurylov, RM, Su

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Global fit: MW, APV, CKM, πl2,…

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SM SM

€

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The Big Picture

Fifty years of PV in nuclear physics

Nuclear physics studies of νs & fundamental symmetries played an essential role in developing & confirming the Standard Model

Our role has been broadly recognized within and beyond NP

Solar νs & the neutrino revolution

The next decade presents NP with a historic opportunity to build on this legacy in developing the “new Standard Model”

The value of our contribution will be broadly recognized outside the field

References

• “ Low Energy Precision Test of Supersymmetry”, M.J. Ramsey-Musolf & S. Su, Phys.Rept.456:188, 2008, e-

Print: hep-ph/0612057Model”

• “Low energy tests of the weak interaction”, J. Erler & M. J. Ramsey-Musolf , Prog.Part.Nucl.Phys.54:351 442, 2005, e-Print: hep-ph/0404291

Plus many references therein…

Precision Probes of New Symmetries

Beyond the SM SM symmetry (broken)

Electroweak symmetry breaking: Higgs ?

New Symmetries

1. Origin of Matter2. Unification & gravity

3. Weak scale stability4. Neutrinos

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?

LHC: energy frontier

Low-energy: precision frontier

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Thank you !

• Precision studies and symmetry tests with neutrons are poised to discovery key ingredients of the new Standard Model during the next decade

• Physics “reach” complements and can even exceed that of colliders: dn~10-28 e-cm ; δO/OSM ~ 10-4

• Substantial experimental and theoretical progress has set the foundation for this era of discovery

• The precision frontier is richly interdisciplinary: nuclear, particle, hadronic, atomic, cosmology

To the organizers, staff, and participants for a lively and productive school




are needed to see this picture.QuickTime™ and a

decompressorare needed to see this picture.



+ …….

Back Matter

• Weak Decays

• Neutral Current Processes

• Muon g-2

Deep Inelastic PV: Beyond the Parton Model & SM

12 GeV 6 GeV

e-

N X

e-

Z* γ*

d(x)/u(x): large x Electroweak test: e-q couplings & sin2W

Higher Twist: qq and qqg correlations

Charge sym in pdfs

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d p (x) = un (x)?

Nuclei & Charged Leptons: Theory






• nuclear decay

• pion decays

• muon decays




Muons



• g-2

• A!eA




γ

W

ν e p

e− n

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l

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Reduced QCD error: Marciano & Sirlin

Reduced QCD error: Cirigliano & Roselle

SUSY effects in weak decays

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mν implications for NP in weak decays

Vud & CKM Unitarity Ongoing theory for weak decays:

• Further reductions in QCD errors?

• Impact on Extra Dim scenarios ?

• Implications of LHC results ?

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r p ν

Ee Eν

+ Ar σ n ⋅

r p eE e

+ L

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mν

Neutrino correlation

SUSY: Observable E-dependence implies super heavy non-SM Higgs

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RM et al

Pion leptonic decays

SUSY: Observable deviation could imply large slepton mass splittings

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Muon Decay: Michel Parameters

3/4

0

3/4

1

TWIST (TRIUMF)

Correlations in Muon Decay & mν

Model Independent Analysis

constrained by mν

Model Dependent Analysis

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Also -decay, Higgs production

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Constraints on non-SM Higgs production at ILC:

mν , and decay corr

Muon Anomalous Magnetic Moment

γ

QED

Z

Weak Had LbL

Had VP

π

SUSY Loops



SM Loops

Future goal



~ 3.4 !

Nuclei & Charged Leptons: Theory III






• nuclear decay

• pion decays

• muon decays




Muons



• g-2

• A!eA




γ

QED

Z

Weak

Had LbL

Had VP

π

SUSY Loops: Sign of Higgsino mass



Ongoing theory for g-2:

• Further reductions in had LBL uncertainty?

• Impact on Extra Dim scenarios ?

Had VP: Disp Rel & e+e-

Lattice QCD (T Blum)

Had LBL: ChPT Hadronic Models Lattice QCD?

precision tests

Documents

weak decaysdecay

r parityviolationweak

sm old newweak decays

weak interaction

new symmetries parity

new standard model

new vus tn

electron scatteringqw