Super WIMP Dark matter in SUSY with a

Super. WIMP Dark matter in SUSY with a Gravitino LSP Shufang Su • U. of Arizona See also, Jonathan Feng’s talk, Super. WIMPs and Slepton Traps S. Su SWIMP J. Feng, F. Takayama, S. Su hep-ph/0404198, 0404231

Why is the gravitino not usually considered as DM? In supergravity, for m. G~ » Ge. V – Te. V th. G~ v -1 (gravitional coupling)-2 (comparig to WIMP of weak coupling strength) ● v too small ● th. G~ too big, overclose the Universe However, gravitino can get relic density by other means Super. WIMP S. Su SWIMP 2

WIMP SWIMP + SM particle FRT hep-ph/0302215, 0306024 WIMP 104 s t 108 s SWIMP SM Gravitino LSP LKK graviton 106 S. Su SWIMP 3

Outline SWIMP dark matter and gravitino LSP Constraints - Late time energy injection and BBN NLSP gravitino +SM particle slepton, sneutrino, neutralino - approach I: fix SWIMP=0. 23 - approach II: SWIMP=(m. SWIMP/m. NLSP) th. NLSP Collider phenomenology Conclusion Updates since Jan SLAC LC workshop S. Su SWIMP 4

SWIMP and SUSY WIMP · SUSY case ~ (LSP) SWIMP: G WIMP: NLSP m~G » m. NLSP Ellis et. al. , hep-ph/0312262; Wang and Yang, hep-ph/0405186. 104 s t 108 s BBN ~ NLSP G + SM particles neutralino/chargino NLSP slepton/sneutrino NLSP Brhad O(0. 01) Brhad O(10 -3) EM had S. Su SWIMP 5

Constraints ~ NLSP G + SM particles /10 -10 = 6. 1 0. 4 Dark matter density ~G · 0. 23 - approach I: fix SWIMP=0. 23 - approach II: SWIMP=(m. SWIMP/m. NLSP) th. NLSP CMB photon energy distribution Big bang nucleosynthesis Late time EM/had injection could change the BBN prediction of light elements abundances Fields, Sarkar, PDG (2002) S. Su SWIMP 6

BBN constraints on EM/had injection · Decay lifetime NLSP · EM/had energy release had EM (Ge. V) » m. NLSP-m. G~ EM, had= EM, had Br. EM, had YNLSP EM Cyburt, Ellis, Fields and Olive, PRD 67, 103521 (2003) Kawasaki, Kohri and Moroi, astro-ph/0402490 S. Su SWIMP 7

YNLSP: approach I · approach I: fix G~ = 0. 23 200 Ge. V · m · 400 » 1500 Ge. V , EM, had= EM, had BEM, had m. G~ ¸ NLSP 200 Ge. V slepton and sneutrino YNLSP m · 80 » 300 Ge. V apply CMB and BBN constraints on ( NLSP, EM/had ) viable parameter space S. Su SWIMP 8

Approach II: slepton and sneutrino G~ = (m~G/m. NLSP) th. NLSP S. Su SWIMP 9

Collider Phenomenology SWIMP Dark Matter ´ no signals in direct / indirect dark matter searches ü SUSY NLSP: rich collider phenomenology NLSP in SWIMP: long lifetime stable inside the detector · Charged slepton highly ionizing track, almost background free Distinguish from stau NLSP and gravitino LSP in GMSB · GMSB: gravitino m » ke. V warm not cold DM · collider searches: other sparticle (mass) · (GMSB) ¿ (SWIMP): distinguish experimentally Feng and Smith, in preparation. S. Su SWIMP 10

Sneutrino and neutralino NLSP · sneutrino and neutralino NLSP missing energy signal: energetic jets/leptons + missing energy Is the lightest SM superpartner sneutrino or neutralino? - angular distribution of events (LC) vs. Does it decay into gravitino or not? - sneutrino case: most likely gravitino is LSP - neutralino case: most likely neutralino LSP § direct/indirect dark matter search positive detection disfavor gravitino LSP § precision determination of SUSY parameter: th~ , ~ 0. 23 favor gravitino LSP S. Su SWIMP 11

● Decay life time ● SM energy distribution Mpl m. G~ SM NLSP ~ G SM NLSP SUSY breaking scale SM NLSP ~ G Capture particle: Goity, Kossler and Sher, hep-ph/9305244 Supergravity at colliders Buchmuller et. al. hep-ph/0402179 SWIMPs and slepton traps Feng and Smith In preparation… See Feng’s talk S. Su SWIMP 12

Conclusions • Super. WIMP is possible candidate for dark matter • SUSY models SWIMP: gravitino LSP WIMP: slepton/sneutrino/neutralino Constraints from BBN: EM injection and hadronic injection need updated studies of BBN constraints on hadronic/EM injection • Favored mass region - Approach I: fix ~G=0. 23 Approach II: G~ = (m. G~/m. NLSP) th. NLSP • Rich collider phenomenology (no direct/indirect DM signal) - charged slepton: highly ionizing track sneutrino/neutralino: missing energy - Other implications … S. Su SWIMP 13