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Q: Is dark matter relevant to weak scale physics? A: Likely.

Dark matter and normal matter have been wrenched apart by the tremendous collision of two large clusters of galaxies. The discovery, using NASA's Chandra X-ray Observatory and other telescopes, gives direct evidence for the existence of dark matter.

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Q: Is dark matter relevant to weak scale physics? A: Likely.

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  1. Dark matter and normal matter have been wrenched apart by the tremendous collision of two large clusters of galaxies. The discovery, using NASA's Chandra X-ray Observatory and other telescopes, gives direct evidence for the existence of dark matter.

  2. Q: Is dark matter relevant to weak scale physics? A: Likely. Q: If yes, where to insert dark matter sector?A: Most likely in Higgs sector because success of standard model of particle physics permits naturally the additional sector in Higgs sector.

  3. Scalar Cold Dark Matter (CDM) and Higgs Boson Hep-ph/0601224 Hep-ph/0512055 (EPJC2006) 朱守华（Shou-hua Zhu） Peking University

  4. I: Light (~mw) new freedom could exist in Higgs sector

  5. Existence of CDM is well-established(?) and we know:

  6. But we don’t know: Which particle is CDM? Neutralino in SUSY models? (SM gauge group) singlet scalar?

  7. Scalar cold dark matter model: Assume: (simplest model)

  8. In simplest cold dark matter model:

  9. Relic density of CDM (standard procedure): SM particles: ff-bar WW(*) ZZ(*)

  10. Calculation of CDM relic density: C. Burgess etal, NPB619(2001)709

  11. Allowed region

  12. Relic density of DM + Higgs mass lower and upper bounds => So what?

  13. Background + signal describe EGRET data! by W. de Boer etal.

  14. Summary from W. De Boer 10σ EGRET excess shows all key features from DM annihilation: Excess has same shape in all sky directions: everywhere it is perfectly (only?) explainable with superposition of background AND mono-energetic quarks of 50-100 GeV Results consistent with minimal SUPERSYMMETRY Excess follows expectations from galaxy formation: cored 1/r2 profile with substructure, visible matter/DM0.02 Significance >10σ with >1400 indep. data points Excess is TRACER OF DM, since it can explain peculiar shape of rotation curve Results model independent, since only KNOWN spectral shapes of signal and background used, NO model dependent calculations of absolute fluxes. Conventional models CANNOT explain above points SIMULTANEOUSLY, especially spectrum of gamma rays in all directions, shape of rotation curve, stability of ring of stars at 14 kpc and ring of H2 at 4 kpc.,..

  15. In other words: Mono-energetic quarks (50-100 GeV)

  16. Invisible Higgs decay: H->SS

  17. Invisible Higgs decay: H->SS

  18. II: Detecting light invisible Higgs Boson via pp->ZH mode

  19. Why ZH channel? • ZH is similar to Zhu (thank you, F. Lu!) • ZH tends to have SM-like coupling • Z can be excellently reconstructed via charged lepton pair

  20. My contributions

  21. Summary • Seems everything is perfect: Higgs mass bounds can predict scalar CDM value and EGRET prefers the same mass region. • The Higgs boson is light and may decay dominantly into DM. We are listening what LHC/ILC will tell us!

  22. Thanks for your attention!

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