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Leptophilic Dark Matter & The Magnetic Moment of the Muon

Leptophilic Dark Matter & The Magnetic Moment of the Muon . May 6 2014. with Zackaria Chacko & Prateek Agrawal h ep-ph:1402.7369. Dark Matter. Characteristics still unknown. Leptophilic Bounds. Tree level scattering through renormalizable couplings with leptons only. Fewer photons.

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Leptophilic Dark Matter & The Magnetic Moment of the Muon

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  1. Leptophilic Dark Matter &The Magnetic Moment of the Muon May 6 2014 with ZackariaChacko & PrateekAgrawal hep-ph:1402.7369

  2. Dark Matter Characteristics still unknown

  3. Leptophilic Bounds • Tree level scattering through renormalizable couplings with leptons only Fewer photons Hadron Collider Electrons are light

  4. Leptophilic DM • Charged mediator carries flavor

  5. Anomalous Magnetic Momentof the Muon • Or, (Exp)(Thy)

  6. agrees with experiment to • New Physics contribution if only lepton mass breaks chirality • is times more sensitive to new physics than • Naively sets a scale for physics that removes the anomaly, ~150 GeV

  7. Experiment J-PARC Brookhaven Fermilab E821 E989 E34 Experiments expect to reduce uncertainty by a factor of 4

  8. Charged Mediators • Categorize by spin of the DM • Use the notation • As well as and • Example: Spin 0 DM

  9. Neutral Mediators • Spin 0: • Spin 1:

  10. Comparison Bounds • LEP • Monophoton • Fermionic DM only • Compositeness • Neutral Mediators Only • Direct Detection • LUX • Effective Operator Analysis

  11. Scalar DM Results • 2 σ blue band Only for Complex Scalar • Purple:600 Gev • Green: 400 GeV • Black: 250 GeV • For λ~1 the scale is ~100 GeV • Expect LEP bounds to disfavor entire band

  12. Scalar DM with Neutral Mediator Only for Complex Scalar • For λ~1 the scale is ~100 GeV in unexcluded region

  13. Fermionic DM Dirac • Charged Vector Mediator • Neutral Vector Mediator • For λ~1 scale is ~ 100 GeV Majorana Dirac Only

  14. Conclusions • Leptophilic DM has potential to solve the anomaly • Charged mediator models that preserve chiral symmetry require mediator masses less than a few hundred GeV for ~1 couplings • A few windows aside, these models are tightly constrained by experiment • Viable Leptophilic Wimps may require chiral symmetry breaking interactions

  15. Extras

  16. Direct Detection Bounds • Use LUX bounds and effective operators

  17. LEP Bounds • Assume universal coupling to leptons • P. J. Fox, R. Harnik, J. Kopp,Y. Tsai, Phys. Rev. D 84, 014028 (2011) • Only Fermionic DM formonophoton (so far) • Compositeness bounds for neutral mediators

  18. Indirect Detection • Y. Bai and J. Berger hep-ph/1402.6696

  19. Relic Abundance • Y. Bai and J. Berger hep-ph/1402.6696

  20. g-2 Theory  • QED • 4-loop calculation & 5-loop estimation • Weak • 2-loop • Hadronic Vacuum polarization • Kind of. (Optical Theorem) • Dominates error • Hadronic Light by Light • Error Runner up   X

  21. Direct Detection • DM couples to atomic electrons • Momentum transfer from DM is tiny • J. Kopp, V. Niro, T. Schwetz, and J. Zupan, Phys. Rev. D 80, 083502 (2009)

  22. Direct Detection Operators • Real Scalar: None • Complex Scalar: • MajoranaFermion:None • Dirac Fermion: • Real Vector: None

  23. LEP Compositeness • Only neutral mediator models bounded

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