Aspects of dark matter in gaugemediated SUSY breaking
Aspects of dark matter in gauge-mediated SUSY breaking scenario with extended Higgs sector Masato Yamanaka (ICRR, University of Tokyo) Collaborators Junji Hisano, Kazunori Nakayama Shohei Sugiyama, Tomohiro Takesako
Introduction Attractive SUSY breaking scenario Gauge-Mediated SUSY Breaking (GMSB) SUSY flavor problem SUSY CP problem Dark matter problem ✓ ✓ ✓? ? ?
Introduction Shortcomings from the view point of dark matter Gravitino problem Constraint on reheating temperature [M. ~Kawasaki, K. ~Kohri and T. ~Moroi, PRD 71, 2005] Inconsistent with direct detection experiment Motivation Gauge-mediated SUSY breaking scenario free from cosmological problems [The CDMS-II Collaboration, ar. Xiv: 0912. 3592]
Model Key point of our scenario Introduction of extra chiral supermultiplet Fundamental rep. of SU(2) (H’, H’) Fundamental rep. of SU(3) (H’c , H’c ) Extra Z 2 -parity SM particles even Extra particles odd WIMP dark matter : Lightest extra particle
Model Key point of our scenario Introduction of Extra chiral supermultiplet Fundamental rep. of SU(2) (H’, H’) Fundamental rep. of SU(3) (H’c , H’c ) Singlet scalar s’ Dark matter : mixing state of H’, H, and s’ Suppression of vector coupling with nucleon
Model Superpotential Soft SUSY breaking term
Model Identification of dark matter and its mass
Direct detection of dark matter Cross section Connection between elemental int. and DM-nucleon int. Effective coupling between neutralino and nucleon : h 0(H 0 ) - q Yukawa coupling : h 0(H 0 ) -c - c coupling
Direct detection of dark matter Cross section Connection between elemental int. and DM-nucleon int. Effective coupling between dark matter and nucleon : Mass diagonalizing matrix
Direct detection of dark matter Fermionic dark matter bosonic dark matter
Direct detection of dark matter Parameter space for reproducing CDMS II result
Collider signatures For the confirmation of our model Discovery of extra Higgs bosons and its superpartner Lighter extra Higgsino ~0 H’L (dark matter) Heavier extra Higgsino ~ 0 ~± H’H , H’H
Collider signatures Integrated luminosity 100 fb-1 Discovery at 5 s level for m ~H’ 0 H = m ~H’ ± H < 220 Ge. V
Collider signatures Long lived particle ~ : Colored extra Higgsino H’C Suppressed decay ope. Hadronization into charged particle Observable for determination m ~ H’C ∴
Summary We have proposed a new model with extended Higgs sector in gauge-mediated SUSY breaking scenario Extra Higgs boson or its superpartner play a role of WIMP dark matter in our model We have predicted the direct detection rate of dark matter in our model It is possible to reproduce CDMS II events We have discussed the confirmation of our model at the LHC Extra Higgsinos could be discovered at 5 s level when they are lighter than 220 Ge. V
Appendix
Direct detection of dark matter Cross section Connection between elemental int. and DM-nucleon int. Quark density in a nucleon from experiments and Lattice simulation
- Slides: 18