The Matters of Dark Matters Ernestas Pukartas Lancaster University - PowerPoint PPT Presentation

Jun 27, 2023 •317 likes •463 views

The Matters of Dark Matters Ernestas Pukartas Lancaster University based on arXiv:1303.5386, JHEP 1306 , 113 (2013): C. Boehm, B. Dev, A. Mazumdar, E.P. Outline How do we know DM exists? Experimental signals of light DM. How to get

The Matters of Dark Matters Ernestas Pukartas Lancaster University based on arXiv:1303.5386, JHEP 1306 , 113 (2013): C. Boehm, B. Dev, A. Mazumdar, E.P.
Outline ✔ How do we know DM exists? ✔ Experimental signals of light DM. ✔ How to get light DM in SUSY models? ✔ Scan setup and results. ✔ Naturalness issues. ✔ Conclusion.
Evidence and origin of DM Galaxy's/cluster's rotation curves Gravitational lensing Bullet cluster-evidence for a Energy budget of the Universe. particle-like origin of DM.
Signals of light DM DAMA/LIBRA observed annual modulation at 8.9 σ . CoGeNT supports annual modulation detected by DAMA/LIBRA. -Favours 7-11 GeV DM. CRESST-II likelihood analysis best fit gives: CDMS highest likelihood at 8.6 GeV.
How people look at it Pessimists: things can not get any worse... -DAMA/LIBRA, CoGeNT, CRESST-II, CDMSII Optimists: of course they can!!! -XENON100, EDELWEISS II Fig. from Scopel's talk. Opportunists: -try to reconcile the data and theory. -try to rule in/out particle physics models.
Dark Matter in MSSM
How to get light DM?
Parametrising the fine tuning Ellis, Enqvist, Nanopoulos, Zwirner: Mod. Phys. Lett. A1 (1986) 57 Barbieri and Guidice: Nucl.Phys. B306 (1988) 63
Constraints imposed ● Dark matter abundance from WMAP & Planck. ● Cold DM particle ● LEP bound on a mass of chargino. ● Higgsteria: Higgs mass constraint from ATLAS & CMS and the Duck test: If it looks like a duck, swims like a duck, and quacks like a duck, then it probably is a duck. ● Branching ratios: ● ● Invisible Z boson decay for neutralinos with masses
SM SM SM Z SM
Arkani-Hamed, Delgado, Guidice: hep-ph/0601041
DD and ID probes ● No worries for ID but DD is biting a lot! ● pMSSM has potential to explain CRESST – II but not DAMA, CoGeNT or CDMS-II.
Conclusions “What?” vs “So What?”
Lightest neutralino must be dominantly bino ● Bound on chargino mass. ● Invisible Z decay:

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