Future Directions in Parity Violation: From Quarks to the Cosmos

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Future Directions in Parity Violation From
Quarks to the Cosmos
many students, post-docs, collaborators, and
colleagues
PAVI 06 MHLOS
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Fundamental Symmetries Cosmic History
What are the fundamental symmetries that have
governed the microphysics of the evolving
universe?

• Parity violation as a probe of the
  protons internal structure (sea quarks, twist)
• Parity violation as probe of the hadronic weak
  interaction
• Parity violation as a probe of additional
  symmetries of the early universe

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Fundamental Symmetries Cosmic History
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Fundamental Symmetries Cosmic History
SM unfinished business
What is the internal landscape of the proton?
Sea quarks, gluons, qq, qqg correllations
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Probing the strange sea with PV
GMs 0.28 /- 0.20 GEs -0.006 /- 0.016 3
/- 2.3 of proton magnetic moment 20 /- 15
of isoscalar magnetic moment 0.2 /- 0.5 of
Electric distribution
Consistent with s-quark contributions to mP JP
but smaller than early theoretical expectations
Preliminary
Courtesy of Kent Pashke (U Mass)
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Probing Higher Twist Beyond the Parton Model
2xF1 Experimental Status
Data from JLab E94-110 (nucl-ex/0410027,
submitted to PRL) Courtesy C Keppel
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n 2 Cornwall-Norton Moments
F2
F2, F1 in excellent agreement with NNLO TM
above Q2 2 GeV2 No (or canceling) higher
twists Yet, dominated by large x and resonance
region Remove known HT (a bit novel), the
elastic, and there is no more down to Q2 0.5
GeV2 The case looks different for FL (data or
curve?)
2xF1
FL
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Probing Higher Twist with PV
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Fundamental Symmetries Cosmic History
SM unfinished business
How do weak interactions of hadrons reflect the
weak qq force ? Are QCD symmetries (chiral,
large NC,) applicable? Is there a long range
weak NN interaction?
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Weak Interactions of Hadrons Strange?
Hyperon weak decays
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Weak Interactions of Hadrons Strange?
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Weak Interactions of S0 Hadrons Strange?
What does QCD predict ?
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Weak Interactions of S0 Hadrons Strange?
Use parity-violation to filter out EM strong
interactions
Desplanques, Donoghue, Holstein (DDH)
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Is the weak NN force short range ?
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Is the weak NN force short range ?
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Hadronic PV Effective Field Theory
PV Potential
Long Range
Short Range
Medium Range
Zhu, Maekawa, Holstein, R-M, van Kolck 05 R-M
Page 06
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Hadronic PV Effective Field Theory
PV Current Operators
Long Range
Medium Range
Short Range
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Hadronic PV Few-Body Systems
Pionless theory
Ab initio few-body calcs
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Hadronic PV Theoretical Challenges
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Hadronic PV 0n bb - decay
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Hadronic PV 0n bb - decay
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Hadronic PV as a probe

• Determine VPV through O (p) from PV low-energy
  few-body studies where power counting works
• Re-analyze nuclear PV observables using this VPV

• If successful, we would have some indication
  that operator power counting works in nuclei
• Apply to 0nbb-decay

Prezeau, R-M, Vogel
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Fundamental Symmetries Cosmic History
Puzzles the Standard Model cant solve

• Origin of matter
• Unification gravity
• Weak scale stability
• Neutrinos

What are the symmetries (forces) of the early
universe beyond those of the SM?
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PV as a Probe of New Symmetries
Puzzles the Standard Model cant solve

• Origin of matter
• Unification gravity
• Weak scale stability
• Neutrinos

What are the implications of mn and PV expts for
possible new symmetries forces?
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PV as a Probe of New Symmetries
Unseen Forces Supersymmetry ?

• Unification gravity
• Weak scale stability
• Origin of matter
• Neutrinos

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PV Correlations in Muon Decay mn
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PV Correlations in Muon Decay mn
Model Independent Analysis
2005 Global fit Gagliardi et al.
Model Dependent Analysis
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Weak decays new physics
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Weak decays PV
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Weak decays PV
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Weak decays PV Correlations
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Probing SUSY with PV eN Interactions
??? SUSY dark matter
?? -gt e??e
Kurylov, Su, MR-M
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Probing SUSY with PV eN Interactions
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Probing SUSY with PV eN Interactions
Kurylov, R-M, Su
??? SUSY dark matter
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Fundamental Symmetries Cosmic History
Baryogenesis When? SUSY? Neutrinos? CPV?
WIMPy D.M. Related to baryogenesis?
New gravity? Lorentz violation? Effects on CMB?
?
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What is the origin of baryonic matter ?
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Baryogenesis New Electroweak Physics
90s Cohen, Kaplan, Nelson
Joyce, Prokopec, Turok
Unbroken phase
CP Violation
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EDM Probes of New CP Violation
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Baryogenesis Dark Matter MSSM
Chargino Mass Matrix
Neutralino Mass Matrix
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EDM constraints SUSY CPV
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Dark Matter Future Experiments
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EDMs, Baryogenesis, Dark Matter

• Continued progress in performing
  systematic computations of the baryon asymmetry
• Continued scrutiny of QCD nuclear
  structure uncertainties in EDM computations
• Comprehensive phenomenology with other models
  of new CPV (extended Higgs sector)
• Funding for experiments !

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Future Directions

• Parity violation in electron scattering and
  hadronic interactions will continue to provide
  new insights into protons internal structure
  and weak qq interactions
• PV in weak decays and electron scattering will
  continue to provide insights into new physics
  (SUSY, ns, Higgs) that will complement LHC, ILC
  probes
• PVTV will provide powerful probe of the origin
  of baryonic matter and non-baryonic dark matter

Considerable theoretical and experimental
challenges and opportunities remain PAVI must
go on!